JP2005321195A - Water quality instrument system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately perform the stabilizing measure related to water quality detecting operation corresponding to the sensing of abnormality in piping for sampling water, in a water quality instrument system equipped with a water quality instrument which performs continuous measurement in relation to the sampled water supplied through piping and leads out the output signal corresponding to water quality to perform water quality detecting operation. <P>SOLUTION: In the water quality instrument system equipped with the water quality instrument 8 for performing the continuous measurement in relation to the sampled water mixed with foreign matter supplied through the piping and leading out the output signal corresponding to water quality, a low-pressure alarm means 16 for detecting the abnormality in the piping is provided and the lead-out of the output signal from the water quality instrument 8 is suppressed according to the sensing of abnormality due to the low-pressure alarm means 16. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a water quality instrument system, and more particularly, to a water quality instrument system including a water quality instrument that performs continuous measurement in sampling water from a sewage treatment plant or a wastewater treatment facility.

  In a conventional water quality instrument system, when performing maintenance work of a water quality instrument, countermeasures against contamination are implemented by switching with a valve or washing a pipe at a constant cycle (for example, Patent Document 1 and Patent Document 2). reference).

JP-A-6-201537 (page 2-3, FIG. 1) JP 2002-90360 A (page 5-7, FIG. 1)

In Patent Document 1, it is necessary to switch the valve at the time of maintenance of the water quality meter, and it is difficult to use the water quality meter for control.
In Patent Document 2, pipe cleaning is carried out at a constant cycle. However, there is a problem that piping is faulty and cannot be relieved when data is abnormal, and it is particularly difficult to use a water quality meter as a control signal. there were.
For example, when water quality meter sampling stops due to foreign matter contamination, bubble contamination or inspection, etc., measurement is performed in the absence of water sampling, and the measurement result is output as an indication value. Therefore, there is a problem that hinders the control using the water quality meter. In particular, when the signal falls to zero, if this signal is used for control, there is a possibility that control with an incorrect set value is performed.

  In order to prevent such problems from occurring, there are some instruments with a signal that can output a sampling interruption signal on the water quality instrument side. However, if a pipe is clogged, a defective signal is output incorrectly. In many cases, there were problems.

  The present invention has been made to solve the above-described problems, and performs continuous measurement on the water sample supplied through the pipe, derives an output signal corresponding to the water quality, and performs the water quality detection operation. In a water quality meter system equipped with a meter, an object is to obtain a water quality meter system capable of accurately performing a stabilization measure relating to a water quality detection operation in accordance with an abnormality detection in a pipe for water sampling.

  The water quality meter system according to the present invention is provided with a water quality meter that performs water quality detection by deriving an output signal corresponding to the water quality by continuously collecting the sampled water in which foreign matters are mixed and supplied through a pipe. In the water quality meter system, derivation of an output signal from the water quality meter is suppressed in accordance with an abnormality detection by an abnormality detection means for detecting an abnormality in the pipe.

  According to the present invention, in a water quality instrument system including a water quality instrument that performs continuous measurement on water sampling supplied through a pipe and derives an output signal corresponding to the water quality to perform a water quality detection operation. It is possible to obtain a water quality instrument system capable of accurately performing a stabilization measure relating to water quality detection operation in accordance with abnormality detection in piping.

Embodiment 1 FIG.
A first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a connection diagram showing a configuration in the first embodiment.

In FIG. 1, water sampling by a water sampling pump 1 collected from a sewage treatment plant or a wastewater treatment plant reservoir WP passes through a water sampling pipe TP, and the flow rate is adjusted by a flow rate control valve 5 provided in a return pipe RP. And sent to the water quality meter 8.
Cleaning water is supplied from the cleaning pipe SP provided with the cleaning electric valve 10. When air bubbles are mixed in the water sampling pipe WP, it is common that the air is extracted from the air vent valve 7 through the air vent stop valve 6.
The inlet pipe IP connected between the pump 1 and the water sampling pipe WP is provided with a water sampling pump motor-operated valve 12 and a check valve 17, and the water sampling motor-operated valve 11 and the water quality are provided in the middle of the water sampling pipe WP. An instrumental electric valve 13 is provided. Further, a discharge pipe EP provided with an electric valve 14 is connected to the water sampling pipe WP. A pressure gauge 15 and a low pressure alarm means PL (contact or alarm device) 16 are provided at the inlet of the water sampling pipe WP to the water quality meter 8.

