CN209858552U - Automatic calibrating device for online COD water quality monitor - Google Patents

Abstract

The utility model relates to an online COD water quality monitor is with automatic calibrating installation. The device comprises a first liquid mark bottle, a second liquid mark bottle, a third liquid mark bottle, a fourth liquid mark bottle, a five-way valve, a control unit, a first peristaltic pump, a second peristaltic pump, a sample injection pool and a waste liquid bottle. The first liquid mark bottle, the second liquid mark bottle, the third liquid mark bottle and the fourth liquid mark bottle are respectively connected with four inlets of the five-way valve through pipelines, an outlet of the five-way valve is connected to the top of the sample injection pool through the first peristaltic pump, the bottom of the sample injection pool is connected with the waste liquid bottle through the second peristaltic pump, and the top of the sample injection pool is further connected with a detected online COD water quality monitor. The control unit is in signal connection with the five-way valve, the first peristaltic pump and the second peristaltic pump and is used for controlling the conduction and the closing of all valve paths of the five-way valve and the working states of the first peristaltic pump and the second peristaltic pump. The utility model has the advantages of low cost, high degree of automation and simple operation.

Description

Automatic calibrating device for online COD water quality monitor

Technical Field

The utility model belongs to the technical field of environmental chemometrics, in particular to an automatic calibrating device for an online COD water quality monitor.

Background

Chemical oxygen demand (COD or CODcr) is the amount of oxidant consumed by the oxidative decomposition of a reduced substance in water under certain stringent conditions with the addition of a strong oxidant, expressed as mg/L of oxygen. The chemical oxygen demand reflects the degree of pollution of water by reducing substances, such as organic matters, nitrite, ferrous salt, sulfide and the like, but the amount of inorganic reducing substances in general water and wastewater is relatively small, and the pollution by the organic matters is very common, so that COD can be used as a comprehensive index of the relative content of the organic substances.

An on-line COD water quality monitor is an instrument for continuously and automatically analyzing Chemical Oxygen Demand (COD) in industrial wastewater, domestic sewage and surface water. The method is widely applied to monitoring and production units such as environment monitoring stations, municipal drainage monitoring stations, tap water companies, sewage treatment plants and the like. In order to ensure the accuracy and reliability of the measurement data of the instrument, the equipment needs to be subjected to quantity value tracing by a local metering technical mechanism according to the JJG 1012 Chemical Oxygen Demand (COD) online automatic monitor verification regulation every year.

Zero drift, indication error and stability items in the specified verification items in the verification rules of the JJG 1012-2006 Chemical Oxygen Demand (COD) online automatic monitor; wherein, the zero drift needs to be measured for 8 times at intervals of 30min within 4 hours, the indicating value error needs to be measured for 9 times at 3 times respectively at 50mg/L, 150mg/L and 500mg/L3 concentration points, and the indicating value stability needs to be measured for 24 times at intervals of 1 hour within 24 hours; it takes about 36 continuous hours to complete the calibration work of one online COD water quality monitor.

At present, technicians in a metering department need to manually watch standard samples to replace when carrying out on-line verification work of the COD water quality monitor, so that verification items such as zero drift, indicating error, stability items and the like are completed. Therefore, if the verification work of the online Chemical Oxygen Demand (COD) water quality monitor is finished according to the verification regulation of the JJG 1012-2006 COD online automatic monitor without the help of an automatic means, the requirement on the human resource allocation of a metering department is very high; in order to solve the problems, an automatic calibrating device for an online COD water quality monitor needs to be developed.

Disclosure of Invention

The utility model aims at providing a low-cost, high degree of automation, easy operation's online COD water quality monitoring appearance is with automatic calibrating installation in order to solve the manpower resource demand breach that the measurement department carried out online COD water quality monitoring appearance examination during operation.

The utility model provides a technical scheme that technical problem took does:

the utility model discloses a first liquid bottle, second liquid bottle, third liquid bottle, fourth liquid bottle, five-way valve, the control unit, first peristaltic pump, second peristaltic pump, advance kind pond and waste liquid bottle.

The first liquid mark bottle, the second liquid mark bottle, the third liquid mark bottle and the fourth liquid mark bottle are respectively connected with four inlets of the five-way valve through pipelines, an outlet of the five-way valve is connected to the top of the sample injection pool through the first peristaltic pump, the bottom of the sample injection pool is connected with the waste liquid bottle through the second peristaltic pump, and the top of the sample injection pool is further connected with a detected online COD water quality monitor.

The control unit is in signal connection with the five-way valve, the first peristaltic pump and the second peristaltic pump and is used for controlling the conduction and the closing of all valve paths of the five-way valve and the working states of the first peristaltic pump and the second peristaltic pump.

