JP2003043007A - Electrochemical water quality measuring instrument and water treatment plant equipped therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrochemical water quality measuring instrument that has a water quality detecting means composed of a reference electrode and a working electrode and can accurately measure aimed water quality information, even when the potential at the reference electrode changes due to the fluctuation of the ambient temperature, and to provide a water treatment plant provided with the instrument. SOLUTION: The electrochemical water quality measuring instrument 1 having the water quality detecting means composed of the reference electrode 2a and working electrode 2b is provided with a liquid temperature measuring means which measures the temperature of a liquid 15 to be measured. The instrument 1 is also provided with an ambient temperature measuring means which measures the ambient temperature of the water quality detecting means, and a correcting means which corrects the water quality information detected by means of the detecting means based on the temperature of the liquid 15 measured by means of the liquid temperature measuring means and the ambient temperature measured by means of the ambient temperature measuring means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrochemical water quality measuring device for accurately detecting desired water quality information and a water treatment device equipped with the same.

[0002]

2. Description of the Related Art As a general electrochemical water quality detecting means, one having a change in electrode potential due to a specific change in water quality such as an ion selective electrode such as a pH electrode or a calcium ion electrode as a working electrode is used. In addition to the above, there is a reference electrode having a known electrode potential such as a silver / silver chloride electrode. In this case, by detecting the electromotive force generated between the electrodes, pH, various ion concentrations, etc.
A particular water quality is to be measured.

At this time, the electrode potentials of the working electrode and the reference electrode change according to the ion concentration according to the following Nernst equation.

E = E ₀ + 2.303 × R × T ÷ (n ×
F) × log (a) E: Electrode potential E ₀ : Standard electrode potential R: Gas constant T: Absolute temperature n: Charge number of ions F: Faraday constant a: Ion concentration The electrode potential of such a working electrode is E1, When the electrode potential of the comparison electrode is E2, the electromotive force V between the electrodes is as follows, and the ion concentration and the like can be measured based on this electromotive force.

V = E1−E2 Since the Nernst equation is a function of temperature as described above, the electrode potential varies depending on the temperature of the liquid (measurement liquid) to be measured even if the ion concentration is the same. Change occurs. For this reason, it is general that the temperature of the liquid to be measured is detected and corrected by a temperature measuring means such as a thermistor, or the liquid temperature is fixed in advance and the measurement is performed without being affected by the liquid temperature. Is.

[0006]

However, as described above, even if the liquid temperature of the liquid to be measured is detected and corrected by the temperature measuring means such as the thermistor, or the liquid temperature is previously fixed and measured,
Similarly to the working electrode, the electrode potential of the reference electrode also changes depending on the temperature. FIG. 11 shows the temperature dependence of a silver / silver chloride electrode generally used as a reference electrode.

Here, the reference electrode is constructed by arranging the internal electrode in a container in which the internal electrolytic solution is sealed and by providing a liquid junction part in this container, and immersing only the liquid junction part in the liquid to be measured. Therefore, the temperature of the reference electrode is hardly affected by the temperature of the liquid to be measured, and the temperature of the internal electrolyte is the ambient temperature. If there is a difference between the liquid temperature of the liquid to be measured and the ambient temperature, the comparison electrode will show the electrode potential at the ambient temperature. After that, the temperature of the internal electrolyte gradually approaches the liquid temperature of the liquid to be measured, but it takes 3 to 5 minutes until the temperature of the internal electrolyte becomes the same as the liquid temperature of the liquid to be measured. On the other hand, since the normal measurement time of water quality is assumed to be 1 minute, the reference electrode shows the electrode potential at the ambient temperature during the measurement of water quality.

In particular, when a thickening agent such as carboxymethyl cellulose is mixed in the internal electrolytic solution in order to suppress or stabilize the outflow amount of the internal electrolytic solution, the heat capacity of the internal electrolytic solution becomes large, so The temperature of the liquid is kept at the ambient temperature.

As described above, the electrode potential of the reference electrode changes depending on the ambient temperature around the reference electrode. Therefore, the liquid temperature of the liquid to be measured can be measured and the liquid temperature can be measured. Accurate measurement of water quality was not possible only by keeping constant.

The present invention has been made in view of the above points, and has a water quality detecting means consisting of a reference electrode and a working electrode, and has an object even when the electrode potential of the reference electrode changes due to a change in atmospheric temperature. It is an object of the present invention to provide an electrochemical water quality measuring device capable of accurately measuring water quality information and a water treatment device including the same.

[0011]

An electrochemical water quality measuring device according to claim 1 of the present invention comprises a reference electrode 2a and a working electrode 2b.
Electrochemical water quality measuring instrument 1 having water quality detecting means
In, the liquid temperature measuring means for measuring the liquid temperature of the liquid to be measured 15, the atmosphere temperature measuring means for measuring the temperature of the atmosphere in which the water quality detecting means is arranged, the liquid temperature measured by the liquid temperature measuring means, and It is characterized by comprising a correction means for correcting the water quality information detected by the water quality detection means on the basis of the atmosphere temperature measured by the atmosphere temperature measurement means.

According to a second aspect of the invention, in the first aspect, the atmospheric temperature measuring means is arranged in the vicinity of the water quality detecting means without contacting the water quality detecting means.

A third aspect of the present invention is characterized in that, in the first or second aspect, a heat insulating material 16 is interposed between the ambient temperature measuring means and the water quality detecting means.

Further, the invention of claim 4 is the state in which the water quality can be measured by the temperature measuring means which also functions as the liquid temperature measuring means and the ambient temperature measuring means, and the water quality detecting means. The temperature measuring means detects when the measuring solution detecting means detects that the water quality can be measured by the water quality detecting means. Using the temperature information as the liquid temperature information and using the temperature information detected by the temperature measuring means as the atmosphere information when the measured liquid detecting means detects that the water quality cannot be measured by the water quality detecting means, the water quality It is characterized by correcting information.

According to a fifth aspect of the invention, in the fourth aspect, the measurement liquid detecting means detects two electrodes facing each other, a voltage generator for applying a voltage to the electrodes, and an energization detecting for energizing between the electrodes. The water quality detecting means is configured to detect whether or not the water quality can be measured by the presence / absence of energization between the electrodes.

Further, the invention of claim 6 is characterized in that, in claim 4, the measurement liquid detecting means is an electric conductivity meter.

The invention according to claim 7 is the float according to claim 4, wherein the measuring liquid detecting means is lifted by buoyancy when the measuring liquid detecting means is arranged in the liquid to be measured 15, and the position where the float is arranged is more than a predetermined position. It is characterized in that it is a float switch composed of a switch that emits a signal when it is above.

Further, the invention of claim 8 is characterized in that, in claim 4, the measuring liquid detecting means is a weight switch for detecting a load applied from the liquid to be measured 15.

According to a ninth aspect of the invention, in the fourth aspect, the water quality detecting means is provided also as the measuring liquid detecting means, and when the detection result of the water quality information is within a predetermined range, the water quality detecting means operates. Characterized by detecting that the water quality can be measured, and detecting that the water quality cannot be measured by the water quality detecting means when the detection result of the water quality information is out of a predetermined range. Is.

Further, the invention of claim 10 is based on claims 4 to 9.
In any one of the above, the correction means detects a plurality of ambient temperature information detected by the temperature measurement means when the measurement liquid detection means detects that the water quality cannot be measured by the water quality detection means, and Water quality information based on the liquid temperature information detected by the temperature measurement means when the measurement liquid detection means detects that the water quality can be measured by the water quality detection means after the ambient temperature information is detected. It is characterized in that the correction is performed.

Further, the invention of claim 11 is based on claims 4 to 1.
In any one of 0, the correction unit changes the temperature after a lapse of a fixed time after the detection result of the measurement liquid detection unit changes from the state in which the water quality can be measured by the water quality detection unit to the state in which the water quality cannot be measured by the water quality detection unit. The water quality information is corrected based on the ambient temperature information detected by the measuring means.

According to a twelfth aspect of the invention, in the eleventh aspect, the correction means and the detection result of the measurement liquid detection means are:
After changing from a state in which the water quality can be measured by the water quality detecting means to a state in which the water quality cannot be measured by the water quality detecting means, when the water quality changes by the water quality detecting means before the elapse of a certain time, It is characterized in that the water quality information is corrected on the basis of the ambient temperature information used for correcting the water quality information in the state where the water quality can be measured by the previous water quality detection means.

The invention of claim 13 is characterized in that, in any one of claims 10 to 12, the correction means corrects the water quality information based on an average value of a plurality of atmosphere temperature information. To do.

The invention according to claim 14 is the method according to any one of claims 10 to 12, wherein the correcting means estimates the ambient temperature at the time of detecting the water quality information by the water quality detecting means, which is estimated from the time-dependent change of the plurality of ambient temperature information. It is characterized in that the water quality information is corrected based on the above.

A water treatment apparatus according to a fifteenth aspect of the present invention is a water treatment apparatus 8 comprising a flow passage extending from an inflow port to an outflow port, and a water treatment unit 9 for treating raw water flowing through this flow channel. The electrochemical water quality measuring device 1 according to any one of claims 1 to 14 is provided as a water quality measuring device for measuring the quality of water flowing through the flow path. .

The water treatment apparatus according to claim 16 of the present invention is the water treatment apparatus 8 comprising a flow path from the inflow port to the outflow port, and a water processing unit 9 for processing the raw water flowing through the flow path. The electrochemical water quality measuring device 1 according to any one of claims 4 to 14 is provided as a water quality measuring device for measuring the quality of water flowing through the flow passage, In a state where water is not supplied, at least a drainage means for draining water in a region in the flow path where water quality is measured by the electrochemical water quality measuring instrument 1 is provided.

