A detection and calibration device for water quality monitoring electric meter

Abstract

The present invention relates to a detection and calibration device for a water quality monitoring electric meter. An industrial control screen is arranged on the side of a supporting shell, a bracket is arranged on the upper part, a clamping device is arranged on the bracket, the clamping device drives the upper clamping plate to move linearly up and down relative to the lower clamping plate, the lower clamping plate is provided with a through hole, and an interface is arranged in the through hole; the industrial control screen controls the mV module, nA module, uA module, current detection 1, current detection 2, resistor 1, resistor 2, resistor 3, and input / output relay group respectively through a communication bus; the mV module is a voltage module that can output a continuously adjustable mV voltage; the nA module is a current module that can output a continuously adjustable nA current; the uA module is a current module that can output a continuously adjustable uA current; resistor 1, resistor 2, and resistor 3 are resistance modules that can output adjustable resistance respectively. The present invention is suitable for data acquisition inspection and calibration of various water quality monitoring electrodes, has high integration, and is easy to use.

Description

Technical Field

[0001] The present invention relates to the technical field of water quality monitoring equipment, and in particular to a detection and calibration device for water quality monitoring electric meters which is suitable for data collection, inspection and calibration of various water quality monitoring electrodes, has high integration and is easy to use. Background Art

[0002] EC meter is actually a conductivity meter with mS / cm as the measurement unit. DO dissolved oxygen electrode uses polarographic principle, with platinum (Pt) as cathode, Ag / AgCl as anode, and 0.1mol / L potassium chloride (KCl) as electrolyte. When measuring, a polarization voltage of 0.68V is added between the anode and cathode. Oxygen passes through the permeable membrane and is consumed at the cathode. The amount of oxygen that passes through the membrane is proportional to the dissolved oxygen concentration in the water. Therefore, the limiting diffusion current between the electrodes is proportional to the dissolved oxygen concentration in the water. The meter detects this current and converts it into oxygen concentration through calculation. The most commonly used pH indicating electrode. It is a glass tube with a glass membrane sensitive to pH blown on the end. The tube is filled with a buffer solution of a certain concentration. The potential difference between the inner and outer surfaces of the glass membrane that reflects the pH value is derived using the Ag / AgCl conduction system. This potential difference also follows the Nernst formula. The general term for free chlorine and combined chlorine remaining in water. It means that after chlorine is added to water, in addition to the consumption of part of the chlorine by the action with bacteria, microorganisms, organic matter, inorganic matter, etc. in the water, there is still some chlorine left, which is called residual chlorine. Residual chlorine can be divided into combined residual chlorine (referring to the compound of chlorine and ammonia in water, there are three types: NH2Cl, NHCl2 and NCl3, NHCl2 is more stable and has a good bactericidal effect), also called combined residual chlorine; free residual chlorine refers to ClO-, HClO, Cl2, etc. in water, which have fast bactericidal speed and strong bactericidal power, but disappear quickly, also called free residual chlorine; total residual chlorine is the sum of combined residual chlorine and free residual chlorine.

[0003] EC, DO, pH, residual chlorine electrodes and meters have different detection principles and different signal sources. These detection parameters are commonly used in water quality monitoring. pH detects mV signals, EC detects resistance signals, DO detects nA signals, and residual chlorine detects uA signals.

[0004] The analog signal collected by the electrode is sent to the electrode acquisition card in the electrode. The electrode acquisition card sends the analog signal to the meter for processing, which requires an analog-to-digital conversion. When the meter transmits the processed data to the host computer through 4-20mA, it needs to perform another digital-to-analog conversion. For these two conversion processes, errors will occur due to the accuracy of the conversion module, and this error will seriously affect the detection accuracy. For sensors such as EC, DO, pH, and residual chlorine, it is unacceptable. The detected data needs to be detected and corrected. For this purpose, a memory and a processor are added to the meter so that the meter can record empirical data and correct the data during use. Different sensors have different types of data to be processed, and a fully functional device needs to be used for detection for different sensors, thereby reducing costs, being versatile, and convenient to use.