Next, the operation will be described.
In FIG. 1, there is no problem if the sampling water from the sampling pump 1 is sent to the water quality meter 8 without clogging the sampling pipe TP. In addition, there is a situation in which sampling is not sent to the water quality meter 8 due to clogging of the sampling pipe TP and mixing of bubbles. In general, regular pipe cleaning or the like is carried out. However, the dirt of the pipe varies depending on the degree of dirt in the collected water, and the cleaning time and timing are very difficult at present.

In the first embodiment, the water sampling stop of the water quality meter 8 is detected by the low pressure alarm means PL (contact or alarm device) 16 by the pressure gauge 15 provided at the inlet of the water quality meter 8, and the output signal of the water quality meter 8 is detected. Is stopped in advance, the water sampling pump 1 is stopped, the water sampling pump motor-operated valve 12 is closed, the water quality meter motor-operated valve 13 is closed, the discharge motor-operated valve 14 is opened, and the washing motor-operated valve 10 is opened. In-pipe cleaning of the water sampling pipe TP is performed with the cleaning water supplied from the cleaning pipe SP.
Since the instruction of the water quality meter 8 becomes abnormal during the cleaning period, the output signal is held. After cleaning, normal operation is resumed, and normal operation is resumed when the pressure alarm is restored. The motor-operated valve 11 is opened in the case of pipe cleaning on the pump suction side by pulling up the pump 1.

  In this manner, when an abnormality is detected in the water sampling pipe TP that supplies water to the water quality meter 8, the pipe in the water sampling pipe TP is cleaned with the cleaning water supplied from the cleaning pipe SP. During the cleaning of the water sampling pipe TP, the output signal of the water quality meter 8 is held, and the derivation of the output signal of the water quality meter 8 is suppressed. An abnormal output signal is not derived from the water quality meter 8 and does not adversely affect a control system that uses the output signal of the water quality meter 8.

  According to the first embodiment of the present invention, sampling water contaminated with foreign matters at a sewage treatment plant, a wastewater treatment plant or the like is supplied via a pipe composed of a sampling pipe TP to continuously measure the sampling water for quality. In the water quality meter system including the water quality meter 8 for deriving the corresponding output signal and performing the water quality detection operation, from the low pressure alarm means PL (contact or alarm device) 16 for detecting an abnormality in the pipe consisting of the water sampling pipe TP. An abnormality detection means is provided, and in response to abnormality detection by the abnormality detection means comprising the low pressure alarm means PL (contact or alarm device) 16, the output signal from the water quality meter 8 is held and the water quality meter 8 Since measures to stabilize the water quality detection operation, such as suppressing the derivation of the output signal, were performed, continuous measurement was performed on the water sample supplied through the pipe, and the output corresponding to the water quality was achieved. In a water quality meter system equipped with a water quality meter that conducts water quality detection operations by deriving signals, stabilization measures for water quality detection operations are suppressed by suppressing the derivation of output signals from the water quality meters in response to abnormal detection in pipes for water sampling. It is possible to obtain a water quality instrument system that can accurately perform the above.

  Moreover, according to Embodiment 1 by this invention, the sampling water which a foreign material mixes in a sewage treatment plant, a wastewater treatment plant, etc. is supplied via the piping which consists of the sampling piping TP, and performs continuous measurement about the said sampling. Low water pressure alarm means PL (contact point or alarm device) for detecting an abnormality in the pipe consisting of the water sampling pipe TP in the water quality instrument system including the water quality instrument 8 for deriving an output signal corresponding to the water quality and performing the water quality detection operation An abnormality detection means consisting of 16 is provided, and in response to an abnormality detection by the abnormality detection means consisting of the low pressure alarm means PL (contact or alarm device) 16, the pipe consisting of the water sampling pipe TP is washed with cleaning water, etc. The water quality detection operation is performed by continuously measuring the sampled water supplied through the piping and deriving the output signal according to the water quality. It is possible to obtain a water quality instrument system capable of accurately performing a stabilization measure relating to a water quality detection operation by cleaning water with pipe cleaning water in response to an abnormality detection in a pipe for water sampling in a water quality instrument system equipped with a water quality instrument to be performed. it can.