According to a seventeenth aspect of the present invention, in the sixteenth aspect, as the measurement liquid detecting means, there is provided a valve element which is disposed in the flow channel and is movable in a flow direction of water in the flow channel, and a valve element. A pressure sensor including an elastic body that urges the valve body toward the upstream side of the flow path and a sensing unit that detects whether or not the valve body is moving is provided. When it is detected that the valve body has moved toward the downstream side of the flow path against the biasing force of the elastic body, it is determined that the water quality can be measured by the water quality detection means, and the sensing unit When the movement of the valve body is not detected, the water quality detection means determines that the water quality cannot be measured.

According to the eighteenth aspect of the present invention, in the sixteenth aspect, a flow rate sensor whose output value changes depending on the flow rate of water in the flow path is provided as the measurement liquid detecting means, and the correcting means determines the output value of the flow rate sensor. When the water quality is above a certain level, it is judged that the water quality can be measured by the water quality detection means, and when the output value from the flow sensor is less than a certain value, it is judged that the water quality cannot be measured by the water quality detection means. It is characterized by being

According to a nineteenth aspect of the present invention, in the sixteenth aspect, the water treatment section 9 is an electrolytic cell 9 for subjecting raw water to an electrolytic treatment.
a is provided, and an ammeter for detecting the presence or absence of energization of electrolytic current is provided in the electrolytic cell 9a to form a measuring liquid detecting means.
The correction means determines that the water quality can be measured by the water quality detection means when the passage of the electrolysis current is detected, and the water quality cannot be measured by the water quality detection means when the passage of the electrolysis current is not detected. It is characterized in that it is determined to be present.

According to a twentieth aspect of the present invention, in the sixteenth aspect, as the measurement liquid detecting means, a means for measuring the water quality of the water after being treated in the water treatment section is provided, and the correcting means is the measurement liquid detecting means. If there is a change in the water quality measurement result, it is determined that the water quality can be measured by the water quality detection means, and if there is no change in the water quality measurement result, the water quality cannot be measured by the water quality detection means. It is characterized in that it is determined to be present.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

FIG. 1 shows a first embodiment. This electrochemical water quality measuring instrument 1 includes a water quality detecting section 2 (water quality detecting means) for detecting desired water quality information and a liquid temperature measuring section 3 (liquid temperature measuring means) for measuring the liquid temperature of the measured liquid 15. And an atmosphere temperature measuring section 4 (atmosphere temperature measuring means) for measuring the temperature of the atmosphere around the water quality detecting section 2 and a correcting section 5 (correcting means).

The water quality information referred to herein means information that depends on a specific one of a plurality of elements (water quality elements) such as the concentration, physical properties, temperature, etc. of the dissolved substances constituting the water quality.

In the present invention, the water quality detection unit 2 includes the working electrode 2 in which the electrode potential changes according to the desired change in the water quality information.
a and a reference electrode 2b having a known electrode potential, and outputs information on electromotive force generated between the working electrode 2a and the reference electrode 2b as water quality information.

As the working electrode 2a, various ones depending on the water quality element to be measured by the electrochemical water quality measuring device 1 can be used. For example, when measuring the pH of the liquid 15 to be measured, a glass sensitive material is used. A membrane electrode or the like can be used.

FIG. 8 shows an example of the comparison electrode 2b. The reference electrode 2b is provided in the container 18 with an internal electrolyte solution 20.
And an internal electrode 19 immersed in the internal electrolytic solution 20 are arranged, and a liquid junction portion 21 made of porous ceramic or the like is formed in the lower portion of the container 18. As such a comparison electrode 2b, for example, a saturated potassium chloride solution may be used as the internal electrolyte solution 20, and a silver / silver chloride electrode having a silver electrode may be used as the internal electrode 19.
In the figure, 17 is a cap for sealing the container 18, 16 is a conductive wire connected to the internal electrode, and 22 is a replenishment port for replenishing the internal electrolyte solution 20 in the container 18.

In this water quality detection unit 2, the sensitive portion of the working electrode 2a (the glass sensitive film in the case of a glass electrode) is the liquid to be measured 1.
5, the liquid junction 21 of the reference electrode 2b also outputs information on electromotive force generated by being immersed in the measured liquid 15 as water quality information.

The liquid temperature measuring unit 3 and the ambient temperature measuring unit 4 are composed of a temperature measuring device such as a thermistor. The liquid temperature of the liquid to be measured 15 and the ambient temperature around the water quality detecting unit 2 are measured. Is to detect.

The liquid temperature measuring unit 3 is in a state in which the water quality detecting unit 2 can detect the water quality information of the liquid to be measured 15, that is, in this embodiment, the sensitive portion of the working electrode 2a and the liquid junction of the comparison electrode 2b. The temperature of the measured liquid 15 is detected in a state where 21 is immersed in the measured liquid 15. For example, the sensitive part of the working electrode 2a and the reference electrode 2b are detected.
The liquid junction portion 21 and the temperature detecting portion of the liquid temperature measuring portion 3 are arranged at the same height so that they are simultaneously immersed in the liquid 15 to be measured. In the state where the part and the liquid junction 21 of the reference electrode 2b are immersed in the liquid to be measured 15, the temperature detection part of the liquid temperature measuring unit 3 is also the liquid to be measured 15.
Be immersed in it.

The ambient temperature measuring unit 4 measures the temperature of the water quality detecting unit 2, especially the ambient atmosphere of the comparison electrode 2b in which the liquid to be measured 15 does not exist. For example, the sensitive portion of the working electrode 2a, By disposing the temperature detecting part of the ambient temperature measuring part 4 above the position where the liquid junction 21 of the comparison electrode 2b is arranged, the liquid junction between the sensitive part of the working electrode 2a and the comparison electrode 2b is arranged. Even when the portion 21 is immersed in the liquid to be measured 15, the temperature detection portion of the ambient temperature measuring unit 4 is prevented from being immersed in the liquid to be measured 15.

Further, the correction unit 5 includes the water quality information detected by the water quality detection unit 2, the liquid temperature information detected by the liquid temperature measurement unit 3, and the atmosphere temperature information detected by the atmosphere temperature measurement unit 4. Is input, and the water quality information is corrected from these pieces of information to output more accurate water quality information.

The correction unit 5 includes a water quality detection unit 2 and a liquid temperature measurement unit 3.
A storage means for inputting the detection result from the ambient temperature measuring section 4 and temporarily storing the detection result, a water quality detecting section 2, a liquid temperature measuring section 3, and an ambient temperature measuring section stored in the storage section. Based on the detection result from 4, the water quality detection unit 2
The correction calculation unit 5a may include a calculation unit that corrects the detection result obtained by (1) and an output unit that outputs the corrected detection result by the water quality detection unit 2.

As the correction calculating section 5a, the above calculating means may be provided to correct the detection result of the water quality detecting section 2 according to the correction formula or the correction table.

When the correction formula is used here, the calculation means of the correction calculation section 5a is a computer such as a CPU which is composed of a storage medium storing a computer program and an arithmetic circuit for performing the calculation according to the computer program. It can be configured by providing a logic circuit or the like for performing a certain arithmetic processing.

In the case of using the correction table, the calculation means of the correction calculation section 5a includes a storage means (correction storage means) in which the correction table is stored, a storage medium in which the computer program is stored, and a correction according to the computer program. It can be configured by a computer such as a CPU including an arithmetic circuit that performs arithmetic while referring to a table.

In the electrochemical water quality measuring device 1 configured as described above, the electrode potential of the reference electrode 2b which changes depending on the ambient temperature can be corrected, so that the pH of the target liquid can be more accurately measured. Can be measured.

An example of the correction operation of the detection result of the water quality detection unit 2 in the correction calculation unit 5a in the above-described device configuration will be described.

In the example shown here, the electromotive force detected by the water quality detection unit 2 is calculated by using the correction equation, and the temperature of the measured liquid 15 and the temperature of the internal electrolyte 20 of the comparison electrode 2a (ambient temperature) are calculated. It is converted into electromotive force at a predetermined temperature (25 ° C), and water quality information (p
H) is derived.

Here, first, the pH of the liquid to be measured 15 is 2 to
Assuming that it is in the range of 12, the intermediate value of pH 7 is used as the reference for concentration correction. In this case, the electromotive force measurement result at the water quality detection unit 2 when the liquid temperature and the ambient temperature are both 25 degrees Celsius, and the electromotive force measurement result at the liquid temperature centigrade t ° C. and the ambient temperature T ° C. are respectively V _{25 _25} , If V _{t —T} , each electromotive force is expressed by the following equation.

V _{25 _25} = E1 ₂₅ _25 _-E2 25 _{_25} V _{t _T} = E1 _t _T _{-E2 t} _T _At this time, the electrode potentials E1 _{25 _25} , E1 _{t _T} of the working electrode 2a.
Is as follows.

[0051] _{E1 25_25 = E1 0 - (54.2} + 0.2 × 25) × 7 E1 t_T = E1 0 - (54.2 + 0.2 × t) × 7 The electrode potential of the reference electrode 2b is target solution The electrode potentials E2 _{25_25} and E2 _{t_T} of the _reference electrode 2b do not depend on the liquid temperature of 15 and indicate the ambient temperature.
E2 _{x — 25} and E2 _{x — T,} which are the electrode potentials in _E.g., and _assuming that the comparison electrode 2b is a silver / silver chloride electrode, regression analysis of the graph shown in FIG.
_{25_25} and E2 _{t_T} are as follows.

E2 ₂₅ — ₂₅ = E2 _{x —25} = 222.3 E2 _{t_T} = E2 _{x_T} = 191.1 + 0.86 × T−0.0
025 × T ² By rearranging these equations, the first correction equation for deriving the difference ΔV between V _{25 — 25} and V _{t —} T is obtained.