[0005] A detection and calibration device for water quality monitoring meters is needed that is suitable for data collection, inspection and calibration of various water quality monitoring electrodes, has high integration and is easy to use. Summary of the invention

[0006] The purpose of the present invention is to provide a detection and calibration device for a water quality monitoring meter which is suitable for data collection, inspection and calibration of various water quality monitoring electrodes, has high integration and is easy to use.

[0007] A detection and calibration device for a water quality monitoring electric meter, comprising:

[0008] A supporting shell, an industrial control screen is arranged on the side of the supporting shell, a bracket is arranged on the upper part, a clamping device is arranged on the bracket, and the clamping device drives the upper clamping plate to move linearly up and down relative to the lower clamping plate, and the lower clamping plate is provided with a through hole, and an interface is arranged in the through hole;

[0009] The industrial control panel controls the mV module, nA module, uA module, current detection 1, current detection 2, resistor 1, resistor 2, resistor 3, and input / output relay group respectively through the communication bus;

[0010] The mV module is a voltage module that can output a continuously adjustable mV voltage;

[0011] The nA module is a current module that can output a continuously adjustable nA current;

[0012] The uA module is a current module that can output a continuously adjustable uA current;

[0013] The resistor 1, resistor 2, and resistor 3 are resistor modules that can output adjustable resistance respectively;

[0014] The input / output relay group is a relay module that can input or output relay signals;

[0015] The current detection 1 and the current detection 2 are current detection modules for detecting the magnitude of current signals respectively.

[0016] The fixing block of the clamping device is fixed on the bracket, the fixing block is C-shaped, the upper part is hinged to the end of the wrench, the middle part of the hinged wrench is hinged to the connecting rod, the connecting rod is hinged to the clamping rod, the clamping rod is fixedly connected to the upper clamping plate, the upper clamping plate constrains the limit rod to move linearly up and down, the end of the limit rod is fixed to the upper part of the support shell, the lower part of the fixed block is sleeved on the clamping rod, the upper clamping plate is U-shaped, and a buffer spring is arranged under the lower clamping.

[0017] The interface includes a power supply interface, a data transmission interface, an input interface and an output interface.

[0018] The clamping device drives the upper clamping plate and the lower clamping plate to clamp the pH meter. The pH meter is connected to the resistor 1, the current detection 1, the current detection 2 and the industrial control screen through interfaces. The resistor 1 is connected to the mV module.

[0019] The industrial control screen controls the mV module to output a set mV voltage, and the industrial control screen controls resistor 1 to output a set resistance. After the mV signal passes through resistor 1, it is sent to the pH meter. The pH meter converts the received mV signal from an analog signal to a digital signal for storage, and then converts it into an analog signal and sends it to current detection 1 and current detection 2 for detection. Current detection 1 and current detection 2 send the detected analog signal values ​​to the industrial control screen through the communication bus. The industrial control screen compares the mV signal and the analog signal values, and then sends the mV signal and the analog signal values ​​to the memory inside the pH meter for storage together.

[0020] The clamping device drives the upper clamping plate and the lower clamping plate to clamp the EC meter. The EC meter is connected to resistor 1, current detection 1, current detection 2 and the industrial control panel through interfaces respectively. The resistor 1 is connected to resistor 3.

[0021] The industrial control screen controls resistor 1 to output a set resistance, and the industrial control screen controls resistor 3 to output a set resistance. After resistor 3 passes through resistor 1, it is sent to the EC meter. The EC meter converts the received resistance from an analog signal into a digital signal for storage, and then converts it into an analog signal and sends it to current detection 1 and current detection 2 for detection. Current detection 1 and current detection 2 send the detected analog signal values ​​to the industrial control screen through the communication bus. The industrial control screen compares the set resistance output by resistor 1 with the analog signal value, and then sends the set resistance output by resistor 1 and the analog signal value to the memory inside the pH meter for storage.

[0022] The clamping device drives the upper clamping plate and the lower clamping plate to clamp the residual chlorine meter. The residual chlorine meter is connected to resistor 1, current detection 1, current detection 2 and the industrial control panel through interfaces respectively. The resistor 1 is connected to the uA module.

