KR101039562B1 - Water quality sensors with built-in signal converter - Google Patents

Abstract

PURPOSE: A water quality sensor with a signal conversion function is provided to minimize measurement processes and time because additional conversion and calculation devices are not required. CONSTITUTION: A water quality sensor with a signal conversion function comprises a measurement unit(12) and a signal converter(20). The measurement unit is installed in one side of a cylindrical sensor holder(11). The signal converter is installed inside the sensor holder so that a user can manipulate the converter outside. The signal converter deposits the measurement unit in measurement water and converts an electromotive force value into an output signal of a 4~40mA range.

Description

Water quality sensors with built-in signal converter

The present invention relates to a water quality measurement sensor, and in particular, a signal converter that converts an analog signal into an output signal of a specific mA, V (Voltage) or mV, and incorporates a signal conversion function by integrating with a sensor inside the sensor measuring water quality characteristics. The present invention relates to a water quality measurement sensor with a built-in signal conversion function to reduce the number of equipment for measurement and to facilitate portability.

Conventionally, as a prerequisite for measuring hydrogen ion concentration (pH), which is one of water quality characteristics in the field, a combination of a water quality sensor and a meter (Meter or Controller) is read, and the measured signal is electrically The unified signal, 4 ~ 20mA, RS-232C, RS-485, etc. is transmitted to the control room by itself or by using a separate signal converter.

Similarly, other measurement items are described as examples, and various water quality items such as ORP (redox potential), DO (dissolved oxygen), electrical conductivity, residual chlorine, MLSS, or SS (suspension concentration), turbidity, and sodium Is measured in the same manner as above.

The conventional measuring method is inconvenient to measure by using a separate measuring device for each water quality measurement sensor, and the output signal is also added to the measuring device, a separate signal converter 4 ~ 20mA, RS-232C, RS There was a problem converting and transmitting to a signal such as -485.

In addition, the conventional measuring method as described above requires a separate measuring device for each individual water quality measuring sensor, which increases the volume of equipment and requires a very expensive system operation, thereby causing an economic burden due to maintenance, maintenance, and maintenance. .

In order to solve the above problems, the present applicant filed the application name "No. 10-2008-0038625" "Name: signal conversion transmitter of the water quality measurement sensor" and registered as the registration number 10-0844025.

The signal conversion transmitter of the conventional water quality measurement sensor includes a sensor terminal unit 1 connected to a sensor terminal 5a of the water quality measurement sensor 5 for measuring various water quality characteristics; and, to receive external power. A power supply terminal unit 2 to which a power cable is connected, an analog circuit unit 3 in which an electromotive force value (a sensor-specific analog signal) of the water quality measurement sensor 5 connected to the sensor terminal unit 1 is checked, and an analog circuit unit ( A signal conversion unit 4 for converting the analog signal of the water quality measurement sensor 5 received from 3) into an output signal in the range of 4 to 20㎃; and measuring the minimum and maximum electromotive force values of the water quality measurement sensor 5; A gain terminal section 9 consisting of a minimum value terminal 9a and a maximum value terminal 9b adjusted to set the standard and the minimum value for the reference value and the maximum reference value for the maximum value; and, through the gain terminal section 9, the standard and setting are completed. 4 ㎃ value is output with respect to the EMF minimum value of the water quality measuring sensor 5 An output value adjusting unit 6 comprising a zero adjusting terminal 6a for locking and a span adjusting terminal 6b for adjusting an output value such that a 20 kV value is output with respect to the maximum electromotive force value, and an output signal of the signal converting unit 4; A first output terminal unit 7 for transmitting the adjusted value to the standard test equipment 300 for display when the gain is adjusted by the gain terminal unit 9, and outputting the output signal of the signal conversion unit 4 to the controller 200; And a second output terminal section 8 for transmission and display.

The signal conversion transmitter of the conventional water quality measurement sensor converts and outputs the intrinsic output signal range and unit into a standardized range and unit measurement value, thereby using various water quality measurement sensors 5 as shown in Table 1 below. When displaying the measured result has the advantage that the troublesome to have a separate controller 200 for the signal unit of the water quality measurement sensor 5 is eliminated.