The first liquid standard bottle, the second liquid standard bottle, the third liquid standard bottle and the fourth liquid standard bottle are respectively used for storing a zero calibration solution, a 50mg/L standard solution, a 150mg/L standard solution and a 500mg/L standard solution.

Furthermore, the pipeline is a tetrafluoroethylene pipe.

The utility model has the advantages that: the utility model discloses by the leading-in appearance pond of control unit control five-way valve and first peristaltic pump with corresponding standard solution in accurate time, by being examined the standard solution that the instrument extraction advances the appearance pond and carry out the work of examining, by the useless mark liquid of control unit control second peristaltic pump evacuation in the appearance pond, this device has low cost, high degree of automation, easy operation's advantage.

Drawings

FIG. 1 is a structural diagram of the automatic calibrating device for the on-line COD water quality monitor.

In the figure: 1. the device comprises a first liquid standard bottle, a second liquid standard bottle, a third liquid standard bottle, a fourth liquid standard bottle, a fifth-way valve, a sixth.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

As shown in fig. 1, a first standard solution bottle 1, a second standard solution bottle 2, a third standard solution bottle 3 and a fourth standard solution bottle 4 respectively store a zero calibration solution, a 50mg/L standard solution, a 150mg/L standard solution and a 500mg/L standard solution; the 4 standard bottles are connected with 4 inlets of the five-way valve 5 through polytetrafluoroethylene tubes; the rest 1 outlet of the five-way valve is connected with the top of a sample injection pool 7 through a polytetrafluoroethylene tube by a first peristaltic pump 6; the bottom of the sample injection pool is connected with a waste liquid bottle through a pipeline and a second peristaltic pump 8; the control unit 10 controls the rotation, the flow rate and the stop action of the first peristaltic pump and the conduction and the closing state of each valve path of the five-way valve, and each standard solution is extracted from the corresponding liquid standard bottle to the sample injection pool; the control unit controls the second peristaltic pump to pump the waste liquid in the sample cell to a waste liquid bottle 9; the detected online COD water quality monitor 11 extracts corresponding standard solution in the sample feeding pool through the sample feeding pipe for detection; the waste liquid bottle is used for receiving and storing waste label liquid.

The first liquid mark bottle, the second liquid mark bottle, the third liquid mark bottle and the fourth liquid mark bottle are respectively used for storing a zero point calibration solution and standard solutions with the concentrations of 50mg/L, 150mg/L and 500mg/L, the control unit controls the five-way valve to conduct a passage of the inlet A and the outlet and close a passage of the inlet B, C, D and the outlet, the zero point calibration solution is led into the sample injection pool through the first peristaltic pump, and a detected instrument extracts the zero point calibration solution in the sample injection pool to carry out zero point drift project detection; after the zero drift project verification is completed, the control unit controls the second peristaltic pump to empty the sample feeding pool; the control unit controls the five-way valve to conduct a passage between the inlet B and the outlet and close a passage between the inlet A, C, D and the outlet, 50mg/L standard solution is introduced into the sample introduction pool through the first peristaltic pump, when the 50mg/L standard solution introduced into the sample introduction pool reaches a set capacity, the control unit controls the first peristaltic pump to stop acting and the second peristaltic pump to start acting, the standard solution in the sample introduction pool is emptied, the cleaning step of the sample introduction pool is carried out, after the cleaning steps are repeated for two times, the 50mg/L standard solution with the set capacity is introduced into the sample introduction pool, and the 50mg/L standard solution in the sample introduction pool is extracted by the detected instrument to carry out indication error item detection of a 50mg/L concentration point; when the detected instrument detects the indicating value error of the concentration value of 150mg/L, the automatic detection device conducts a passage of an inlet C and an outlet of the five-way valve and closes a passage of an inlet A, B, D and an outlet, and the detection is carried out according to the same detecting steps of the indicating value error item of the concentration value of 50 mg/L; when the detected instrument detects the indicating value error of the concentration value of 500mg/L, the automatic detection device conducts a passage between the inlet D and the outlet of the five-way valve and closes a passage between the inlet A, B, C and the outlet, and the detection is carried out according to the same detecting steps of the indicating value error item of the concentration value of 50 mg/L; after the calibration item of the indicating value error of the concentration value of 500mg/L is finished, the control unit controls the first peristaltic pump to continuously introduce 500mg/L of standard solution with set volume into the sample injection pool, and the instrument to be tested continuously extracts the 500mg/L of standard solution in the sample injection pool to perform calibration of the indicating value stability item; after finishing all the verification items, the control unit controls the second peristaltic pump to start to act to empty the 500mg/L standard solution in the sample injection pool, controls the first peristaltic pump to extract the zero calibration solution to finish the cleaning of the sample injection pool and the pipeline according to the cleaning steps, and finishes the whole automatic verification process.