  Furthermore, according to the first embodiment of the present invention, sampling water contaminated with foreign matters at a sewage treatment plant or a wastewater treatment plant is supplied via a pipe consisting of a sampling pipe TP, and continuous measurement is performed on the sampling water. Low water pressure alarm means PL (contact point or alarm device) for detecting an abnormality in the pipe consisting of the water sampling pipe TP in the water quality instrument system including the water quality instrument 8 for deriving an output signal corresponding to the water quality and performing the water quality detection operation 16 is provided, and the output signal from the water quality meter 8 is held in response to abnormality detection by the abnormality detection means comprising the low pressure alarm means PL (contact or alarm device) 16 and the sampling pipe While performing the washing operation of the pipe made of TP with the washing water, the output signal from the water quality meter 8 during the washing operation of the pipe made of the water sampling pipe TP with the washing water. Since the measure for stabilizing the water quality detection operation such as the hold treatment is continued and the derivation suppression of the output signal from the water quality meter 8 is continued, continuous measurement is performed on the water sample supplied through the pipe. In a water quality meter system equipped with a water quality meter that derives an output signal corresponding to the water quality and performs water quality detection operation, the piping of the water quality meter suppresses the derivation of the output signal from the water quality meter and detects the abnormality It is possible to obtain a water quality instrument system that can perform a washing operation with water for washing and accurately perform a stabilization measure relating to a water quality detection operation.

Embodiment 2. FIG.
A second embodiment according to the present invention will be described with reference to FIG. FIG. 2 is a connection diagram showing a configuration in the second embodiment.
In the second embodiment, the configuration other than the specific configuration described here has the same configuration as the configuration in the first embodiment described above, and has the same function. In the drawings, the same reference numerals indicate the same or corresponding parts.

  In the first embodiment, the water pressure cutoff is detected by the pressure gauge 15 and the low pressure alarm means PL (contact or alarm device) 16, but in this second embodiment whose configuration is shown in FIG. The detection is made by the switch 9. The flow switch 9 can detect the withdrawal of water relatively easily. However, there is a drawback that the detection cannot be adjusted.

  It should be noted that replacing the detection of water withdrawal by the pressure gauge 15 and the low pressure alarm means PL (contact or alarm device) 16 with the flow switch 9 is not limited to the first embodiment, but will be described later. The present invention can also be applied to any configuration from the third embodiment to the fifth embodiment.

  According to Embodiment 2 of the present invention, in the configuration in Embodiment 1 or Embodiment 3 to Embodiment 5 described later, as the abnormality detection means, the pipe made of the water sampling pipe TP is used. Since the provided flow switch 9 is used, in the water quality meter system including the water quality meter that performs continuous measurement on the water sample supplied through the pipe and derives an output signal corresponding to the water quality to perform the water quality detection operation. Thus, it is possible to obtain a water quality instrument system capable of accurately performing a stabilization measure relating to a water quality detection operation in accordance with an abnormality detection by a flow switch in a pipe for water sampling.

Embodiment 3 FIG.
A third embodiment of the present invention will be described with reference to FIG. FIG. 3 is a connection diagram showing a configuration in the third embodiment.
In the third embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configurations in the first and second embodiments described above and exhibits the same operation. It is. In the drawings, the same reference numerals indicate the same or corresponding parts.

  In the first embodiment, the cleaning water is caused to flow from the cleaning pipe SP provided with the electric valve 10, but in FIG. 3, a check valve (for air) 18 is provided in the cleaning pipe SP, and an air source device ( A compressor) 19 is installed, and the water sampling pipe TP is cleaned by air in response to detection of an abnormality such as a low pressure. In air cleaning, foreign substances that cannot be removed by water cleaning can be pushed out and cleaned, and piping can be cleaned efficiently.

  Thus, when an abnormality in the water sampling pipe TP for supplying water to the water quality meter 8 is detected by the low pressure alarm means PL (contact or alarm device) 16, the air source device (compressor) is supplied from the cleaning pipe SP. ) In-pipe air cleaning of the sampling pipe TP is performed by the high-pressure cleaning water supplied from 19 through the check valve (for air) 18, and during the cleaning of the sampling pipe TP, the water quality meter 8 The output signal is held, and the derivation of the output signal of the water quality meter 8 is suppressed. An abnormal output signal is not derived from the water quality meter 8 and does not adversely affect a control system that uses the output signal of the water quality meter 8.