[0023] The industrial control panel controls the uA module to output the set uA current, and the industrial control panel controls resistor 1 to output the set resistance. After the uA current passes through resistor 1, it is sent to the residual chlorine meter. The residual chlorine meter converts the received uA current from an analog signal to a digital signal for storage, and then converts it into an analog signal and sends it to current detection 1 and current detection 2 for detection. Current detection 1 and current detection 2 send the detected analog signal values ​​to the industrial control panel through the communication bus. The industrial control panel compares the uA current and the analog signal values, and then sends the uA current and the analog signal values ​​to the memory inside the pH meter for storage together.

[0024] The clamping device drives the upper clamping plate and the lower clamping plate to clamp the DO meter. The DO meter is connected to resistor 1, current detection 1, current detection 2 and the industrial control panel through interfaces. The resistor 1 is connected to the nA module.

[0025] The industrial control panel controls the nA module to output the set nA current, and the industrial control panel controls resistor 1 to output the set resistance. After the nA current passes through resistor 1, it is sent to the DO meter. The DO meter converts the received nA current from an analog signal to a digital signal for storage, and then converts it into an analog signal and sends it to current detection 1 and current detection 2 for detection. Current detection 1 and current detection 2 send the detected analog signal values ​​to the industrial control panel through the communication bus. The industrial control panel compares the nA current and the analog signal values, and then sends the nA current and the analog signal values ​​to the memory inside the pH meter for storage together.

[0026] The clamping device drives the upper clamping plate and the lower clamping plate to clamp one of the pH meter, EC meter, DO meter, and residual chlorine meter. After the industrial control panel is connected to the meter, it is connected to the input / output relay group.

[0027] The industrial control panel controls the relay output of one of the pH meter, EC meter, DO meter, and residual chlorine meter one by one. After receiving the output, the input / output relay group controls the signal light to indicate whether the relay in the meter is normal or not. The test results are sent to the industrial control panel through the communication bus.

[0028] The clamping device drives the upper clamping plate and the lower clamping plate to clamp one of the pH meter, EC meter, DO meter and residual chlorine meter. The meter is connected to the industrial control screen to sequentially enter production judgment, judge the software version, detect the instrument screen buttons, calibrate the current, calibrate the time and date, retest the current, detect the relay, enter the serial number to verify the serial number, set the language and backlight of the startup screen, and set the production status.

[0029] The clamping device drives the upper clamping plate and the lower clamping plate to clamp one of the pH meter, EC meter, DO meter and residual chlorine meter. The meter is connected to the industrial control panel to perform exclusive part calibration, exclusive part retest, temperature calibration and temperature retest in sequence.

[0030] The present invention provides an industrial control screen on the side of the support shell, a bracket is provided on the upper part, a clamping device is provided on the bracket, the clamping device drives the upper clamping plate to move linearly up and down relative to the lower clamping plate, the lower clamping plate is provided with a through hole, and an interface is provided in the through hole; the industrial control screen controls the mV module, nA module, uA module, current detection 1, current detection 2, resistor 1, resistor 2, resistor 3, and input / output relay group through a communication bus; the mV module is a voltage module that can output a continuously adjustable mV voltage; the nA module is a current module that can output a continuously adjustable nA current; the uA module is a current module that can output a continuously adjustable uA current; resistors 1, 2, and 3 are respectively resistor modules that can output adjustable resistance; the input / output relay group is a relay module that can input or output relay signals; current detection 1 and current detection 2 are respectively current detection modules that detect the size of current signals. The present invention is suitable for data acquisition inspection and calibration of various water quality monitoring electrodes, has high integration, and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a front view of the present invention;

[0032] Figure 2 is a circuit connection diagram of the present invention;

[0033] Figure 3 is a flow chart of the general part of the present invention;

[0034] Figure 4 is a flow chart of the exclusive part of the present invention;

[0035] Figure 5 It is a detection relationship diagram of the pH meter of the present invention;

[0036] Figure 6 It is a detection relationship diagram of the EC meter of the present invention;

[0037] Figure 7 It is a detection relationship diagram of the residual chlorine electric meter of the present invention;

[0038] Figure 8 It is a detection relationship diagram of the DO meter of the present invention;

[0039] Fig. 9 It is a detection relationship diagram of the relay of the present invention;