ΔV = V _{t —T} −V ₂₅ — 25 = −31.1 + 0.
86 × T−0.0025 × T ² −1.4 × (t−25) In the correction unit 5, the liquid temperature measurement unit 3 is calculated by the first correction formula.
The correction value ΔV of the electromotive force is derived from the liquid temperature t ° C. detected by the ambient temperature measuring unit 4 and the ambient temperature T ° detected by the ambient temperature measuring unit 4, and the liquid detected by the water quality detecting unit 2 Temperature t
The electromotive force _{Vt_T} at the temperature of 25 ° C. and the ambient temperature of T ° C. is ₂₅ ° C. by the following second correction equation using this correction value ΔV.
It is corrected to the electromotive force V ′ at the temperature of 25 ° C. and the ambient temperature of 25 ° C.

V ′ = V ₂₅ — ₂₅ = V _{t —T} −ΔV Since the corrected electromotive force V ′ and the pH of the solution to be measured have a one-to-one correspondence, the above first and second correction equations are used. An accurate pH of the liquid to be measured is derived from the obtained electromotive force V '.

Next, as the correction calculation unit 5a, a unit for correcting the detection result of the water quality detection unit 2 according to the correction table will be described. In this example, instead of ΔV in the above equation, a value specified for each predetermined liquid temperature range and ambient temperature range in the correction table is used as ΔV, and the pH is derived by this. In such a correction table, for example, as shown in Table 1 below, the range of the liquid temperature and the ambient temperature detected by the liquid temperature detection unit 3 and the ambient temperature detection unit 4 respectively correspond to the value of the correction value ΔV. The attached one can be used.

[0056]

[Table 1]

When the water quality information of the measured liquid 15 is measured by the electrochemical water quality measuring device 1 in this embodiment, the sensitive portion of the working electrode 2a and the liquid junction 21 of the reference electrode 2b are connected to the measured liquid 15. The electrochemical water quality measuring device 1 is arranged with respect to the container 14 such that it is arranged in a container 14 such as a beaker to which the water is supplied, or the sensitive part of the working electrode 2a and the liquid junction 21 of the reference electrode 2b are covered. The electrochemical water quality measuring device 1 is arranged with respect to the flow channel so that it is arranged in the flow channel through which the measurement liquid 15 flows. In the illustrated example, the electrochemical water quality measuring device 1 is
It is arranged above the container 14 to which the liquid to be measured 15 is supplied, and the sensitive portion of the working electrode 2a and the liquid junction 21 of the comparison electrode 2b are immersed in the liquid to be measured 15 in the container 14. At this time, the liquid temperature measuring unit 3 is also arranged in the container 14 or the liquid to be measured 15 in the channel, and the ambient temperature measuring unit 4 is not arranged in the container 14 or the channel.
Then, by supplying the measured liquid 15 into the container 14 or circulating the measured liquid 15 in the flow path, the working electrode 2a
The sensitive part of the liquid and the liquid junction 21 of the reference electrode 2b to the measured liquid 15
It is immersed in the inside, and in this state, the ambient temperature measuring unit 4 measures the ambient temperature, the liquid temperature measuring unit 3 measures the liquid temperature, and the water quality measuring device 2 measures the water quality information. Based on the ambient temperature information and the liquid temperature detection information, the correction unit 5 corrects the water quality information by the water quality detection unit 2 to derive an accurate measurement result of the water quality.

FIG. 2 shows a second embodiment. In this embodiment, the ambient temperature measuring unit 4 in the first embodiment is arranged as close as possible without coming into contact with the comparison electrode 2b of the water quality detecting unit 2.

That is, the present invention corrects the detection error of the water quality information due to the change of the electrode potential of the comparison electrode 2b due to the influence of the ambient temperature. Is preferably performed in the vicinity of. Further, when the liquid junction 21 of the comparison electrode 2b is immersed in the measured liquid 15, the temperature of the entire electrode system of the comparison electrode 2b is not easily influenced by the temperature of the measured liquid 15, but the temperature of the comparison electrode 2b is small. Since the temperature of the container 18 constituting the outer package is likely to change depending on the temperature of the liquid to be measured 15, the ambient temperature measuring unit 4 should not come into contact with the reference electrode 2b so as not to detect the temperature of the outer portion of the reference electrode 2b. Is to be installed in.

By doing so, it is possible to more accurately measure the ambient temperature around the reference electrode 2b by the ambient temperature measuring unit 4 and to more accurately measure the water quality information.

FIG. 3 shows a third embodiment. In the present embodiment, the heat insulating material 16 is interposed between the atmosphere temperature measuring unit 4 and the comparison electrode 2b of the water quality detection unit 2, and the comparison electrode 2b is provided.
And the heat insulating material 16 are brought into close contact with each other, and the heat insulating material 16 and the ambient temperature measuring part 4 are brought into close contact with each other.

In this way, the ambient temperature measuring unit 4 can be easily arranged close to the reference electrode 2b of the water quality detecting unit 2 without directly contacting the reference electrode 2b. Even if the temperature of the container 18 forming the exterior of the reference electrode 2b changes when the liquid junction 21 of the reference electrode 2b contacts the measured liquid 15, this temperature change is caused by the heat insulating material 16. It is possible to accurately measure the ambient temperature around the water quality detection unit 2 without affecting the measurement result in 4.

4 and 5 show a fourth embodiment.
In the present embodiment, it is detected whether or not the water temperature information can be detected by the temperature measuring unit 6 that also functions as the liquid temperature measuring unit 3 and the ambient temperature measuring unit 4 in each of the above embodiments, and the water quality detecting unit 2. The measuring liquid detecting section 7 is provided.

The temperature measuring unit 6 can be composed of a temperature measuring device such as a thermistor. Also, this temperature measuring unit 6
Is the state in which the water quality information can be detected by the water quality detection unit 2, that is, in the present embodiment, in the state in which the sensitive portion of the working electrode 2a and the liquid junction portion 21 of the comparison electrode 2b are immersed in the measured liquid 15. The temperature of the measurement liquid 15 is detected. For example, the sensitive portion of the working electrode 2a, the liquid junction portion 21 of the comparison electrode 2b, and the temperature detection portion of the temperature measuring portion 6 are arranged at the same height. In the state where the sensitive part of the working electrode 2a and the liquid junction part 21 of the comparison electrode 2b are immersed in the liquid to be measured 15, the temperature detection part of the temperature measuring part 6 is also immersed in the liquid to be measured 15. . In the temperature measuring unit 6, the water quality detecting unit 2 cannot detect water quality information, that is, in the present embodiment, the sensitive portion of the working electrode 2a and the liquid junction portion 21 of the comparison electrode 2b are not immersed in the measured liquid 15. In the state, the liquid to be measured 1 of the water quality detection unit 2, especially the comparison electrode 2b
5 is for measuring the temperature of the ambient atmosphere in which the water is not present. Therefore, it is preferable that the reference electrode 2b of the water quality detection unit 2 be used.
It is arranged as close as possible without being in contact with.

Further, the measurement liquid detecting section 7 is in a state in which the water quality information can be detected by the water quality detecting section 2, that is, in the present embodiment, the sensitive portion of the working electrode 2a and the liquid junction portion 21 of the comparison electrode 2b are connected to the measurement liquid 15. The state of being immersed and the state in which water quality information cannot be detected by the water quality detecting section 2, that is, in the present embodiment, the sensitive portion of the working electrode 2a and the liquid junction portion 21 of the comparison electrode 2b are not immersed in the measured liquid 15. The state is detected, and an appropriate configuration as described later can be used.

Further, as the correction unit 5, the measurement liquid determination unit 5
What has b is used. The detection information from the measurement liquid detection unit 7 is input to the measurement liquid determination unit 5b, and it is determined whether or not the water quality detection unit 2 can detect the water quality information based on the detection information. When it is determined that the temperature can be detected, the correction unit 5 stores the information input from the temperature measurement unit 6 in the storage unit as the liquid temperature information. When the measurement liquid determination unit 5b determines that the water quality detection unit 2 cannot detect the water quality information, the correction unit 5 stores the information input from the temperature measurement unit 6 in the storage unit as the ambient temperature information. To do. Then, as in the case described above, the correction unit 5 performs the correction operation of the water quality information detected by the water quality detection unit 2 based on the atmosphere temperature information and the liquid temperature information.

When the water quality information of the measured liquid 15 is measured by the electrochemical water quality measuring device 1 in this embodiment, first, as shown in FIG. 5, the measured liquid 15 is not supplied into the container 14. Alternatively, the liquid to be measured 15 is not allowed to flow through the flow path so that the sensitive portion of the working electrode 2a and the liquid junction 21 of the reference electrode 2b are not immersed in the liquid to be measured 15 When the detection unit 2 cannot detect the water quality information, the temperature measurement unit 6 functions as the ambient temperature measurement unit 4, and the correction unit 5 outputs the information input from the temperature measurement unit 6 to the water quality measurement unit 2. The ambient temperature information is stored in the storage means. Next, as shown in FIG. 4, the solution to be measured 15 is supplied into the container 14, or the solution to be measured 1 is supplied to the flow path.
By circulating 5 or the like, the sensitive part of the working electrode 2a and the liquid junction 21 of the reference electrode 2b are immersed in the liquid to be measured 15 so that the water quality information can be detected by the water quality detection part 2, and the temperature is measured. The correction unit 5 causes the storage unit to store the information input from the temperature measurement unit 6 as the liquid temperature information of the liquid to be measured 15 by causing the unit 6 to function as the liquid temperature measurement unit 3. Then, based on the stored ambient temperature information and liquid temperature detection information, the correction unit 5 corrects the water quality information detected by the water quality detection unit 2.

