CN115932394A - PH electrode internal resistance detection device - Google Patents
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Abstract
The invention relates to a pH electrode internal resistance detection device, which is characterized in that the number of detection channels is more than one, the detection channels are connected with a signal acquisition module, the signal acquisition module is connected with an MCU (microprogrammed control unit), the MCU is connected with a configuration screen through RS485 communication, and the configuration screen is connected with a cloud platform; the temperature voltage conversion module of the detection channel is connected with the signal acquisition module, the external resistance module of the detection channel is connected with the MCU, the pH voltage conversion module is respectively connected with the signal acquisition module and the pH electrode, and the external resistance module is connected between the pH electrode and the pH voltage conversion module; the configuration screen controls Rs in the external resistance module not to be connected to the pH voltage conversion module in parallel through the MCU, the signal acquisition module acquires voltage signals of the temperature voltage conversion module and the pH voltage conversion module and sends the voltage signals to the MCU, and then voltage E1 is calculated; the configuration screen controls Rs in the external resistance module to be connected to the pH voltage conversion module in parallel through the MCU. The invention can simplify the internal resistance testing process, reduce the labor, improve the production progress and have the recording function.
Description
Technical Field
The invention relates to the technical field of water quality monitoring electrodes, in particular to a pH electrode internal resistance detection device which can simplify an internal resistance test flow, reduce labor, improve production progress and has a recording function.
Background
A pH electrode, namely a pH value electrode, namely a part of the pH meter contacted with a tested substance, and a device for detecting the potential of the electrode. The internal resistance is an important parameter of the pH electrode, is mainly related to factors such as the composition of a membrane material, the thickness of the membrane, the temperature and the like, and has a great relationship with the current temperature value. The internal resistance of the glass electrode has great influence on the stability of the pH test, the pH meter is required to have very high input impedance, and when the internal resistance of the pH electrode is overlarge, the display of the meter can drift, shake and be unstable, so that the electrode generates polarization and the test precision is seriously influenced. The requirement is that the internal resistance of the pH electrode is measured when the production is finished, and the quality of the product is controlled by inductive statistics, so that the qualification rate of the product is improved.
The detection method of the internal resistance of the pH sensor comprises the following steps: the pH sensor was immersed in a standard buffer solution B4 (pH value of the standard buffer solution B4 at a predetermined temperature, 4.003pH at 25 ℃ and 4.087pH at 60 ℃) to connect to a pH meter, and the pH sensor was connected in parallel to a 100 M.OMEGA.resistance and similarly connected to the pH meter to measure a detection voltage E2. Because the yield of the pH electrode is huge, the current production testing means of the internal resistance of the pH electrode has the disadvantages of slow speed, complex flow, and large amount of labor and energy for testing, and is not suitable for the current production requirement.
There is a need for a pH electrode internal resistance detection device with a recording function that can simplify the internal resistance testing process, reduce labor, improve production progress.
Disclosure of Invention
The invention aims to provide a pH electrode internal resistance detection device which can simplify the internal resistance test process, reduce the labor, improve the production progress and has the recording function.
A pH electrode internal resistance detection device comprising:
the system comprises detection channels, a signal acquisition module, an MCU (micro controller unit), a configuration screen and a cloud platform, wherein the number of the detection channels is more than one, the detection channels are connected with the signal acquisition module, the signal acquisition module is connected with the MCU, the MCU is connected with the configuration screen through RS485 communication, and the configuration screen is connected with the cloud platform;
the temperature voltage conversion module of the detection channel is connected with the signal acquisition module, the external resistance module of the detection channel is connected with the MCU, the pH voltage conversion module is respectively connected with the signal acquisition module and the pH electrode, and the external resistance module is connected between the pH electrode and the pH voltage conversion module;
the configuration screen controls Rs in the external resistance module not to be connected to the pH voltage conversion module in parallel through the MCU, the signal acquisition module acquires voltage signals of the temperature voltage conversion module and the pH voltage conversion module and sends the voltage signals to the MCU, and then voltage E1 is calculated;
the configuration screen controls Rs in the external resistance module to be connected to the pH voltage conversion module in parallel through the MCU, the signal acquisition module acquires voltage signals of the external resistance module, the temperature voltage conversion module and the pH voltage conversion module and sends the voltage signals to the MCU, and then voltage E2 is calculated;
according to
Wherein: rs is known within the external resistor block,
the MCU can calculate Re.
The resistance R4 of pH voltage conversion module connects pH electrode, rs0 interface, electric capacity C1, comparator U1's 3 rd interface respectively, electric capacity C1 ground connection, U1's 1 st interface connects U1's 2 nd interface and resistance R3 respectively, resistance R3 is connecting resistance R1, electric capacity C2 respectively, comparator U2's 3 rd interface, electric capacity C2 ground connection, resistance R1 connects the VREF interface, U2's the 2 nd interface of connecting U2 respectively and resistance R2, electric capacity C3 and passageway 0 interface are connected respectively to resistance R2, electric capacity C3 ground connection.