[0040] Fig.10 It is a usage relationship diagram of the prior art of the present invention;

[0041] In the figure: 1. support shell, 2. industrial control panel, 3. bracket, 4. clamping device, 5. upper clamping plate, 6. lower clamping plate, 7. interface, 41. fixing block, 42. wrench, 43. connecting rod, 44. clamping rod, 45. limit rod. DETAILED DESCRIPTION

[0042] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0043] A detection and calibration device for a water quality monitoring electric meter, comprising: a supporting shell 1, an industrial control screen 2 is arranged on the side of the supporting shell 1, a bracket 3 is arranged on the upper part, a clamping device 4 is arranged on the bracket 3, the clamping device 4 drives an upper clamping plate 5 to move linearly up and down relative to a lower clamping plate 6, the lower clamping plate 6 is provided with a through hole, and an interface 7 is arranged in the through hole; the industrial control screen 2 controls an mV module, an nA module, a uA module, a current detection 1, a current detection 2, a resistor 1, a resistor 2, a resistor 3, and an input / output relay group through a communication bus; the mV module is a voltage module that can output a continuously adjustable mV voltage; the nA module is a current module that can output a continuously adjustable nA current; the uA module is a current module that can output a continuously adjustable uA current; the resistor 1, the resistor 2, and the resistor 3 are respectively resistor modules that can output adjustable resistance; the input / output relay group is a relay module that can input or output relay signals; the current detection 1 and the current detection 2 are respectively current detection modules that detect the size of the current signal.

[0044] The fixing block 41 of the clamping device 4 is fixed on the bracket 3. The fixing block 41 is C-shaped, the upper part is hinged to the end of the wrench 42, the middle part of the hinged wrench 42 is hinged to the connecting rod 43, the connecting rod 43 is hinged to the clamping rod 44, the clamping rod 44 is fixedly connected to the upper clamping plate 5, the upper clamping plate 5 constrains the limit rod 45 to move linearly up and down, the end of the limit rod 45 is fixed to the upper part of the support shell 1, the lower part of the fixing block 41 is sleeved on the clamping rod 44, the upper clamping plate 5 is U-shaped, and a buffer spring is arranged below the lower clamping plate 6. The interface 7 includes a power interface, a data transmission interface, an input interface and an output interface.

[0045] The pressing device 4 drives the upper pressing plate 5 and the lower pressing plate 6 to press the pH meter. The pH meter is connected to the resistor 1, the current detection 1, the current detection 2 and the industrial control panel 2 through the interface 7. The resistor 1 is connected to the mV module.

[0046] Industrial control panel 2 controls the mV module to output the set mV voltage, and industrial control panel 2 controls resistor 1 to output the set resistance. After the mV signal passes through resistor 1, it is sent to the pH meter. The pH meter converts the received mV signal from an analog signal to a digital signal for storage, and then converts it into an analog signal and sends it to current detection 1 and current detection 2 for detection. Current detection 1 and current detection 2 send the detected analog signal values ​​to industrial control panel 2 through the communication bus. Industrial control panel 2 compares the mV signal and the analog signal values, and then sends the mV signal and the analog signal values ​​to the internal memory of the pH meter for storage.

[0047] For the pH meter, the output voltage is ±1900mV, ±500mV, 0mV in low resistance mode (resistance 1) for calibration. Then the output voltage is ±200mV, ±1000mV in low resistance mode (resistance 1) for re-test. Then the output voltage is ±200mV, ±1000mV in high resistance mode (resistance 1) for re-test. Resistor 1 is 1GΩ.

[0048] The clamping device 4 drives the upper clamping plate 5 and the lower clamping plate 6 to clamp the EC meter. The EC meter is connected to the resistor 1, the current detection 1, the current detection 2 and the industrial control panel 2 through the interface 7. The resistor 1 is connected to the resistor 3.