Metric Sensor signal (example) 4mA adjustment 20mA adjustment Output transmission signal Hydrogen ion concentration (pH) + 420mV ~ -420mV +420 mV -420mV 4 ~ 20mA Redox potential (ORP) + 2000mV ~ -2000mV + 2000mV -2000mV 4 ~ 20mA Dissolved Oxygen Concentration (DO) 0 to 900 mV 0 mV 900 mV 4 ~ 20mA Electrical conductivity 20Ω ~ 5MΩ 20 Ω 5 MΩ 4 ~ 20mA Residual chlorine 0 to 900 mV 0 mV 900 mV 4 ~ 20mA Suspended solids concentration (MLSS) 2.5 V to 250 mV 2.5V 250 mV 4 ~ 20mA Suspended solids concentration (SS) 250 mV to 2.5 V 250 mV 2.5V 4 ~ 20mA Turbidity 0 to 3 V 0 V 3 V 4 ~ 20mA salt -200mV ~ + 200mV -200 mV +200 mV 4 ~ 20mA

However, in order to use a signal conversion transmitter of a conventional water quality measurement sensor, a water quality measurement sensor and a signal converter or a controller must be provided. The signal converter converts the analog signal of the sensor into a standardized output signal in the range of 4 to 20 mA. It can be displayed through the controller, but when displaying the output value of the V (Voltage) type, there was an inconvenient problem that requires the work and equipment that need to convert the output signal of 4 ~ 20mA back to the V (Voltage) form.

In addition, the use of the signal converter has a lot of configuration of the device to measure the characteristics of the water quality has a problem that the installation and disassembly is cumbersome and inconvenient to carry.

In addition, in the case of using the conventional signal converter, there is an inconvenience of using a separate standard inspection equipment for gain adjustment for adjusting the zero point.

Because of this, the function of the signal converter is built into the sensor to measure the water quality, so that the portability is improved and a simple device configuration is used when measuring the water quality. The analog signal is converted into a mA output signal or a V (Voltage) output signal. There is an urgent need for a water quality measuring sensor with a built-in signal conversion function to easily determine the replacement time by improving convenience, portability, and operability to selectively output the sensor. to be.

Therefore, the present invention has been made in view of the problems of the prior art as described above, which consists of a device consisting of a water quality sensor, a signal converter, and a controller to measure the characteristics of the water. The aim is to provide a water quality measurement sensor with a built-in signal conversion function to simplify the process.

In addition, another object of the present invention is to convert a measurement signal obtained by converting an analog signal into a mA form in addition to a function of converting an existing analog signal into mA according to a measurement value display condition, and then converting the measurement signal back into a measurement signal in a V (Voltage) form. It's about making it happen.

In addition, another object of the present invention is to convert the analog signal-> mA to <-> V (Voltage) each other is not limited to the measurement value display conditions separate conversion device for converting the measurement value display unit and This is to avoid the need for additional equipment and procedures using calculations.

In addition, another object of the present invention is to make it easy to determine whether the sensor is abnormal because it can identify whether the sensor is abnormal.

In addition, another object of the present invention is to connect the switches for the measurement unit value, zero adjustment, and span adjustment of the output signal to the signal converter to configure the exposure to the outside of the sensor holder, the operation for the selection of the operation and function from the outside simply Is to make this possible.

In addition, another object of the present invention can be configured in a hard form or a flexible form of the PCB substrate forming the signal converter according to the other conditions, such as the shape and size of the sensor, the convenience of manufacturing To increase.

In order to achieve the above object, the present invention deposits a measurement unit installed on one side of the cylindrical sensor holder of the water quality measurement sensor to the measurement water, and outputs an electromotive force value (analog signal unique to the sensor) generated during measurement to an output signal in the range of 4 to 20 mA. In the water quality measurement sensor used in the measuring device to display the measured value on the controller through a signal converter to convert to, the hydrogen ion concentration (mV), the redox potential difference (mV), dissolved oxygen concentration (unit: mV, mA), electrical conductivity (unit: Ω), residual chlorine concentration (unit: mV, mA), suspended solids concentration (MLSS, SS: (unit: mV, mA)), turbidity (unit: mV, mA), Convert the analog signal of the water quality measurement sensor measuring sodium concentration (unit: mV, mA) into an output signal in the range of 4 to 20 mA, or convert the output signal in the range of 4 to 20 mA into an output signal in the range of 1 to 5 V. In the sensor holder of the water quality measuring sensor, the function of the converting signal converter can be operated externally. And the analogue signal is converted into an output signal in the range of 4-20 mA by operating the signal converter, or the output signal in the range of 4-20 mA is converted into an output signal in the range of 1-5 V. It provides a water quality measurement sensor with a built-in signal conversion function, characterized in that configured to display the measured value selectively in mA or V (Voltage) without a separate operation of the controller to be connected.