At this time, in the correction unit 5, the ambient temperature information may be corrected by using one ambient temperature information obtained by one measurement by the temperature measurement unit 6. However, the water quality information can be corrected by using a plurality of ambient temperature information obtained by a plurality of measurements. In this case, the correction unit 5 may process a plurality of atmosphere temperature information by calculating and deriving an average value of a plurality of atmosphere temperature information and using this average value to correct the water quality information, or a plurality of atmospheres. The ambient temperature at the time of water quality measurement by the water quality detection unit 2, which is inferred from the temporal change of the temperature information, is derived, and the derived ambient temperature is used to correct the water quality information.

When the water quality information is corrected by using the average value, the measurement error of the ambient temperature by the temperature measuring unit 6 can be reduced, and the ambient temperature at the time of water quality measurement can be determined from the change with time of the ambient temperature information. In the case of analogy, it is possible to deal with a slight change in the ambient temperature, and in any case, more accurate correction of water quality information can be performed.

Further, there are cases where it is desired to continuously measure a plurality of types of liquids 15 to be measured. In this case, for example, the measured liquid 15 supplied into the container 14 such as a beaker is measured for its water quality by the electrochemical water quality measuring device 1, and after the measurement is completed, the measured liquid 15 is taken out from the container 14. Then, it is general to wash with pure water or the like, put another liquid to be measured 15 in the container 14 and measure again.

At this time, the solution to be measured 1 was once removed from the container 14.
In order to take out 5, the measurement liquid detection unit 7 detects that the water quality detection unit 2 cannot detect water quality information, and the temperature measurement unit 6 functions as the liquid temperature measurement unit 3 to measure the ambient temperature. It becomes a state that functions as the unit 4. At this time, the detection result by the temperature measuring unit 6 is affected by the liquid temperature of the measured liquid 15 or pure water attached to the temperature measuring unit 6 or the responsiveness of the temperature measuring unit 6 itself. Ambient temperature cannot be detected.

Therefore, the correction unit 5 changes from the state in which the water quality information can be detected by the water quality detection unit 2 to the state in which the water quality information cannot be detected by the detection result by the measurement liquid detection unit 7. The atmosphere temperature information stored in the storage means is not updated until a certain time has elapsed, and the information detected by the temperature measuring unit 6 after the certain time has elapsed is stored as the atmospheric temperature information, and then the water quality is measured. Detector 2
When it becomes possible to detect the water quality information, it is preferable to use the ambient temperature information to correct the water quality information. The “fixed time” at this time can be experimentally derived from the response of the temperature measuring means 6 and the like, and is set appropriately according to the configuration of the device.

Before the elapse of a certain period of time after the detection result of the measurement liquid detecting section 7 is changed from the state in which the water quality detecting section 2 can detect the water quality information to the state in which the water quality detecting section 2 cannot detect the water quality information. In addition, a new liquid to be measured 15 is placed in the container 14.
Is supplied, the ambient temperature information is not updated by the correction unit 5, and the correction unit 5 remains unupdated at this time. It is preferable to newly correct the water quality information based on the ambient temperature information used to correct the existing water quality information.

As the above-mentioned measurement liquid detecting section 7, for example, 2
It is possible to use a device including a pair of electrodes facing each other, a voltage generator for applying a voltage to the electrodes, and an energization detector for detecting the presence or absence of energization between the electrodes. This is because the water quality information can be detected by the water quality detection unit 2 when a voltage is applied between the two electrodes facing each other at the time of measurement and the liquid to be measured 15 is present between the electrodes and electricity is confirmed. It is possible to detect that there is no liquid to be measured 15 between the electrodes and to energize without detecting that the water quality information cannot be detected by the water quality detection unit 2.

An electric conductivity meter can be used as the measurement liquid detecting section 7. It has two opposing electrodes,
It has a voltage generator that applies a voltage to the electrodes and a current detector that measures the value of the applied current, and determines the electrical conductivity of the measured liquid 15 from the value of the applied current. At this time, when the measured liquid 15 exists between the electrodes, it is detected that the electrical conductivity can be measured and the water quality detection unit 2 can detect the water quality information.
When there is not, since the electrical conductivity cannot be measured because the electric resistance becomes infinite, it is possible to detect that the water quality detection unit 2 cannot detect the water quality information.

The measurement liquid detecting section 7 having the above-mentioned structure is
Sensitive part of working electrode 2a and liquid junction 21 of reference electrode 2b
If the sensitive portion of the working electrode 2a and the liquid junction 21 of the reference electrode 2b are not immersed in the liquid to be measured 15, the two electrodes of the liquid to be measured 7 are also covered by being disposed at the same height as the above. In addition to being prevented from being immersed in the measuring liquid 15, the two electrodes of the measuring liquid detecting unit 7 also in the state where the sensitive part of the working electrode 2a and the liquid junction 21 of the reference electrode 2b are immersed in the measured liquid 15. It is soaked in the liquid to be measured 15.

In addition, the example shown in FIG.
Is a float that moves upward due to buoyancy when it is placed in the measured liquid 15, and a signal is sent to the measurement liquid determination unit 5b when the float is placed at a predetermined placement position by detecting the placement position of the float. The thing constituted by the float switch provided with the switch which transmits is shown.

This float switch is provided so as to detect whether or not the position of the liquid surface of the measured liquid 15 is in a position where the water quality detection unit 2 can detect water quality information. The float is disposed below the sensitive part of the working electrode 2a and the liquid junction 21 of the reference electrode 2b and is provided so as to be movable upward, so that the liquid surface of the measured liquid 15 is the sensitive part of the working electrode 2a and the reference electrode 2b. When the float reaches above the liquid junction portion 21 and the float rises above the sensitive portion of the working electrode 2a and the liquid junction portion 21 of the comparison electrode 2b, the switch transmits a signal, and this signal is input to the correction portion 5. Then, the measurement liquid determination unit 5b determines that the water quality detection unit 2 can detect water quality information.

In addition, the example shown in FIG.
When a load above a certain level is detected, the measurement liquid determination unit 5b
Shows a configuration of a weight switch that sends a signal to. Such a weight switch is arranged in the container 14 into which the liquid to be measured 15 is supplied or in the flow path through which the liquid to be measured 15 flows, and is a liquid sufficient for the water quality detection unit 2 to normally measure the water quality. The load that is detected when a certain amount of the measured liquid 15 exists in the container 14 or the flow path is set in advance, and when a load equal to or larger than this load is detected, a signal is transmitted to the measured liquid determination unit 5b. It is a thing.

In the illustrated example, the weight switch is the measured liquid 15
Is provided at the bottom of the container 14 to which the liquid is supplied, and for example, when the liquid level of the measured liquid 15 in the container 14 reaches above the sensitive part of the working electrode 2a and the liquid junction 21 of the comparison electrode 2b. The load to be measured is set in the weight switch, and when a load equal to or greater than this load is detected, a signal is transmitted to the measurement liquid determination unit 5b. Then, the correction unit 5
In this case, when this signal is input to the correction unit 5, the measurement liquid determination unit 5b determines that the water quality detection unit 2 can detect water quality information.

When the measuring liquid detecting section 7 including such a float switch and a weight switch is provided, the measuring liquid detecting section 7 is provided.
Can determine whether or not the liquid to be measured 15 exists, and whether or not the water quality detection unit 2 has a sufficient amount of liquid to normally measure the water quality. It is possible to prevent the measurement even though there is not enough liquid to measure the water quality, and to measure the water quality only in the normal measurement state in the water quality detection unit 2.

Further, the water quality detecting section 2 may be provided so as to also serve as the measurement liquid detecting section 7. That is, the range of the detection result by the water quality detection unit 2 is set in advance when the amount of liquid sufficient for the water quality detection unit 2 to normally measure the water quality exists in the container 14 or the flow path. When the detection result by the water quality detection unit 2 is within this set range, the measurement liquid determination unit 5b in the correction unit 5 determines that the water quality detection unit 2 is in a state where water quality information can be detected, and the water quality detection unit 2 If the detection result in step 5 is not within this setting range,
In step b, the water quality detection unit 2 determines that the water quality information cannot be detected.

The electrochemical water quality measuring device 1 in each of the above-described embodiments is installed in a water treatment device such as an electrolyzed water producing device to control the treatment operation of such a water treatment device. Can be used for.

In FIG. 9, an electrochemical water quality measuring instrument 1 comprising a water quality detecting unit 2, a liquid temperature measuring unit 3, an ambient temperature measuring unit 4 and a correcting unit 5 is provided inside a water treatment device 8 to The water quality of the water flowing through the processing device 8 can be measured by the electrochemical water quality measuring device 1.

The illustrated water treatment device 8 is an electrolyzed water producing device 8a.
The electrolytic cell 9a is disposed as the water treatment unit 9 in the housing. At least a pair of electrodes is disposed inside the electrolytic cell 9a, and by passing an electrolytic current between the electrodes, the raw water such as tap water or well water supplied into the electrolytic cell 9a is electrolyzed to generate alkaline ionized water. It produces treated water (electrolyzed water) such as or acidic ionized water.

The downstream end of the raw water flow passage 10 through which raw water flows is introduced into the housing.
The downstream end of 0 is connected to the water treatment section 9. Here, the upstream end of the raw water flow path 10 is opened as an inflow port outside the housing, and this inflow port is connected to a water supply curran 23 which is a raw water supply means.