[0049] Industrial control panel 2 controls resistor 1 to output the set resistance, and industrial control panel 2 controls resistor 3 to output the set resistance. After resistor 3 passes through resistor 1, it is sent to the EC meter. The EC meter converts the received resistance from analog signal to digital signal for storage, and then converts it into analog signal and sends it to current detection 1 and current detection 2 for detection. Current detection 1 and current detection 2 send the detected analog signal value to industrial control panel 2 through the communication bus. Industrial control panel 2 compares the set resistance output by resistor 1 with the analog signal value, and then sends the set resistance output by resistor 1 and the analog signal value to the memory inside the pH meter for storage.

[0050] For EC meters, the setting value of resistor 1 is the same as pH, and the setting value of resistor 1 refers to the national standard.

[0051] The clamping device 4 drives the upper clamping plate 5 and the lower clamping plate 6 to clamp the residual chlorine meter. The residual chlorine meter is connected to the resistor 1, the current detection 1, the current detection 2 and the industrial control panel 2 through the interface 7. The resistor 1 is connected to the uA module.

[0052] Industrial control panel 2 controls the uA module to output the set uA current, and industrial control panel 2 controls resistor 1 to output the set resistance. After the uA current passes through resistor 1, it is sent to the residual chlorine meter. The residual chlorine meter converts the received uA current from an analog signal to a digital signal for storage, and then converts it into an analog signal and sends it to current detection 1 and current detection 2 for detection. Current detection 1 and current detection 2 send the detected analog signal values ​​to industrial control panel 2 through the communication bus. Industrial control panel 2 compares the uA current and analog signal values, and then sends the uA current and analog signal values ​​to the memory inside the pH meter for storage.

[0053] For the residual chlorine meter, the setting value of resistor 1 is the same as pH, the output calibration current is 0uA, 1uA, 4uA, and the retest current is 1uA.

[0054] The clamping device 4 drives the upper clamping plate 5 and the lower clamping plate 6 to clamp the DO meter. The DO meter is connected to the resistor 1, the current detection 1, the current detection 2 and the industrial control panel 2 through the interface 7. The resistor 1 is connected to the nA module.

[0055] Industrial control panel 2 controls the nA module to output the set nA current, and industrial control panel 2 controls resistor 1 to output the set resistance. After the nA current passes through resistor 1, it is sent to the DO meter. The DO meter converts the received nA current from an analog signal to a digital signal for storage, and then converts it into an analog signal and sends it to current detection 1 and current detection 2 for detection. Current detection 1 and current detection 2 send the detected analog signal values ​​to industrial control panel 2 through the communication bus. Industrial control panel 2 compares the nA current and analog signal values, and then sends the nA current and analog signal values ​​to the internal memory of the pH meter for storage.

[0056] For DO meters, the output calibration current is 0nA, 68 / 70nA, 136 / 140nA, and the retest current is 68nA. The setting value of resistor 1 is the same as pH.

[0057] The clamping device 4 drives the upper clamping plate 5 and the lower clamping plate 6 to clamp one of the pH meter, EC meter, DO meter and residual chlorine meter. After the industrial control panel 2 is connected to the meter, the input / output relay group is connected.

[0058] The industrial control panel 2 controls the relay output of one of the pH meter, EC meter, DO meter and residual chlorine meter one by one. After receiving the output, the input / output relay group controls the signal light to indicate whether the relay in the meter is normal or not. The test results are sent to the industrial control panel 2 through the communication bus.

[0059] Resistor 2 is a backup for resistor 1. Current detection 1 or current detection 2 can be selected or used simultaneously.

[0060] The clamping device 4 drives the upper clamping plate 5 and the lower clamping plate 6 to clamp one of the pH meter, EC meter, DO meter and residual chlorine meter. The meter is connected to the industrial control screen 2, and enters the production judgment, judges the software version, detects the instrument screen buttons, calibrates the current, calibrates the time and date, re-measures the current, detects the relay, enters the serial number to verify the serial number, sets the language and the backlight of the boot screen, and sets the production status.

[0061] The clamping device 4 drives the upper clamping plate 5 and the lower clamping plate 6 to clamp one of the pH meter, EC meter, DO meter, and residual chlorine meter, and the meter is connected to the industrial control panel 2 to sequentially perform exclusive part calibration, exclusive part retest, temperature calibration, and temperature retest. Exclusive part calibration is for meters with temperature compensation function.