As described above, the present invention is composed of a water quality measurement sensor, a signal converter, and a controller to measure the characteristics of water quality. This has the effect of simplifying the configuration.

In addition to the function of converting an existing analog signal into mA according to the measurement value display condition, an effect of converting an analog signal into a mA form and converting it into a V (Voltage) type measurement signal is effective. have.

In addition, it is possible to convert from analog signal-> mA to <-> V, so that it is not limited to the measurement value display conditions. Therefore, additional devices and procedures using separate converters and calculations for converting the measurement value display unit are provided. By not requiring it, the measurement step is simplified and the measurement time is shortened.

In addition, it is possible to identify the abnormality of the sensor through the lamp, so that it is easy to determine the abnormality of the sensor, so it is easy to know the replacement cycle by checking the abnormality and life of the sensor without using a separate inspection equipment. have.

In addition, by connecting the switch for measuring unit value, zero adjustment, and span adjustment of the output signal to the signal converter and exposing it to the outside of the sensor holder, it is possible to easily operate for selection of an operation and a function from the outside. .

In addition, the PCB substrate for forming the signal converter according to other conditions such as the shape and size of the sensor can be configured in a hard form or a flexible form, thereby increasing convenience in manufacturing. .

1 is a block diagram for measurement using a signal converter of the conventional water quality measurement sensor,
2 is a simplified configuration diagram showing a water quality measurement sensor with a built-in signal conversion function according to the present invention,
3 is a perspective view of a water quality measurement sensor with a built-in signal conversion function according to the present invention,
4 is a perspective view of a state in which a flexible PC substrate is embedded in a water quality measurement sensor having a signal conversion function according to the present invention;
5 is a configuration diagram in which a wireless transmitter is installed in a water quality measuring sensor having a signal conversion function according to the present invention;
6 is an exemplary view of measuring using a water quality measurement sensor with a built-in signal conversion function according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

As shown in FIG. 2, the water quality measurement sensor having the signal conversion function according to the present invention is deposited by measuring the measurement unit 12 installed at one side of the cylindrical sensor holder 11 of the water quality measurement sensor 10 in the measurement water. The characteristics of the water quality used in the measuring device to display the measured value on the controller 200 through the signal converter 20 for converting the electromotive force value (sensor-specific analog signal) generated during the conversion into an output signal of the 4 ~ 20mA range It relates to a sensor to measure.

First, the water quality measurement sensor 10 is hydrogen ion concentration (unit: mV), redox potential (unit: mV), dissolved oxygen concentration (unit: mV, mA), electrical conductivity (unit: Ω), residual water quality Water quality characteristics such as chlorine concentration (unit: mV, mA), suspended solids concentration (MLSS, SS: (unit: mV, mA)), turbidity (unit: mV, mA), sodium concentration (unit: mV, mA) It means all sensors that measure.

At this time, the water quality is a measurement target for measuring the above characteristics using the water quality sensor 10, in general, chemical processes, food processing, wastewater treatment plants, neutralization facilities, hydroponic culture, water purification plant It means water used for sewage, swimming pool, aeration tank, chemical plant and manufacturing or cooling process, and various experimental water in the field of plating treatment facility and other water quality.

In addition, the water quality sensor 10 is made of a variety of forms and configurations according to the characteristics of the water quality, measuring method, measuring purpose, measuring place and the like, in the present invention 1L of water solution used or used in various places or uses As an example, a hydrogen ion concentration sensor used to measure a hydrogen ion concentration (pH) value, which indicates the number of moles of hydrogen ions present therein, will be described.

The hydrogen ion concentration sensor is configured such that a measurement electrode, a reference electrode, a temperature element, a ground line, and the like, which are not shown in the drawing, are deposited in an internal solution in a glass tube coupled to one side of the sensor holder 11.

On the other hand, the signal converter for converting the analog signal measured by the water quality measurement sensor 10 to the output signal of the 4 ~ 20mA range, or converts the converted output signal of the 4 ~ 20mA range back to the output signal of the 1 ~ 5V range 20 is installed inside the sensor holder 11 of the water quality measurement sensor 10 in a state capable of operating the function from the outside.