The upstream end of the treated water flow passage 11 through which the treated water treated by the water treatment portion 9 flows is introduced into the housing, and the upstream end of this treated water passage 11 is the water treatment portion 9. It is connected to the. Here, the downstream end of the treated water channel 11 is opened as a discharge port outside the housing.

Although only one system of treated water channels 11 is shown in the drawing, two systems of treated water channels 11 for separately ejecting alkaline ionized water and acidic ionized water produced in the electrolytic cell are provided. You may arrange.

Further, an electrochemical water quality measuring instrument 1 composed of a water quality detecting section 2, a liquid temperature measuring section 3, an ambient temperature measuring section 4 and a correcting section 5 is disposed in the housing, and the water quality detecting section is provided. The liquid to be measured 1 that flows through the treated water flow path 11 by 2
The water temperature information of 5 (electrolyzed water) is detected, and the liquid temperature of the liquid to be measured 15 (electrolyzed water) flowing through the treated water channel 11 is measured by the liquid temperature measuring unit 3. When the change in the liquid temperature in the water treatment unit 9 (electrolysis tank 9a) is small, the liquid temperature measuring unit 3 is arranged on the side of the raw water flow passage 10 to measure the temperature of the water flowing through the raw water flow passage 10. You can

In the water treatment device 8 configured as described above, the raw water is supplied from the inlet to the water treatment section 9 through the raw water flow passage 10.
It is supplied to the (electrolysis tank 9a), electrolyzed in the water treatment section 9, and led out from the outlet through the treated water channel 11 as treated water (electrolyzed water). In such a water treatment process, water quality information is detected by the water quality detection unit 2 of the treated water (the liquid to be measured 15) while flowing through the treated water passage 11, and the treated water is distributed in the raw water passage 10 or the treated water passage 11. Raw water or treated water (measured liquid 1
The water temperature of 5) is measured. Further, the ambient temperature is measured by the ambient temperature measuring unit 4 provided in the water treatment device 8.

The measurement results of the water quality detecting unit 2, the liquid temperature measuring unit 3, and the ambient temperature measuring unit 4 are input to the correction unit 5,
The water quality information by the water quality detection unit 2 is corrected, and accurate water quality information is derived.

The water quality information thus derived can be used for controlling the operation of the water treatment section 9 such as electrolysis conditions. For example, a pH provided with a silver / silver chloride electrode that is the comparison electrode 2b and a glass electrode that is the working electrode 2a as the water quality detection unit 2.
When the water quality detection unit 2 for detection is provided, the pH of the electrolyzed water generated from the electrolyzer 9a is detected, and based on the detection result, electrolyzed water having a desired pH is generated so that the electrolyzer 9a is generated. In this case, it is possible to control the treatment conditions in the above, and at this time, the operation of the water treatment section 9 is controlled based on accurate water quality information.

The example shown in FIG. 9 is a water treatment device 8 similar to that shown in FIG. 8, in which a drainage part 12 is provided in a treated water flow path 11 and water is not flowing through the water treatment device 8. The water in the flow path 8 at least at the location where the electrochemical water quality measuring device 1 is disposed is drained from the drainage part 12 through the drainage flow path 13.

Further, an electrochemical water quality measuring instrument 1 composed of a water quality detecting portion 2, a temperature measuring portion 6, a measured liquid detecting portion 7 and a correcting portion 5 is disposed in the housing. At this time, the water quality detection unit 2 is arranged on the side of the treated water channel 11 to detect the water quality information of the electrolyzed water (water to be treated) flowing through the treated water channel 11. Further, the temperature measuring unit 6 is disposed on the raw water flow passage 10 side and functions as a liquid temperature measuring unit 3 that measures the liquid temperature of the raw water flow passage 10 when water flows through the raw water flow passage 10. When water does not flow, it functions as the ambient temperature measuring unit 4 that measures the ambient temperature. The measurement liquid detection unit 7 is disposed on the raw water flow path 10 side, and detects whether or not the water quality detection unit 2 can measure the water quality information of the measured liquid 15.

In the water treatment device 8 thus constructed,
When the raw water is not supplied from the inlet and the water is not flowing in the device, the measurement liquid determination unit 5b of the correction unit 5 causes the water quality detection unit 2 to detect the water quality information based on the detection result of the measurement liquid detection unit 7. Is determined to be undetectable, the temperature measuring unit 6 functions as the ambient temperature measuring unit 4, and ambient temperature information is stored in the storage unit of the correcting unit 5.

Next, when the raw water is supplied from the inlet and the water flows into the apparatus, the measurement liquid determination unit 5b of the correction unit 5 causes the water quality information detection unit 2 to detect the water quality information based on the detection result of the measurement liquid detection unit 7. Is determined to be detectable, the temperature measuring unit 6 functions as the liquid temperature measuring unit 3, the liquid temperature information is stored in the storage unit of the correction unit 5, and is detected by the water quality detecting unit 2. Water quality information is also stored in the storage unit of the correction unit 5.

Then, in the correction section 5, the water quality information is corrected based on the atmosphere temperature information, the liquid temperature information and the water quality information, and accurate water quality information is derived.

When the supply of raw water from the inflow port is stopped, the water in the water treatment device 8 is drained from the drain section 12 to the drain channel 1.
The water is drained through the water treatment device 3, and no water exists in the water treatment device 8. At this time, based on the detection result of the measurement liquid detection unit 7, the measurement liquid determination unit 5b of the correction unit 5 determines that the water quality detection unit 2 cannot detect the water quality information, and the temperature measurement unit 6 again determines the atmosphere. The function as the temperature measuring unit 4 is started, and the ambient temperature information is stored in the storage unit of the correcting unit 5.

Here, in the drawing, the temperature measuring unit 6 is shown as the raw water flow path 1.
Although it is arranged on the 0 side, it may be arranged on the treated water channel 11 side. Further, the drainage section 12 is also disposed on the treated water channel 11 side, but has a structure in which water does not exist in the channel in which the electrochemical water quality measuring instrument 1 is disposed when water is not flowing due to the draining operation. If it exists, it may be disposed on the raw water flow path 10 side.

As the measurement liquid detecting unit 7, in addition to the above-mentioned ones, a flowing water detecting unit 7 for detecting the presence / absence of water flow in the flow channel.
a can be provided. A pressure sensor or a flow rate sensor can be used as the flowing water detection unit 7a.

As the pressure sensor, for example, a valve body that can be moved toward the downstream side of the flow path by the flow pressure of water, an elastic body that urges the valve body toward the upstream side of the flow path, and a valve body It is possible to provide a device that has a sensing unit that detects the position of arrangement of the valve, so that the sensing unit detects the amount of movement of the valve body against the biasing force of the elastic body, The fluid pressure of is derived. In addition, the liquid to be measured 1 in the channel
5 is preset with a fluid pressure value when water quality information can be detected by the water quality detection unit 2, and when the fluid pressure detected by the pressure sensor is equal to or higher than this set value, When the measured liquid determination unit 5b determines that the water quality information can be detected by the water quality detection unit 2 and the detected fluid pressure is less than the set value, the measured liquid determination unit 5b of the correction unit 5 determines that the water quality is The detection unit 2 determines that the water quality information cannot be detected.

The flow rate sensor is a sensor whose output value changes according to the flow rate of water. Further, when the flow rate of the liquid to be measured 15 in the flow channel is set in advance so that the water quality information can be detected by the water quality detection unit 2, and when the flow rate detected by the pressure sensor is equal to or more than this set value First, the measurement liquid determination unit 5b of the correction unit 5 determines that the water quality information can be detected by the water quality detection unit 2. If the detected flow rate is less than the set value, the measurement liquid determination unit 5b of the correction unit 5 determines. The unit 5b determines that the water quality detection unit 2 cannot detect water quality information.

When the measurement liquid detecting unit 7 (running water detection unit 7a) including such a pressure sensor or flow rate sensor is provided, the measurement liquid detecting unit 7 not only determines whether or not the liquid to be measured 15 exists. It is possible to determine whether or not the water quality detection unit 2 has a sufficient amount of liquid to normally measure the water quality, and even if the water quality detection unit 2 does not have a sufficient amount of liquid to normally measure the water quality. The measurement of water quality can be performed only in the normal measurement state in the water quality detection unit 2 by preventing measurement regardless of the measurement.

As the drainage section 12, the valve body which is movable toward the downstream side of the drainage flow path 13 when pressed by the water pressure, and the downstream side of the drainage flow path 13 relative to the valve body. It is possible to provide a drain switch including a valve seat provided and an elastic body that urges the valve seat toward the upstream side of the drain flow path 13. As a result, when raw water is supplied from the inlet and water is flowing through the device, the flow pressure due to water flow is applied to the valve element, and the valve element resists the urging force from the elastic body to the valve seat. It is possible to flow toward the raw water flow path 10 or the treated water flow path 11 by closing the drainage flow path 13 by moving toward. Further, when the raw water is not supplied from the inlet and the flow pressure of the water is not applied to the inside of the device, the valve body is separated from the valve seat by the urging force of the elastic body, and the drainage flow path 13 can be opened for draining. . As a result, the water in the flow path in which the electrochemical water quality measuring instrument 1 is present can be caused to flow out through the drainage flow path 13 when water is not flowing.

As the drainage section 12, the drainage channel 13 is used.
It is also possible to arrange an electromagnetic valve for opening and closing the flow of the liquid. In this case, in particular, it is preferable to provide the flowing water detecting unit 7a as the measuring liquid detecting unit 7. That is, when the flowing water detection unit 7a detects the flow of the measured liquid 15, the electromagnetic valve is controlled to be closed so that the raw water flow passage 10 or the treated water flow passage 11 is caused to flow water. When it is detected that the measured liquid 15 is not flowing, the electromagnetic valve is opened and the drainage flow path 13 is drained by causing water to flow. As a result, the water in the flow path in which the electrochemical water quality measuring instrument 1 is present can be made to flow out through the drain flow path 13 when water is not flowing.