Example (b): in the embodiment, the device is used for detecting an online COD water quality monitor; the first liquid mark bottle, the second liquid mark bottle, the third liquid mark bottle and the fourth liquid mark bottle are respectively used for storing a zero calibration solution and standard solutions with the concentrations of 50mg/L, 150mg/L and 500mg/L, the control unit controls the five-way valve to conduct the inlet A and the outlet and close the inlet B, C, D and the outlet, the zero calibration solution is led into the sample injection pool by controlling the first peristaltic pump to run for 40 seconds at the flow rate of 600mL/min, and the detected instrument extracts the zero calibration solution in the sample injection pool to carry out zero drift project detection; after the zero drift project verification is completed, the control unit controls the second peristaltic pump to operate for 50 seconds at the flow rate of 600mL/min to empty the sample injection pool; the control unit controls the five-way valve to conduct a passage between the inlet B and the outlet and close a passage between the inlet A, C, D and the outlet, 50mg/L standard solution is introduced into the sample injection pool by controlling the first peristaltic pump to run for 20 seconds at the flow rate of 600mL/min, the control unit controls the first peristaltic pump to stop running and the second peristaltic pump to start running, the second peristaltic pump is controlled to run for 25 seconds at the flow rate of 600mL/min to empty the standard solution in the sample injection pool, the cleaning step of the sample injection pool is carried out, after the cleaning steps are repeated twice, the first peristaltic pump is controlled to run for 15 seconds at the flow rate of 600mL/min to introduce the 50mg/L standard solution into the sample injection pool, and the 50mg/L standard solution in the sample injection pool of the detected instrument is extracted to carry out the item verification of the indication error of the 50mg/L concentration point; when the detected instrument detects the indicating value error of the concentration value of 150mg/L, the automatic detection device conducts a passage of an inlet C and an outlet of the five-way valve and closes a passage of an inlet A, B, D and an outlet, and the detection is carried out according to the same detecting steps of the indicating value error item of the concentration value of 50 mg/L; when the detected instrument detects the indicating value error of the concentration value of 500mg/L, the automatic detection device conducts a passage between the inlet D and the outlet of the five-way valve and closes a passage between the inlet A, B, C and the outlet, and the detection is carried out according to the same detecting steps of the indicating value error item of the concentration value of 50 mg/L; after the verification project of the indicating value error of the concentration value of 500mg/L is finished, the control unit controls the first peristaltic pump to operate for 25 seconds at the flow rate of 600mL/min to introduce the standard solution of 500mg/L into the sample injection pool, and the detected instrument continues to extract the standard solution of 500mg/L in the sample injection pool to perform verification of the indicating value stability project; after all the verification items are completed, the control unit controls the second peristaltic pump to run at the flow rate of 600mL/min for 50 seconds to empty the 500mg/L standard solution in the sample injection pool, controls the first peristaltic pump to pump the zero calibration solution to complete the cleaning of the sample injection pool and the pipeline according to the cleaning steps, and the whole automatic verification process is finished.

Claims (2)

1. The utility model provides an online COD automatic checkout device for water quality monitoring instrument, includes first liquid bottle, second liquid bottle, third liquid bottle, fourth liquid bottle, five-way valve, the control unit, first peristaltic pump, second peristaltic pump, advances kind pond and waste liquid bottle, its characterized in that:

the first liquid mark bottle, the second liquid mark bottle, the third liquid mark bottle and the fourth liquid mark bottle are respectively connected with four inlets of a five-way valve through pipelines, an outlet of the five-way valve is connected to the top of a sample injection pool through a first peristaltic pump, the bottom of the sample injection pool is connected with a waste liquid bottle through a second peristaltic pump, and the top of the sample injection pool is also connected with a detected online COD water quality monitor;

the control unit is in signal connection with the five-way valve, the first peristaltic pump and the second peristaltic pump and is used for controlling the conduction and the closing of each valve path of the five-way valve and the working states of the first peristaltic pump and the second peristaltic pump;

the first liquid standard bottle, the second liquid standard bottle, the third liquid standard bottle and the fourth liquid standard bottle are respectively used for storing a zero calibration solution, a 50mg/L standard solution, a 150mg/L standard solution and a 500mg/L standard solution.

2. The automatic calibrating device for the on-line COD water quality monitor according to claim 1, characterized in that: the pipeline is a tetrafluoroethylene pipe.