That is, the conventional signal converter converts an analog signal into an output signal in the range of 4-20 mA, transfers the signal to the controller 200, and displays the measured value as an output signal of mA, but the signal in the present invention. The converter 20 not only converts an analog signal into an output signal in the range of 4-20 mA, but also transmits it to the controller 200 as an output signal of mA, and outputs the converted output signal in the range of 4-20 mA again in the range of 1-5 V. It can be converted into a signal.

On the other hand, the signal converter 20 converts the output signal of the 4 ~ 20mA range converted analog signal back to the output signal of 1 ~ 5V (Voltage) range, and then converts 1 ~ 5V (Voltage) to 1000 ~ 5000mV It will be configurable to convert.

That is, when the value of V of 1V (Voltage) is converted into 1mV, it is converted into 1000mV.

The signal converter 20 is installed inside the sensor holder 11, and the sensor terminal unit 21, the power supply terminal unit 22, the analog circuit unit 23, the unit signal conversion unit 26, and the zero adjustment terminal (27) and span adjustment terminals 28 are arranged on the PCB substrate.

As shown in FIG. 3 and FIG. 4, the PC apparatus plate may be configured of a phenol resin PC or flexible PC, and in the case of the flexible PC, the cylinder may be used when the inner space of the sensor holder 11 is narrow. It is configured to be rolled up and installed in the form.

As shown in FIG. 2, the sensor terminal 21 constituting the signal converter 20 includes a measurement electrode (Glass electrode, an anode, and a light emitting unit) and a reference electrode installed in the measuring unit 12. The sensor terminal 13 is configured to transmit a signal to the controller 200 on the opposite side to which a cathode, a light receiving unit, a + temperature element, a-temperature element, a ground line, and the like are connected.

Here, the terminal characteristics of the water quality measurement sensor 10 will be described briefly as follows.

1. Hydrogen ion concentration sensor: It consists of measuring electrode (or glass electrode), reference electrode, + temperature device,-temperature device, and ground wire.

2. Redox potential (ORP): consists of measuring electrode, reference electrode, + temperature element,-temperature element, and ground wire.

3. Dissolved Oxygen Concentration (DO): Anode, Cathode, + Temperature Device,-Temperature Device, and Ground Wire.

4. Electrical Conductivity: Anode, Cathode, + Temperature Element, -Temperature Element, Ground Wire.

5. Sodium: Measuring electrode, reference electrode, + temperature element,-temperature element, ground MLSS: light emitting part, light receiving part, + temperature element,-temperature element, ground wire.

6. Suspended material measuring sensor (SS): It consists of a light emitting part, a light receiving part, a + temperature element, a-temperature element, and a ground wire.

The sensor terminal unit 21 is a water ion sensor 10 for measuring hydrogen ion concentration, redox potential, dissolved oxygen concentration, electrical conductivity, residual chlorine, suspended solids concentration (MLSS, SS), turbidity, sodium, and the like. The sensor terminal 13 is connected. That is, the sensor terminal unit 10 has a different number of pins of the sensor terminal 13 according to different types of water quality measuring sensors 10, manufacturers, and manufacturing countries. The terminal 13 is configured to be connected.

The power terminal 22 is connected to a power cable to receive power from the controller 200.

The power terminal 22 may receive power from the controller 200, but may receive power from an external power supply.

On the other hand, the analog circuit unit 23 is configured such that the electromotive force value (analog signal unique to the sensor) of the water quality measurement sensor 10 connected to the sensor terminal unit 21 is checked.

In addition, the unit signal conversion unit 26 is an analog signal of the water quality measuring sensor 10 received from the analog circuit unit 23 via the signal conversion unit 24 in the range of 4 to 20 kHz. And a unit converter 25 for converting an output signal in the range of 4 to 20 kV into a voltage (V) unit output signal representing a voltage unit in the range of 1 to 5 V.

Here, the signal converter 24 is to convert the analog signal of the water quality measurement sensor 10 to only the output signal of 4 ~ 20㎃ like the conventional signal converter.

On the other hand, the unit converter 25 is to convert the output signal of the 4 ~ 20 kHz the analog signal is converted to the output signal of 1 ~ 5V while converting the unit of the output signal to V (Voltage) again.