Further, the electrolytic cell 9a may be provided so as to also serve as the flowing water detecting section 7a. At this time, an ammeter for detecting the presence / absence of energization of the electrolysis current is arranged in the electrolytic cell 9a, and the detection result by the ammeter is input to the measurement liquid determination section 5b of the correction section 5, so that the electrolytic cell 9a In the state in which the voltage is applied between the electrodes in, the energization of the electrolytic current between the electrodes is detected by the ammeter.
If b determines that the water quality information can be detected by the water quality detection unit 2, and the energization of the electrolytic current is not detected,
The measurement liquid determination unit 5b determines that the water quality detection unit 2 cannot detect water quality information.

That is, the water is supplied from the inflow port and the flow path in the water treatment device 8 is filled with the water, so that the water quality detecting section 2 can detect the water quality information and the inside of the electrolytic cell 9a. It is a state in which water is filled so that electrolysis is possible, and it is determined that the water quality information can be detected by the water quality detection unit 2 by detecting the passage of the electrolysis current in the electrolytic cell 9a at this time. Is. Further, if water is not supplied from the inflow port or if the water supply from the inflow port is stopped, the water is drained from the flow path in the water treatment device 8, and the water quality information is detected by the water quality detection unit 2. Is not detectable, and the electrolysis tank 9a is in a state in which electrolysis is not possible due to the absence of water. At this time, by detecting that the electrolysis current does not flow in the electrolysis tank 9a,
The water quality detector 2 determines that the water quality information cannot be detected.

Further, as the measurement liquid detecting unit 7, a unit for detecting the water quality of the treated water derived from the water treatment unit 9 (electrolysis tank 9a) is provided, and the measurement liquid judging unit 5b of the correcting unit 5 uses this measurement liquid. When the change in the measurement value in the detection unit 7 is measured, it is determined that the water quality information can be detected in the water quality detection unit 2, and when the change in the measurement value in the measurement liquid detection unit 7 is not measured, the water quality is determined. It is also possible to determine that the detection unit 2 cannot detect water quality information.

That is, the fact that the water quality of the water detected by the measurement liquid detecting section 7 changes means that the water is treated in the water treatment tank 9, that is, the water quality is supplied to the water treatment device. This means that the water quality information can be detected by the detection unit 2, and therefore the measurement liquid detection unit 7
It is determined whether or not the water quality information can be detected by the water quality detection unit 2 based on the presence or absence of the change in the measured water quality value in.

At this time, the measured liquid detecting section 7 uses water p
A device for measuring H, electric conductivity and the like can be mentioned, and the water quality detection unit 2 can also be provided as a unit serving also as the measurement liquid detection unit 7. In this case, based on the change in the water quality information detected by the water quality detection unit 2, the measurement liquid determination unit 5
b determines whether or not the water quality detection unit 2 can detect water quality information.

In each of the above-exemplified embodiments, the electrochemical water quality measuring device 1 is mainly shown for pH measurement using a glass electrode as the working electrode 2a for explanation. The configuration of the chemical water quality measuring device 1 is not limited to such one, and various forms can be used. For example, various ion selective electrodes such as a calcium ion selective electrode are provided as the working electrode 2a. Therefore, various ion concentrations can be measured.

The water treatment device 1 is mainly described by taking an electrolyzed water producing device as an example, but the water treatment device 1 is not limited to such a form, and various forms may be used. Examples thereof include a water purifier, a mineral water generation device, a water purification device for a 24-hour bath, and a device such as a water purification tank.

[0113]

As described above, the electrochemical water quality measuring device according to claim 1 of the present invention is an electrochemical water quality measuring device having a water quality detecting means composed of a reference electrode and a working electrode. A liquid temperature measuring means for measuring the temperature, an atmosphere temperature measuring means for measuring the temperature of the atmosphere in which the water quality detecting means is arranged, a liquid temperature measured by the liquid temperature measuring means and an atmosphere temperature measuring means Since the correction means corrects the water quality information detected by the water quality detection means based on the ambient temperature, the influence of the liquid temperature of the measured liquid on the electrode potential of the working electrode as well as the comparison of the ambient temperature By also correcting the influence of the electrode on the electrode potential, the target water quality information can be accurately detected.

According to the invention of claim 2, in claim 1, since the atmosphere temperature measuring means is arranged in the vicinity of the water quality detecting means without contact, the atmosphere temperature in the vicinity of the reference electrode is corrected by the water quality information. The detection error of the water quality information due to the change in the electrode potential of the reference electrode due to the influence of the ambient temperature is controlled by not detecting the temperature of the exterior of the reference electrode that is easily affected by the temperature of the measured liquid when measuring the ambient temperature. Can be corrected more accurately.

According to the invention of claim 3, in claim 1 or 2, since the heat insulating material is interposed between the atmosphere temperature measuring means and the water quality detecting means, the water quality detecting means and the atmosphere temperature measuring means are not in direct contact with each other. In this state, the distance between the two can be easily shortened, the ambient temperature can be detected in the vicinity of the reference electrode, and the exterior of the reference electrode that is easily affected by the temperature of the liquid to be measured when measuring the ambient temperature. It is possible to reliably prevent the detection of the temperature, and it is possible to more accurately correct the detection error of the water quality information due to the change in the electrode potential of the comparison electrode due to the influence of the ambient temperature.

Further, the invention of claim 4 is, in any one of claims 1 to 3, a state in which the water quality can be measured by the temperature measuring means which also functions as the liquid temperature measuring means and the ambient temperature measuring means, and the water quality detecting means. The temperature measuring means detects when the measuring solution detecting means detects that the water quality can be measured by the water quality detecting means. Using the temperature information as the liquid temperature information and using the temperature information detected by the temperature measuring means as the atmosphere information when the measured liquid detecting means detects that the water quality cannot be measured by the water quality detecting means, the water quality Since the information is corrected, it is possible to detect the liquid temperature and the ambient temperature with one temperature measuring means and use the temperature for correcting the water quality information.

According to a fifth aspect of the invention, in the fourth aspect, the measurement liquid detecting means detects two electrodes facing each other, a voltage generator for applying a voltage to the electrodes, and an energization detecting for energizing between the electrodes. It is composed of a meter, and detects whether or not the water quality can be measured by the water quality detection means based on the presence / absence of electric current between the electrodes. When the energization is detected, it is judged that the water quality can be measured by the water quality detection means and the temperature information detected by the temperature measurement means is used as the liquid temperature information, and there is no liquid to be measured between the electrodes. When the energization between the electrodes is not detected, it is determined that the water quality cannot be measured by the water quality detecting means, and the temperature information detected by the temperature measuring means is used as the ambient temperature information to obtain one temperature measuring means. Liquid temperature and ambient temperature It is those that can be used for correction of water quality information by.

Further, in the invention of claim 6, in claim 4, since the measuring liquid detecting means is an electric conductivity meter, when the electric conductivity is detected, the water quality can be measured by the water quality detecting means. Using the temperature information detected by the temperature measurement means as the liquid temperature information, it is determined that the water quality cannot be measured by the water quality detection means when the electrical conductivity is not detected, and the temperature By using the temperature information detected by the measuring means as the ambient temperature information, the liquid temperature and the ambient temperature can be detected by one temperature measuring means and used to correct the water quality information.

The invention according to claim 7 is the float according to claim 4, wherein the measuring liquid detecting means is lifted by buoyancy when the measuring liquid detecting means is arranged in the liquid to be measured, and the position where the float is arranged is higher than a predetermined position. Since it is a float switch composed of a switch that sends a signal when the water quality is detected, the water quality is detected by the water quality detection means when the position of the liquid level of the measured liquid reaches a position where the water quality can be measured by the water quality detection means. Is determined to be in a measurable state, the temperature information detected by the temperature measuring means is used as the liquid temperature information, and the position of the liquid surface of the measured liquid does not reach the position where the water quality can be measured by the water quality detecting means. Sometimes, the water quality detection means can determine that the water quality cannot be measured, and the temperature information detected by the temperature measurement means can be used as the ambient temperature information. It can be determined based on whether or not there is a sufficient amount of liquid to be measured by the water quality detecting means to normally measure the water quality, and the water quality detecting means normally determines the water quality. It is possible to prevent the measurement even if there is not enough liquid for the measurement, and to measure the water quality only in a normal measurement state by the water quality detection means.

[0120] According to the invention of claim 8, in claim 4, since the measuring liquid detecting means is a weight switch for detecting a weight applied from the liquid to be measured, the weight of the measuring liquid is determined by the water quality detecting means. When the measurable amount is reached, the water quality detecting means determines that the water quality can be measured, and the temperature information detected by the temperature measuring means is used as the liquid temperature information. When the water quality cannot be measured by the detection means, it is determined that the water quality cannot be measured by the water quality detection means, and the temperature information detected by the temperature measurement means can be used as the ambient temperature information. The measurement liquid detection means determines not only based on whether or not the measurement target liquid is present, but also based on whether or not the measurement target liquid has a sufficient amount of the measurement target liquid to normally measure the water quality. Water quality detection means It is possible to prevent performing normal measurement despite there is not enough liquid to measure water quality, it is capable of performing measurements of water quality only in a normal measurement state by the water quality detection means.