  According to the third embodiment of the present invention, sampling water contaminated with foreign matter at a sewage treatment plant or wastewater treatment plant is supplied via a pipe made of a sampling pipe TP to continuously measure the sampling water to improve the water quality. In the water quality meter system including the water quality meter 8 for deriving the corresponding output signal and performing the water quality detection operation, from the low pressure alarm means PL (contact or alarm device) 16 for detecting an abnormality in the pipe consisting of the water sampling pipe TP. And a cleaning pipe SP and a motor-operated valve 10 for cleaning the pipe consisting of the water sampling pipe TP in response to an abnormality detection by the abnormality detection means consisting of the low pressure alarm means PL (contact or alarm device) 16. Since air cleaning means consisting of a check valve (for air) and an air source device (compressor) 19 is provided, continuous measurement is performed on the water sample supplied through the pipe. In a water quality meter system equipped with a water quality meter that derives an output signal according to the water quality and performs a water quality detection operation, the water quality of the water quality meter is detected by washing the piping according to an abnormality detected in the piping for sampling. It is possible to obtain a water quality instrument system that can accurately perform the stabilization measure.

Embodiment 4 FIG.
A fourth embodiment of the present invention will be described with reference to FIG. FIG. 4 is a connection diagram showing a configuration in the fourth embodiment.
In the fourth embodiment, the configuration other than the specific configuration described here has the same configuration contents as those in the first to third embodiments described above, and has the same operation. Is. In the drawings, the same reference numerals indicate the same or corresponding parts.

In the first embodiment or the second embodiment, the pipe is washed with water or air to return to the normal operation. However, the fourth embodiment adjusts the operating pressure of the pipe.
In FIG. 4, the pipe pressure and flow rate adjusting valve 20 performs pressure adjustment by reducing the opening degree (in the closing direction) to remove foreign matters and the like.
In the case of an abnormal state in which the water sampling pressure is low, the water quality signal is set to the hold state, the control valve 20 is closed, and the pressure of the water sampling pipe is increased to remove foreign matter. When the sampling pressure is restored, normal operation is resumed.
The installation location of the regulating valve 20 may be the inlet of the water quality meter, or the piping pressure may be directly adjusted. Since it is not necessary to use all the valves as motorized valves, the system can be configured at low cost. However, since the pipe cleaning cannot be performed, the removal range is limited.

  According to the fourth embodiment of the present invention, sampling water contaminated with foreign matters at a sewage treatment plant, a wastewater treatment plant or the like is supplied via a pipe composed of a sampling pipe TP to continuously measure the sampling water to improve water quality. In the water quality meter system including the water quality meter 8 for deriving the corresponding output signal and performing the water quality detection operation, from the low pressure alarm means PL (contact or alarm device) 16 for detecting an abnormality in the pipe consisting of the water sampling pipe TP. A pipe for increasing the water sampling pressure in the pipe consisting of the water sampling pipe TP and removing foreign matter in response to the abnormality detection by the abnormality detection means consisting of the abnormality detection means and the low pressure alarm means PL (contact or alarm device) 16 Since the pressure adjusting means comprising the pressure and flow rate adjusting valve 20 is provided, continuous measurement is performed on the sampled water supplied through the pipe, and an output signal corresponding to the water quality is derived. In a water quality instrument system equipped with a water quality instrument that performs detection, stabilization of the water quality detection operation of the water quality instrument by increasing the water sampling pressure in the pipe and removing foreign matter in response to anomaly detection in the pipe for water sampling It is possible to obtain a water quality instrument system that can accurately carry out measures.

Embodiment 5 FIG.
A fifth embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a connection diagram showing the configuration of the fifth embodiment. FIG. 6 is a flowchart showing a signal processing algorithm in the fifth embodiment.
In the fifth embodiment, the configuration other than the specific configuration described here has the same configuration contents as those in the first to fourth embodiments described above, and exhibits the same operation. Is. In the drawings, the same reference numerals indicate the same or corresponding parts.

In the first embodiment to the fourth embodiment, all the output signal from the water quality meter 8 is only held in the abnormal period, but in this fifth embodiment shown in FIGS. 5 and 6, the water quality meter is used. 8 When the maximum change rate value is set in the output signal from 8 and the output signal from the water quality meter 8 suddenly falls to 0, the previous value is held, but in the case of an abnormal change, the maximum change rate value is added. The value was adopted so that fail-safe operation can be performed when the output signal from the water quality meter 8 is used for control.
By adopting this algorithm, the control works more safely, and it is possible to perform stable water quality control because it operates in the safe direction even for abnormal reactions peculiar to water quality instruments other than the withdrawal of water.