The outer surface of the sensor holder 11 is connected to the unit conversion unit 25 of the unit signal conversion unit 26 by connecting a switching switch 25a for converting the unit of the output signal to mA or V (Voltage). It can be configured to operate with exposure.

At this time, the changeover switch 25a is configured to be changed in various ways according to the use conditions, such as a switch of a sliding operation method, a rotary operation switch method, a push operation switch, etc. by sliding in a left, right direction or an up and down direction. It will be possible.

In addition, the contact between the switch 25a and the sensor holder 11 is configured to be surrounded by a sealing member (S) to prevent the ingress of moisture and contaminants into the water quality measurement sensor (10).

In addition, the zero adjustment terminal 27 is a terminal for adjusting the output value of 4 kV or 1V with respect to the minimum electromotive force of the water quality measurement sensor 10.

In addition, the span adjustment terminal 28 is a terminal for adjusting the output value such that a 20 kV or 5 V value is output with respect to the maximum electromotive force value.

The zero adjustment terminal 27 and the span adjustment terminal 28 are connected to the zero adjustment switch 27a for adjusting the minimum electromotive force and the span adjustment switch 28a for adjusting the maximum value of the electromotive force, respectively. It can be configured to operate by exposing to the outer surface of).

In addition, the signal is connected to the analog circuit unit 23 of the signal converter 20 and connected to the terminal 31 so that the lamp 30 that emits light in various colors is connected to emit light.

In addition, the lamp 30 and the contact portion of the sensor holder 11 is configured to be surrounded by a sealing member (S) to prevent the ingress of moisture and contaminants into the water quality measurement sensor (10).

That is, the lamp may be colored in different colors depending on the normal state in which the signal is constantly measured and the abnormal state in which the signal is not measured uniformly due to damage of the measuring unit 12 or measurement, abnormality of the reference electrode, lack of internal solution, etc. The 30 is configured to emit light.

In the present invention, the lamp 30 may be used to emit light of a green series when the lamp 30 shows a normal state, or to emit a red series of light when the lamp 30 shows an abnormal state. Depending on other circumstances, the color of the lamp 30 may be configured in other colors.

On the other hand, the sensor terminal 13 is to be configured in the form of a pin, it is a configuration for simplifying the connection with the connection line (not shown in the drawing) connected to the controller 200.

As shown in FIG. 5, the above-described water quality measurement sensor 10 and the controller 200 are connected in a wired manner to transmit a signal, but in another embodiment, a signal converter installed inside the sensor holder 11. The wireless transmitter 14 is connected to and installed at 20 so that the measured value can be wirelessly transmitted to the controller 200 in which the wireless receiver is installed without being connected to the controller 200 using the sensor terminal 13.

As shown in FIG. 2, the zero adjustment switch 27a and the span adjustment switch 28a and the contact portion of the sensor holder 11 prevent the ingress of moisture and contaminants into the water quality measurement sensor 10. It is configured to be surrounded by a sealing member (S).

That is, the present invention operates the signal converter 20 to convert an analog signal into an output signal of the 4 ~ 20mA range to transmit or convert the converted output signal of the 4 ~ 20mA range to an output signal of the 1 ~ 5V range It is configured to selectively display the measured value in mA or V (Voltage) without a separate operation of the controller 200 connected to the water quality measurement sensor 10.

Referring to the operation, operation, and effects of the present invention configured as described above are as follows.

As shown in FIG. 2 and FIG. 6, the water quality measuring sensor 10 includes a measuring electrode (Glass electrode, an anode, a light emitting unit, and a reference electrode (cathode) installed inside the measuring unit 12. Cathode), the light receiving unit), + temperature device,-temperature device, ground wire, etc. are connected to the contact, the sensor terminal 13 is connected to the other side is connected to deliver the measured value to the controller (200).

In order to measure various characteristics of the water quality using the water quality measurement sensor 10 in which the signal converter 20 is embedded, the minimum / maximum range of different electromotive force for each manufacturer and each LOT of various types of water quality measurement sensors 500 In order to unify the immersion of the measuring unit 12 of the water quality measurement sensor 10 in the solution and then adjust the zero adjustment switch (27a) to output a 4 kV or 1V value for the minimum value of the electromotive force, the span adjustment switch ( Set 28a) by adjusting the output value so that the 20V or 5V value is output with respect to the maximum value of the electromotive force.