According to a ninth aspect of the invention, in the fourth aspect, the water quality detecting means is provided also as the measuring liquid detecting means, and when the detection result of the water quality information is within a predetermined range, the water quality detecting means operates. It detects that the water quality can be measured, and when the detection result of the water quality information is out of the specified range, it detects that the water quality cannot be measured by the water quality detection means. When the result is within the predetermined range, the water quality detecting means determines that the water quality can be measured, and the temperature information detected by the temperature measuring means is used as the liquid temperature information, and the detection result of the water quality information is predetermined. When it is not within the range of 1, the water quality detection means determines that the water quality cannot be measured, and the temperature information detected by the temperature measurement means is used as the ambient temperature information.
The liquid temperature and the ambient temperature can be detected by one temperature measuring means and used for correcting the water quality information.

Further, the invention of claim 10 is based on claims 4 to 9.
In any one of the above, the correction means detects a plurality of ambient temperature information detected by the temperature measurement means when the measurement liquid detection means detects that the water quality cannot be measured by the water quality detection means, and Water quality information based on the liquid temperature information detected by the temperature measurement means when the measurement liquid detection means detects that the water quality can be measured by the water quality detection means after the ambient temperature information is detected. The ambient temperature is not detected when the water quality is detected, but instead of the ambient temperature when the water quality is detected by the water quality detection means, a plurality of ambient temperatures immediately before the liquid temperature detection are used. The water quality information can be corrected based on the detection result, and the temperature and ambient temperature can be detected by one temperature measuring means and used to correct the water quality information, and more accurate water quality information can be obtained. It is capable of performing the correction.

The invention of claim 11 relates to claims 4 to 1.
In any one of 0, the correction unit changes the temperature after a lapse of a fixed time after the detection result of the measurement liquid detection unit changes from the state in which the water quality can be measured by the water quality detection unit to the state in which the water quality cannot be measured by the water quality detection unit. Since the water quality information is corrected based on the ambient temperature information detected by the measuring means, the influence of the liquid temperature of the measured liquid adhering to the temperature measuring means and the influence of the responsiveness of the temperature measuring means itself. It is possible to accurately measure the ambient temperature by preventing the occurrence of an error in the detection result of the ambient temperature due to.

According to a twelfth aspect of the present invention, in the eleventh aspect, the correction means and the detection result of the measurement liquid detection means are:
After changing from a state in which the water quality can be measured by the water quality detecting means to a state in which the water quality cannot be measured by the water quality detecting means, when the water quality changes by the water quality detecting means before the elapse of a certain time, Since the water quality information is corrected based on the ambient temperature information used to correct the water quality information when the water quality can be measured by the previous water quality detection means, the ambient temperature should be detected immediately before the liquid temperature detection. Even in a state where accurate water quality information cannot be obtained, accurate correction of the water quality information can be performed using the ambient temperature information used when the water quality information was previously detected.

According to a thirteenth aspect of the invention, in any one of the tenth to twelfth aspects, the correction means corrects the water quality information based on the average value of the plurality of atmosphere temperature information. The measurement error can be reduced and the water quality information can be corrected more accurately.

According to a fourteenth aspect of the present invention, in any one of the tenth to twelfth aspects, the correcting means estimates the ambient temperature at the time of detecting the water quality information by the water quality detecting means, which is estimated from the change with time of the plurality of ambient temperature information. Since the water quality information is corrected based on the above, even if a slight change in the ambient temperature occurs, the ambient temperature at the time of detection of the water quality information can be analogized to correct the water quality information more accurately. Is something that can be done.

Further, a water treatment apparatus according to a fifteenth aspect of the present invention is a water treatment apparatus comprising a flow path from an inflow port to an outflow port, and a water treatment unit for processing raw water flowing through this flow path. Since the electrochemical water quality measuring device according to any one of claims 1 to 14 is provided as a water quality measuring device for measuring the water quality of water flowing in the road, the result of measuring the water quality by the electrochemical water quality measuring device is provided. Can be used to control the treatment operation of the water treatment device, and at this time, not only the influence of the liquid temperature of the measured liquid on the electrode potential of the working electrode but also the influence of the ambient temperature on the electrode potential of the reference electrode. The target water quality information can be accurately detected by correcting the above.

A water treatment apparatus according to a sixteenth aspect of the present invention is a water treatment apparatus comprising a flow path from an inflow port to an outflow port, and a water processing unit for processing raw water flowing through this flow path. The electrochemical water quality measuring device according to any one of claims 4 to 14 is provided as a water quality measuring device for measuring the water quality of water flowing through a passage, and water is supplied from an inflow port into the flow passage. In the state where the water temperature is not measured, a drainage means for draining water in at least the area where water quality is measured by the electrochemical water quality measuring instrument is provided in the flow path, so that the liquid temperature and the ambient temperature are measured by one temperature measuring means. It can be used for detection and correction of water quality information.At this time, in the state where water is being supplied from the inflow port into the flow path and water treatment is being performed, the temperature measuring means is used as the ambient temperature measuring means. Functioning from the inlet to the flow path In a state where made supply is water treatment has been performed is capable of detecting the quality of the water after treatment with the functioning of the temperature measuring means as the ambient temperature measuring means.

According to a seventeenth aspect of the present invention, in the sixteenth aspect, as the measurement liquid detecting means, there is provided a valve element which is arranged in the flow channel and is movable in a flow direction of water in the flow channel, and a valve element. A pressure sensor including an elastic body that urges the valve body toward the upstream side of the flow path and a sensing unit that detects whether or not the valve body is moving is provided. When it is detected that the valve body has moved toward the downstream side of the flow path against the biasing force of the elastic body, it is determined that the water quality can be measured by the water quality detection means, and the sensing unit Since it is determined that the water quality cannot be measured by the water quality detection means when the movement of the valve body is not detected, the measurement liquid detection means not only determines whether or not the measured liquid exists, Sufficient liquid for the water quality detector to normally measure water quality. It is possible to determine whether or not there is a water quality detection unit, and prevent the water quality detection unit from making measurements even if there is not enough liquid to measure the water quality normally. The water quality can be measured only in the state.

According to the eighteenth aspect of the present invention, in the sixteenth aspect, a flow rate sensor whose output value changes according to the flow rate of water in the flow path is provided as the measurement liquid detecting means, and the correcting means determines the output value of the flow rate sensor. When the water quality is above a certain level, it is judged that the water quality can be measured by the water quality detection means, and when the output value from the flow sensor is less than a certain value, it is judged that the water quality cannot be measured by the water quality detection means. Therefore, the measurement liquid detecting means not only determines whether or not the liquid to be measured is present, but also determines whether or not the water quality detecting means has a sufficient amount of liquid to normally measure the water quality. It is possible to prevent the measurement of water quality even if the water quality detection means does not have enough liquid to normally measure the water quality, and the water quality detection means can measure the water quality only under normal measurement conditions. What you can do .

The invention according to claim 19 is the water treatment part according to claim 16, which comprises an electrolytic bath for subjecting raw water to electrolytic treatment, and an ammeter for detecting the presence or absence of energization of electrolytic current is provided in this electrolytic bath. Formed as the measurement liquid detecting means, the correcting means determines that the water quality can be measured by the water quality detecting means when the passage of the electrolytic current is detected, and the water quality detecting means when the passage of the electrolytic current is not detected. Since it is determined that the water quality cannot be measured, it is possible to detect whether or not the water quality can be measured by the water quality detection means without separately providing a measurement liquid detection means. Is.

According to a twentieth aspect of the present invention, in the sixteenth aspect, as the measurement liquid detecting means, a means for measuring the water quality of the water after being treated in the water treatment section is provided, and the correcting means is the measurement liquid detecting means. If there is a change in the water quality measurement result, it is determined that the water quality can be measured by the water quality detection means, and if there is no change in the water quality measurement result, the water quality cannot be measured by the water quality detection means. Since it is determined that the water quality is present, it is possible to detect whether or not the water quality can be measured by the water quality detection means without separately providing the measurement liquid detection means.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of an embodiment of the present invention.

FIG. 2 is a schematic diagram showing another example of the embodiment of the present invention.

FIG. 3 is a schematic diagram showing still another example of the embodiment of the present invention.

FIG. 4 is a schematic diagram showing still another example of the embodiment of the present invention.

FIG. 5 is a schematic view showing another aspect of the above embodiment.

FIG. 6 is a schematic diagram showing still another example of the embodiment of the present invention.

FIG. 7 is a schematic diagram showing still another example of the embodiment of the present invention.

FIG. 8 is a cross-sectional view showing an example of the configuration of a comparison electrode.

FIG. 9 is a schematic diagram showing still another example of the embodiment of the present invention.

FIG. 10 is a schematic diagram showing still another example of the embodiment of the present invention.

FIG. 11 is a graph showing the temperature dependence of the electrode potential of a silver / silver chloride electrode.