  In FIG. 5, a water quality signal control device 21 that controls whether or not to derive the output signal of the water quality meter 8 is connected to the output side of the water quality meter 8.

FIG. 6 shows the control operation of the water quality signal control device 21. In FIG. 6, in step S <b> 1, it is determined whether or not the water sampling pressure drop alarm (including the confirmation timer) is being detected by the abnormality detection means including the low pressure alarm means PL (contact or alarm device) 16. If there is, the water quality signal as the output signal of the water quality meter 8 is held at the previous value (step S2), and if the sampling pressure drop alarm is not in effect, the current water quality signal as the output signal of the water quality meter 8 is adopted (step S3). ).
In step S4, it is determined whether or not the sudden change rate compared with the previous value is large for the current water quality signal as the output signal of the water quality meter 8 from step S3. It is determined whether or not the water quality signal as the output signal of the water quality meter 8 has changed to near 0% (step S5).
In step S4, if the water quality signal sudden change rate is not large, the current water quality signal as the output signal of the water quality meter 8 is adopted (step 9).
If it is determined in step S5 that the water quality signal has changed to near 0%, the water quality signal as the output signal of the water quality meter 8 is held at the previous value (step S6), and the process returns to step S4. If it is determined that the water quality signal has not changed to near 0%, it is determined whether or not the rate of change of the water quality signal as the output signal of the water quality meter 8 is greater than or equal to a set value (step S7).
If it is determined in step S7 that the rate of change of the water quality signal is greater than or equal to the set value, the next value of the output signal of the water quality meter 8 is set to the previous value + maximum rate of change (step 8), and the process returns to step S1.
If the rapid change rate of the water quality signal is not large in step S7, the current water quality signal as the output signal of the water quality meter 8 is adopted (step 9).

  According to the fifth embodiment of the present invention, water sampled with foreign matters in a sewage treatment plant or a wastewater treatment plant is supplied via a pipe made of a water sampling pipe TP, and the water is continuously measured for quality. In the water quality meter system having the water quality meter 8 for deriving the corresponding output signal and performing the water quality detection operation, the water quality signal for generating the control signal for controlling the control target device according to the output signal of the water quality meter 8 Control signal generating means comprising a control device 21 is provided, and the control signal generating means comprising the water quality signal control device 21 compares the current value data of the output signal with the previous value data, and the signal change rate is not abnormal. As a control signal, the control signal is conditionally controlled in accordance with the abnormality detection in the pipe for water sampling, and the stabilization measure for the water quality detection operation is targeted. It is possible to obtain a water quality instrument system that can be carried out in.

In the present invention, the following configurations (1) to (5) have been proposed.
(1) When sampling water contaminated with foreign matter such as sewage treatment plants and wastewater treatment facilities, a water quality meter that performs continuous measurement will detect abnormalities in water quality due to foreign matter and air bubbles being removed due to low water pressure. A water quality instrument system that prevents water quality control abnormalities due to abnormal water quality instrument signals by performing signal hold and automatic pipe cleaning in advance.
(2) When collecting water contaminated with foreign matter such as sewage treatment plants and wastewater treatment facilities, a water quality meter that continuously measures the water quality due to foreign matter or air bubbles being mixed will cause a water quality meter malfunction. A water quality meter system that prevents water quality control abnormalities due to water quality meter signal abnormalities by detecting them in advance and performing signal hold and automatic pipe cleaning in advance.
(3) In sampling water contaminated with foreign matter or bubbles, such as sewage treatment plants and wastewater treatment facilities, detect abnormalities in the water quality meter due to the interruption of water quality meter that continuously measures, and connect the piping in advance. A water quality meter system that removes foreign matter by automatic air cleaning and prevents abnormalities in the water quality meter.
(4) In water sampling where foreign matter or bubbles are mixed, such as in sewage treatment plants and wastewater treatment facilities, it is possible to detect in advance problems caused by the interruption of water sampling by water quality meters that perform continuous measurement, and automatically adjust the water sampling pressure. A water quality instrument system that reduces foreign matter and air bubbles and prevents abnormal output of the water quality instrument.
(5) When water quality meters that perform continuous measurement are used for control in sampling water containing foreign matter or bubbles such as sewage treatment plants and wastewater treatment facilities, the measurement signal is abnormal due to a failure of the sampling pipe such as a sampling interruption. In some cases, this value is an obstacle to using this value for control. This system compares the current value data with the previous value data and enables reliable water quality control by generating and adopting control signals on the condition that the rate of change of the signal is not abnormal and there is no abnormality in water sampling. Water quality instrument system. Water quality automatic signal hold system with water quality meter sampling interruption alarm.