Thereafter, an additional gain adjustment process may be performed. When the water quality sensor 10 is washed well in distilled water and then immersed in a zero solution (ZERO), the minimum electromotive force (current or Voltage or resistance), that is, an electromotive force corresponding to the minimum value of the measured value is generated. At this time, the zero adjustment switch (27a) and the span adjustment switch (28a) to adjust the exact zero point is to be adjusted to match the minimum value of the water quality measurement sensor 10 theoretically designed at the time of manufacture.

Next, immerse the water quality measurement sensor 10 in a separately prepared zero solution and connect with the controller 200, and when the minimum value of the water quality measurement sensor 10 is confirmed to be stable through the controller 200, the controller 200 To adjust the zero point of the water quality measurement sensor 10 (for example, in the case of DO (dissolved oxygen) sensor, adjust so that 0mV, which is the minimum value of the water quality measurement sensor 10, appears).

When the gain zero adjustment is completed, the zero adjustment switch 27a is adjusted to display the minimum signal transmitted while viewing the numerical value displayed on the controller 200. (For example, in the case of the current signal, 4 mA, which is the minimum value transmitted, Adjust to appear.)

In addition, the minimum voltage signal of 1V is generated for the minimum signal of 4mA.

On the other hand, when the minimum signal output is completed, while adjusting the span adjustment switch 28a so that the maximum signal is displayed while viewing the value displayed on the controller 200. (For example, in the case of a current signal, the maximum value transmitted is 20 mA. So that appears.)

Thereafter, the maximum voltage signal of 5V is generated for the maximum signal of 20mA.

As such, when the gain adjustment and the span adjustment of the water quality measurement sensor 10 are completed, the sensor terminal 13 of the signal conversion transmitter 10 is connected to the controller 200.

Next, when the measurement unit 12 of the water quality measurement sensor 10 is immersed in the measurement water (water) to be measured and the controller 200 is adjusted to perform measurement, the measurement unit 12 performs an analog signal as electromotive force. Is generated.

That is, the measured signal is measured in the water quality measurement sensor 10-> sensor terminal 21 of the signal converter 20-> analog circuit unit 23-> unit signal conversion unit 26-> sensor terminal ( 13)-> The value measured by the controller 200 is calculated.

At this time, the analog signal of the analog circuit unit 23 is converted to the output signal of the range of 4 ~ 20mA through the signal conversion unit 24 of the unit signal conversion unit 26 when the switching switch 25a teaches the mA and the controller The 200 is represented in units of mA.

For example, when the concentration of hydrogen ion concentration (pH) is measured using the water quality measurement sensor 10, the electromotive force for measuring the hydrogen ion concentration is usually a signal of + 420mV ~ -420mV, converted to the electromotive force is usually pH0 It is represented by ~ 14pH, the median value of the electromotive force range of + 420mV ~ -420mV of the water quality sensor 500 for measuring the hydrogen ion concentration is 0mV. That is, the indication value of 0 mV represents the neutral pH7 of the hydrogen ion concentration, which we know well, and when it is converted into a current signal of 4-20 mA, an intermediate value of 12 mA is displayed on the controller 200.

Briefly, once again, it is as shown in Table 2.

Indication
Electromotive force / signal 0 PH 7 PH 14 PH Sensor electromotive force +420 mV 0 mV -420mV Electrical signal transmitted 4 mA 12 mA 20 mA

On the other hand, when the changeover switch 25a teaches V (Voltage), the unit converting unit 25 of the unit signal converting unit 26 converts an output signal in the range of 4 to 20 mA in which the analog signal of the analog circuit unit 23 is converted. It is converted back to the output signal of the 1 ~ 5V range through the controller 200 is displayed in units of V (Voltage).

In addition, Table 3 shows each hydrogen ion concentration, redox potential, dissolved oxygen concentration, electrical conductivity, residual chlorine, suspended solids concentration, and turbidity using the water quality measurement sensor 10 having the signal converter 20 of the present invention. An example of the sensor signal of the water quality measuring sensor 10 to be measured and the output of the output signal in the form of mA and the output of the mA form is shown to be converted to the output signal of the V (Voltage) form.