[Explanation of symbols]

1 Electrochemical water quality measuring instrument 2b Working electrode 2a Reference electrode 8 water treatment equipment 9 Water treatment department 9a Electrolyzer 15 liquid to be measured 16 Insulation

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[Procedure amendment]

[Submission date] November 19, 2001 (2001.11.
19)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007] Here, reference electrode, the inner part liquid internal electrodes is formed by providing a liquid junction in the container while arranged in a container which is sealed, immersing the only liquid junction to target solution because it is intended to ensure the continuity of the internal fluid and the target solution, the temperature of the reference electrode is hardly affected the temperature of the test solution, temperature of the internal solution in which has become the ambient temperature by If there is a difference between the liquid temperature of the liquid to be measured and the ambient temperature, the comparison electrode will show the electrode potential at the ambient temperature. Thereafter, the temperature of the internal solution gradually but approaches the liquid temperature of the target solution, is up to the temperature of the internal liquid is the same as the liquid temperature of the test liquid takes also time 3-5 minutes On the other hand, the normal measurement time of water quality is assumed to be 1 minute,
When measuring water quality, the reference electrode shows the electrode potential at ambient temperature.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008] Particularly, in the case of mixing a thickening agent such as carboxymethyl cellulose to the internal fluid within to inhibit or stabilize the outflow of internal fluid, the heat capacity of the internal fluid is increased, the internal The temperature of the liquid is kept at the ambient temperature.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction content]

[0035] As the working electrode 2a, it is possible to use a variety of in accordance with the water quality component which is to be measured electrochemical water quality measuring device 1, for example glass in the case of measuring the pH of the test solution 15 it can be used electrodes and the like.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction content]

FIG. 8 shows an example of the comparison electrode 2b. The reference electrode 2b is provided with internal liquid 20 in the container 18,
And an internal electrode 19 which is immersed in the internal liquid 20 is constructed by arranging, also, the bottom of the vessel 18 liquid junction 21 made of porous ceramics or the like is formed. Such saturated potassium chloride solution as the reference electrode 2b as internal solution 20 may be used, for example silver / silver chloride electrode or the like disposed silver electrode as the internal electrode 19. In addition, 1 in the figure
7 cap to seal the container 18, 16 is connected to the conductive wire in the internal electrode, 22 a replenishment port for replenishing the internal liquid 20 in the container 18, respectively.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0037

[Correction method] Change

[Correction content]

[0037] The water quality detector 2 (glass film in the case of glass electrode) sensitive sites of the working electrode 2a together with is immersed in the measurement solution 15, a liquid junction 21 Again the measured comparison electrode 2b Information on electromotive force generated by being immersed in the liquid 15 is output as water quality information.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0048

[Correction method] Change

[Correction content]

[0048] intended to show here, using the correction equation, the electromotive force detected by the water quality detection portion 2, of the internal liquid 20 temperature and the reference electrode 2a of the measured solution 15 temperature (ambient temperature)
Is converted to an electromotive force at a predetermined temperature (25 ° C), and the water quality information (pH in this example) is calculated from the converted electromotive force.
Is derived.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0093

[Correction method] Change

[Correction content]

[0093] example shown in FIG. 10, the drainage unit 12 in a similar water treatment apparatus 8 to that shown in FIG. 9, the processing flow path 11
When the water is not flowing through the water treatment device 8, the water in the flow path of the water treatment device 8 at least at the location where the electrochemical water quality measuring instrument 1 is disposed is drained from the drain portion 12. Water is drained through the flow path 13.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G01N 27/06 G01N 27/26 371B 27/26 371 33/18 C 27/414 27/46 346 33/18 353Z 351B 27/30 301Z F term (reference) 2G060 AC02 AE17 AE18 AE40 AF08 AF13 AG08 FA01 HC02 HC03 HC13 HC15 HC19 HC21 4D061 DA03 DB07 DB08 EA02 EB01 EB04 EB14 EB19 EB37 GA02

Claims (20)

[Claims] 1. An electrochemical water quality measuring instrument having a water quality detecting means comprising a reference electrode and a working electrode, comprising: a liquid temperature measuring means for measuring a liquid temperature of a liquid to be measured; and an atmosphere in which the water quality detecting means is arranged. Atmosphere temperature measuring means for measuring the temperature, and correction for correcting the water quality information detected by the water quality detecting means based on the liquid temperature measured by the liquid temperature measuring means and the ambient temperature measured by the atmosphere temperature measuring means And an electrochemical water quality measuring device. 2. The electrochemical water quality measuring instrument according to claim 1, wherein the ambient temperature measuring means is arranged in the vicinity of the water quality detecting means without contacting the water quality detecting means. 3. A heat insulating material is interposed between the ambient temperature measuring means and the water quality detecting means.
Or the electrochemical water quality measuring device according to 2. 4. Compensation comprising: a temperature measuring unit that serves both as a liquid temperature measuring unit and an ambient temperature measuring unit; and a measured liquid detecting unit for detecting whether or not the water quality can be measured by the water quality detecting unit. The means uses the temperature information detected by the temperature measuring means as the liquid temperature information when the measurement liquid detecting means detects that the water quality can be measured by the water quality detecting means. The water quality information is corrected by using the temperature information detected by the temperature measurement means as the atmosphere information when the measurement liquid detection means detects that the measurement liquid cannot be measured. 3. The electrochemical water quality measuring device according to any one of 3 above. 5. The measurement liquid detecting means is composed of two electrodes facing each other, a voltage generator for applying a voltage to the electrodes, and a current-carrying detector for detecting the current-carrying between the electrodes. The electrochemical water quality measuring instrument according to claim 4, wherein the presence or absence of the water quality detecting means detects whether or not the water quality can be measured. 6. The electrochemical water quality measuring device according to claim 4, wherein the measuring liquid detecting means is an electric conductivity meter. 7. The measurement liquid detecting means is composed of a float that is lifted by buoyancy when it is arranged in the liquid to be measured, and a switch that emits a signal when the position where the float is arranged is above a predetermined position. 5. The electrochemical water quality measuring device according to claim 4, which is a float switch. 8. The electrochemical water quality measuring device according to claim 4, wherein the measuring liquid detecting means is a weight switch for detecting a load applied from the liquid to be measured. 9. The water quality detecting means is provided also as the measuring liquid detecting means, and when the detection result of the water quality information is within a predetermined range, the water quality detecting means detects that the water quality can be measured. The electrochemical water quality measuring instrument according to claim 4, wherein when the detection result of the water quality information is out of a predetermined range, the water quality detecting means detects that the water quality cannot be measured. . 10. The plurality of atmosphere temperature information detected by the temperature measuring means when the correcting means detects that the measurement liquid detecting means is in a state in which the water quality cannot be measured, Water quality information based on the liquid temperature information detected by the temperature measurement means when the measurement liquid detection means detects that the water quality can be measured by the water quality detection means after the ambient temperature information is detected. The electrochemical water quality measuring device according to any one of claims 4 to 9, wherein the electrochemical water quality measuring device is used for correction. 11. The temperature measurement is performed after a lapse of a certain time after the correction means changes from a state in which the water quality detection means can measure the water quality to a state in which the water quality detection means cannot measure the water quality. 11. The electrochemical water quality measuring instrument according to claim 4, wherein the water quality information is corrected based on the atmospheric temperature information detected by the means. 12. The correction means changes the detection result of the measurement liquid detection means from a state in which the water quality can be measured by the water quality detection means to a state in which the water quality cannot be measured by the water quality detection means, and before a certain period of time elapses. When the water quality can be measured by the water quality detection means, the water quality information can be corrected based on the ambient temperature information used to correct the water quality information when the water quality was previously measured by the water quality detection means. The electrochemical water quality measuring instrument according to claim 11, which is performed. 13. The electrochemical water quality according to claim 10, wherein the correction means corrects the water quality information based on an average value of a plurality of atmosphere temperature information. Measuring instrument. 14. The correcting means corrects the water quality information based on the atmospheric temperature at the time of detecting the water quality information by the water quality detecting means, which is estimated from the changes with time of the plurality of atmosphere temperature information. Claims 10 to 1
2. The electrochemical water quality measuring device according to any one of 2. 15. A water treatment device comprising a flow passage extending from an inflow port to an outflow port, and a water treatment unit for treating raw water flowing through the flow passage, the water quality measuring water quality of the water flowing in the flow passage. A water treatment apparatus comprising the electrochemical water quality measuring device according to any one of claims 1 to 14 as a measuring device. 16. A water treatment device comprising a flow path from an inflow port to an outflow port, and a water treatment unit for treating raw water flowing through the flow channel, the water quality for measuring the quality of water flowing through the flow channel. The electrochemical water quality measuring device according to any one of claims 4 to 14 is provided as a measuring device, and at least the electricity in the flow passage is measured when water is not supplied from the inflow port into the flow passage. A water treatment device comprising drainage means for draining water in a region where water quality is measured by a chemical water quality measuring device. 17. A valve body, which is arranged in the flow channel and is movable in the flow direction of water in the flow channel, as the measurement liquid detecting means, and the valve body is urged toward the upstream side of the flow channel. A pressure sensor including an elastic body that operates and a sensing unit that detects whether or not the valve body is moving is provided, and the correction unit includes a valve that resists the biasing force of the elastic body by the valve body in the sensing unit. When it is detected that the body moves toward the downstream side of the flow path, it is determined that the water quality can be measured by the water quality detection means, and when the movement of the valve body is not detected by the sensing unit, the water quality is detected. The water treatment device according to claim 16, wherein the water quality is determined to be in a state in which the water quality cannot be measured by the means. 18. A measurement liquid detection means is provided with a flow rate sensor whose output value changes according to the flow rate of water in the flow path, and the correction means is a water quality detection means when the output value from the flow rate sensor is a certain value or more. It is determined that the water quality cannot be measured by the water quality detection means when the output value of the flow rate sensor is less than a certain value. 16. The water treatment device according to 16. 19. A water treatment section is provided with an electrolyzer for subjecting raw water to electrolysis, and an electrometer for detecting the presence or absence of energization of an electrolysis current is provided in this electrolyzer to form a measurement liquid detecting means.
The correction means determines that the water quality can be measured by the water quality detection means when the passage of the electrolysis current is detected, and the water quality cannot be measured by the water quality detection means when the passage of the electrolysis current is not detected. The water treatment device according to claim 16, wherein the water treatment device is determined to be present. 20. As the measurement liquid detecting means, a means for measuring the water quality of the water after being treated in the water treatment section is provided, and the correcting means is used when the measurement result of the water quality by the measurement liquid detecting means changes. In addition, it is determined that the water quality can be measured by the water quality detection means, and if there is no change in the measurement result of the water quality, the water quality detection means determines that the water quality cannot be measured. The water treatment device according to claim 16.