[0062] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A detection and calibration device for water quality monitoring electric meter, characterized in that: include: A support shell (1), an industrial control screen (2) is arranged on the side of the support shell (1), a bracket (3) is arranged on the upper part, a clamping device (4) is arranged on the bracket (3), the clamping device (4) drives the upper clamping plate (5) to move linearly up and down relative to the lower clamping plate (6), the lower clamping plate (6) is provided with a through hole, and an interface (7) is arranged in the through hole; The industrial control panel (2) controls the mV module, the nA module, the uA module, the current detection 1, the current detection 2, the resistor 1, the resistor 2, the resistor 3, and the input / output relay group respectively through the communication bus; The mV module is a voltage module that can output a continuously adjustable mV voltage; The nA module is a current module that can output a continuously adjustable nA current; The uA module is a current module that can output a continuously adjustable uA current; The resistor 1, resistor 2, and resistor 3 are resistor modules that can output adjustable resistance respectively; The input / output relay group is a relay module that can input or output relay signals; The current detection 1 and current detection 2 are current detection modules for detecting the magnitude of current signals respectively; The fixing block (41) of the clamping device (4) is fixed on the bracket (3), the fixing block (41) is C-shaped, the upper part is hinged to the end of the wrench (42), the middle part of the hinged wrench (42) is hinged to the connecting rod (43), the connecting rod (43) is hinged to the clamping rod (44), the clamping rod (44) is fixedly connected to the upper clamping plate (5), the upper clamping plate (5) constrains the limit rod (45) to move linearly up and down, the end of the limit rod (45) is fixed to the upper part of the support shell (1), the lower part of the fixing block (41) is sleeved on the clamping rod (44), the upper clamping plate (5) is U-shaped, and a buffer spring is arranged below the lower clamping plate (6); The interface (7) comprises a power supply interface, a data transmission interface, an input interface and an output interface; The pressing device (4) drives the upper pressing plate (5) and the lower pressing plate (6) to press the pH meter, and the pH meter is connected to the resistor 1, the current detection 1, the current detection 2 and the industrial control panel (2) respectively through the interface (7), and the resistor 1 is connected to the mV module; The clamping device (4) drives the upper clamping plate (5) and the lower clamping plate (6) to clamp the EC meter. The EC meter is connected to the resistor 1, the current detection 1, the current detection 2 and the industrial control panel (2) through the interface (7). The resistor 1 is connected to the resistor 3. The pressing device (4) drives the upper pressing plate (5) and the lower pressing plate (6) to press the residual chlorine meter, and the residual chlorine meter is respectively connected to the resistor 1, the current detection 1, the current detection 2 and the industrial control panel (2) through the interface (7), and the resistor 1 is connected to the uA module; The pressing device (4) drives the upper pressing plate (5) and the lower pressing plate (6) to press the DO meter, and the DO meter is connected to the resistor 1, the current detection 1, the current detection 2 and the industrial control panel (2) through the interface (7), and the resistor 1 is connected to the nA module; The clamping device (4) drives the upper clamping plate (5) and the lower clamping plate (6) to clamp one of the pH meter, the EC meter, the DO meter, and the residual chlorine meter. After the industrial control panel (2) is connected to the meter, it is connected to the input / output relay group.

2. A detection and calibration device for a water quality monitoring electric meter according to claim 1, characterized in that: The clamping device (4) drives the upper clamping plate (5) and the lower clamping plate (6) to clamp one of the pH meter, EC meter, DO meter, and residual chlorine meter. The meter is connected to the industrial control panel (2) to sequentially enter production judgment, judge the software version, detect the instrument screen buttons, calibrate the current, calibrate the time and date, retest the current, detect the relay, enter the serial number to verify the serial number, set the language and backlight of the startup screen, and set the production status.

3. A detection and calibration device for a water quality monitoring electric meter according to claim 1, characterized in that: The pressing device (4) drives the upper pressing plate (5) and the lower pressing plate (6) to press one of the pH meter, the EC meter, the DO meter, and the residual chlorine meter, and the meter is connected to the industrial control panel (2) to sequentially perform exclusive part calibration, exclusive part retest, temperature calibration, and temperature retest.

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