Metric Sensor signal (example) 4mA / 1mV
adjustment 20 mA / 5 mV
adjustment Output transmission signal (mA) Output transmission signal (mV) Hydrogen ion concentration
(pH) + 420mV ~ -420mV +420 mV -420mV 4 ~ 20mA 1-5V Redox potential
(ORP) + 2000mV ~ -2000mV + 2000mV -2000mV 4 ~ 20mA 1-5V Dissolved oxygen concentration
(DO) 0 to 900 mV 0 mV 900 mV 4 ~ 20mA 1-5V Electrical conductivity 20Ω ~ 5MΩ 20 Ω 5 MΩ 4 ~ 20mA 1-5V Residual chlorine 0 to 900 mV 0 mV 900 mV 4 ~ 20mA 1-5V Suspended solids concentration
(MLSS) 2.5 V to 250 mV 2.5V 250 mV 4 ~ 20mA 1-5V Suspended solids concentration
(SS) 250 mV to 2.5 V 250 mV 2.5V 4 ~ 20mA 1-5V Turbidity 0 to 3 V 0 V 3 V 4 ~ 20mA 1-5V salt -200mV ~ + 200mV -200 mV +200 mV 4 ~ 20mA 1-5V

Therefore, when displaying the result value measured using the various water quality measurement sensors 10 and the separate controller 200 and the cumbersome point that must be provided with a separate controller 200 for the signal unit of the water quality measurement sensor 10 If you do not use the advantage that the cumbersome inconvenience of operating a separate signal converter is eliminated.

That is, the conventional signal converter is limited to the analog signal of the water quality measurement sensor 10 to only the output signal of the 4 ~ 20mA range and displayed by the controller 200, but the signal converter 20 of the present invention is embedded As shown in Table 3, the water quality measuring sensor 10 has a characteristic in which the unit of the output signal is expressed in V (Voltage) as well as mA in each characteristic of the water quality.

Thus, in the case of using the existing signal converter, in order to convert the output value converted from 4-20 mA back to V (Voltage), the controller 200 or a separate converter is required, while the present invention provides a water quality measurement sensor 10 By simply operating the changeover switch (25a) of the signal converter 20 installed inside the) to output the output signal in mA or V (Voltage) to be displayed through the controller 200 to simplify the operation or simplify the equipment There is an advantage to achieve.

In addition, the water quality sensor 10 can easily determine the normal operation state and abnormal operation state during the measurement through the light emitting color of the lamp 30 has the advantage that the convenience of management is increased.

In addition, the water quality measurement sensor 10 has the advantage that the signal converter 20 is built-in does not operate a device capable of a separate signal conversion to simplify the measurement process and reduce the number of devices.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments and is not limited to the spirit of the present invention. Various changes and modifications can be made by those who have

10: water quality sensor 11: sensor holder
12: measuring unit 13: sensor terminal
14: wireless transmitter 20: signal converter
21: sensor terminal portion 22: power terminal portion
23: analog circuit portion 24: signal conversion portion
25 unit conversion unit 25a changeover switch
26; Unit signal converter 27: zero adjustment terminal
27a: zero adjustment switch 28: span adjustment terminal
28a: span adjustment switch 30: lamp
31: terminal 200: controller
S: sealing member

Claims (9)