  This invention relates to emergency measures such as pipe cleaning only when there is a malfunction or stopping or starting the pump only when there is a malfunction by judging whether water is collected immediately before the water quality meter, or abnormal water quality signals only when there is a malfunction. By performing the processing, it is possible to perform a fail-safe control operation when the water quality instrument signal is used for water quality control.

  The device according to the present invention is a device for detecting a drop in the sampling water pressure of the pipe and means for cleaning the pipe with the signal, or temporarily stopping and restarting the pump, holding the water quality signal in response to the sampling down signal. In addition, more stable water quality control is possible by performing abnormal signal processing.

It is a connection diagram which shows the structure in Embodiment 1 by this invention. It is a connection diagram which shows the structure in Embodiment 2 by this invention. It is a connection diagram which shows the structure in Embodiment 3 by this invention. It is a connection diagram which shows the structure in Embodiment 4 by this invention. It is a connection diagram which shows the structure in Embodiment 5 by this invention. It is a flowchart which shows the algorithm of the signal processing in Embodiment 5 by this invention.

Explanation of symbols

1 water sampling pump, 2 water sampling valve, 3 water quality meter water sampling valve, 4 water quality meter bypass valve, 5 flow rate adjustment valve, 6 air vent stop valve, 7 air vent valve, 8 water quality meter, 9 flow switch, 10 Motorized valve for washing, 11 Motorized valve for water sampling, 12 Motorized valve for water sampling pump, 13 Motorized valve for water quality meter, 14 Motorized valve, 15 Pressure gauge, 16 Low pressure alarm means (contact or alarm device), 17 Check Valve, 18 Check valve (for air), 19 Compressor (air source device), 20 Pressure-regulated electric valve, 21 Water quality signal control device.

Claims (7)

  In a water quality meter system equipped with a water quality meter that is supplied with water through a pipe and continuously measures the water sample and derives an output signal according to the water quality to perform a water quality detection operation. A water quality instrument system characterized by comprising an abnormality detection means for detecting an error, and suppressing derivation of an output signal from the water quality instrument in response to an abnormality detection by the abnormality detection means.   In a water quality meter system equipped with a water quality meter that is supplied with water through a pipe and continuously measures the water sample and derives an output signal according to the water quality to perform a water quality detection operation. The water quality measuring instrument system is provided with an abnormality detecting means for detecting the pipe, and the pipe is washed in response to the abnormality detection by the abnormality detecting means.   In a water quality meter system equipped with a water quality meter that is supplied with water through a pipe and continuously measures the water sample and derives an output signal according to the water quality to perform a water quality detection operation. In accordance with the abnormality detection by the abnormality detection means, the derivation of the output signal from the water quality meter is suppressed and the piping is cleaned with the cleaning water, and the piping is cleaned with the cleaning water. A water quality meter system that continues to suppress the derivation of the output signal from the water quality meter during a washing operation.   4. An abnormality detection means for detecting an abnormality in the pipe, and an air cleaning means for air-cleaning the pipe in response to an abnormality detection by the abnormality detection means. Water quality instrument system as described in.   In a water quality meter system equipped with a water quality meter that is supplied with water through a pipe and continuously measures the water sample and derives an output signal according to the water quality to perform a water quality detection operation. A water quality measuring instrument system comprising: an abnormality detecting means for detecting water; and a pressure adjusting means for increasing a water sampling pressure in the pipe and removing foreign matter in response to abnormality detection by the abnormality detecting means.   In a water quality instrument system comprising a water quality instrument that is supplied with water from a foreign body through a pipe and continuously measures the water sample to derive an output signal according to the water quality and performs a water quality detection operation. Control signal generating means for generating a control signal according to the output signal is provided, and the control signal generating means compares the current value data of the output signal with the previous value data, and confirms that the rate of change of the signal is not abnormal. A water quality meter system characterized by being derived as a control signal according to conditions. The water quality instrument system according to any one of claims 1 to 6, wherein a flow switch provided in the pipe is used as the abnormality detection means.

Images