The measurement unit 12 installed on one side of the cylindrical sensor holder 11 of the water quality measurement sensor 10 is immersed in the measurement water, and the electromotive force value (analog signal unique to the sensor) generated during measurement is output signal in the range of 4 to 20 mA. In the water quality measurement sensor used in the measuring device to display the measured value to the controller 200 via the signal converter 20 to convert to,
Hydrogen ion concentration (unit: mV), redox potential (unit: mV), dissolved oxygen concentration (unit: mV, mA), electrical conductivity (unit: Ω), residual chlorine concentration (unit: mV, mA), suspended solids The analog signal of the water quality measuring sensor 10 measuring concentration (MLSS, SS: (unit: mV, mA)), turbidity (unit: mV, mA), sodium concentration (unit: mV, mA) is 4 to 20 mA. Or a signal converter 20 for converting the converted output signal of the 4 ~ 20mA range into an output signal of 1 ~ 5V (Voltage) range in the state that the function can be operated from the outside. 10) inside the sensor holder 11,
The signal converter 20 is operated to convert an analog signal into an output signal in the range of 4-20 mA and transmit or convert the converted output signal in the 4-20 mA range into an output signal in the range of 1-5 V. Water quality measurement sensor with a built-in signal conversion function, characterized in that configured to display selectively the measured value in mA or V (Voltage) without a separate operation of the controller 200 is connected.
The method of claim 1, wherein the signal converter 20 installed in the sensor holder 11 is a measurement electrode (Glass electrode, an anode, a light emitting unit, a reference electrode (key) installed in the measuring unit 12 The sensor terminal 13 is connected to the sensor terminal 13 to transmit a signal to the controller 200 at the opposite side to which a sword, a light receiving unit, a + temperature element, a-temperature element, and a ground wire are connected.
To configure the power terminal 22 to which the power cable is connected to receive power from the controller 200,
Configure the analog circuit unit 23 in which the electromotive force value (analog signal inherent to the sensor) of the water quality measurement sensor 10 connected to the sensor terminal unit 21 is checked,
The analog signal of the water quality measuring sensor 10 received from the analog circuit unit 23 is converted into an output signal of a unit of ampere, which is in the range of 4 to 20 Hz, through the signal conversion unit 24, and the 4 to 20 Hz The unit signal converting unit 26 is configured by a unit converting unit 25 for converting an output signal in the range of 1 to a voltage (V (Voltage)) unit output signal in the range of 1 to 5V.
A zero adjustment terminal 27 for outputting a 4 kV or 1 V value with respect to the minimum electromotive force of the water quality measurement sensor 10 and a span adjustment terminal 28 for adjusting the output value so that a 20 kV or 5 V value is output with respect to the maximum electromotive force value; Water quality measurement sensor with a built-in signal conversion function, characterized in that consisting of.
The method according to claim 2, wherein the signal is connected to the analog circuit unit 23 of the signal converter 20 and is connected to the terminal 31 so as to emit light by powering the lamp 30 which emits light in various colors. ,
The lamp 30 and the contact portion of the sensor holder 11 is configured to be surrounded by a sealing member (S) to prevent the ingress of moisture and contaminants into the water quality measurement sensor 10,
The lamp 30 may be colored in different colors depending on the normal state in which the signal is constantly measured and the abnormal state in which the signal is not measured uniformly due to the breakage or measurement of the measuring unit 12 or the abnormality of the reference electrode or the lack of internal solution. Water quality measurement sensor with a built-in signal conversion function, characterized in that configured to emit light.
The sensor holder (11) according to claim 2, wherein a unit switch (25) of the unit signal converter (26) is connected to a switch (25a) for converting a unit of an output signal into mA or V (Voltage). It is configured to operate by exposing to the outside of
Signals, characterized in that configured to be coupled to the contact between the switch 25a and the sensor holder 11 surrounded by a sealing member (S) to prevent the ingress of moisture and contaminants into the water quality measurement sensor (10) Water quality sensor with conversion function.
3. The zero adjustment terminal 27 and the span adjustment terminal 28 are connected to a zero adjustment switch 27a for adjusting the minimum electromotive force and a span adjustment switch 28a for adjusting the maximum value of the electromotive force, respectively. It is configured to operate by exposing to the outer surface of the sensor holder 11,
The zero adjustment switch 27a and the span adjustment switch 28a and the contact portion of the sensor holder 11 are surrounded by a sealing member S to prevent intrusion of moisture and contaminants into the water quality measurement sensor 10. Water quality measurement sensor with a built-in signal conversion function, characterized in that configuration.
3. The signal converter of claim 2, wherein the signal converter 20 is configured on a PCB.
The instrument panel is a water quality measurement sensor with a built-in signal conversion, characterized in that consisting of phenol resin PC or flexible PC.
The water quality sensor with a signal conversion function according to claim 2, wherein the sensor terminal is configured in the form of a pin.
[3] The wireless receiver of claim 2, wherein the wireless transmitter 14 is connected to the signal converter 20 installed inside the sensor holder 11 and connected to the controller 200 using the sensor terminal 13. Water quality measurement sensor with a built-in signal conversion function, characterized in that configured to transmit the measured value to the installed controller 200 wirelessly.
The method of claim 1 or 2, wherein the signal converter 20 converts the output signal of the 4 ~ 20mA range from which the analog signal is converted back to an output signal of 1 ~ 5V (Voltage) range, and then 1 ~ 5V (Voltage) Water quality measurement sensor with a built-in signal conversion function characterized in that it is configured to convert the number to 1000 ~ 5000mV.

Images