The 3 rd interface connection Rs0 interface of switch U7 of external resistance module, ground connection behind the 4 th interface connection resistance R5 of U7, the 1 st interface connection VCC interface of U7, resistance R5 is Rs in the external resistance module, the 2 nd interface connection digital transistor Q1's of U7 2 interface connection 2 interface, Q1's the 1 st interface ground connection, Q1's the 2 nd interface connection GOIO1 interface.
Temperature voltage conversion module's temperature sensitive resistance RT one end ground connection, the 3 rd interface of the other end difference connecting resistance R6, electric capacity C4, comparator U3, electric capacity C4 ground connection, VREF interface is connected to resistance R6, U3's the 1 st interface and resistance R7 of U3 are connected respectively to the 2 nd interface, electric capacity C5 and the interface of passageway are connected respectively to resistance R7, electric capacity C5 ground connection.
The signal acquisition module is ADC converter U4, U4 passes through IIC communication connection MCU, set up 0 interface of passageway, 1 interface of passageway, 2 interfaces of passageway, 3 interfaces of passageway on U4, MCU is last to set up GPIO1 interface, GPIO2 interface, VREF interface, MCU's TX interface connection RS485 communication U6's the 1 st interface, MCU's EN interface connection U6's the 2 nd interface and U6's the 3 rd interface, MCU's RX interface connection U6's the 4 th interface, U6's the 8 th interface connection VCC interface, U6's the 5 th interface ground connection, U6's the 6 th interface and U6's the 7 th interface are connected the configuration screen respectively.
The number of the detection channels is two, and the detection channels are respectively detection channel 1 and detection channel 2, the detection channels 1 and detection channel 2 are respectively connected with the pH electrode, the signal acquisition module is ADC converter U4, the detection channels 1 are respectively connected with channel 0 interface and channel 1 interface of U4, and the detection channels 2 are respectively connected with channel 2 interface and channel 3 interface of U4.
The configuration screen is a touch screen and is connected with the cloud platform in a wireless and/or limited mode.
The configuration screen controls Rs in the external resistance module not to be connected to the pH voltage conversion module in parallel through the MCU, when the switch is turned on, the Rs in the external resistance module is not connected, the Rs is the resistor R5, and the configuration screen waits for one minute and reads E1;
the configuration screen controls Rs in the external resistance module to be connected to the pH voltage conversion module in parallel through the MCU, when the switch is closed, the Rs in the external resistance module is connected, one minute is waited, and E2 is read; ,
the MCU calculates internal resistance Re, the internal resistance Re is sent to a configuration screen for display, the internal resistance Re is smaller than a set value, the judgment is qualified, and the recording is carried out when the internal resistance Re is qualified;
and re-testing once for every two disqualified products, and recording the pH electrode as disqualified.
The number of the detection channels is more than one, the detection channels are connected with a signal acquisition module, the signal acquisition module is connected with an MCU (microprogrammed control unit), the MCU is connected with a configuration screen through RS485 communication, and the configuration screen is connected with a cloud platform; the temperature voltage conversion module of the detection channel is connected with the signal acquisition module, the external resistance module of the detection channel is connected with the MCU, the pH voltage conversion module is respectively connected with the signal acquisition module and the pH electrode, and the external resistance module is connected between the pH electrode and the pH voltage conversion module; the configuration screen controls Rs in the external resistance module not to be connected to the pH voltage conversion module in parallel through the MCU, the signal acquisition module acquires voltage signals of the temperature voltage conversion module and the pH voltage conversion module and sends the voltage signals to the MCU, and then voltage E1 is calculated; the configuration screen controls Rs in the external resistance module to be connected to the pH voltage conversion module in parallel through the MCU, the signal acquisition module acquires voltage signals of the external resistance module, the temperature voltage conversion module and the pH voltage conversion module and sends the voltage signals to the MCU, and then voltage E2 is calculated; the MCU can calculate Re. The invention can simplify the internal resistance testing process, reduce the labor, improve the production progress and have the recording function.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the structure of a detection channel according to the present invention;
FIG. 3 is a schematic diagram of the detection of the present invention;
FIG. 4 is a flow chart of the detection of the present invention;
FIG. 5 is a circuit diagram of a pH voltage conversion module of the present invention;
FIG. 6 is a circuit diagram of the external resistance module of the present invention;
FIG. 7 is a circuit diagram of the temperature to voltage conversion module of the present invention;
fig. 8 is a circuit diagram at the MCU of the present invention.
Detailed Description
The invention is further described below with reference to the following figures and specific examples.
A pH electrode internal resistance detection device comprising:
the system comprises detection channels, a signal acquisition module, an MCU (micro controller unit), a configuration screen and a cloud platform, wherein the number of the detection channels is more than one, the detection channels are connected with the signal acquisition module, the signal acquisition module is connected with the MCU, the MCU is connected with the configuration screen through RS485 communication, and the configuration screen is connected with the cloud platform;
the temperature voltage conversion module of the detection channel is connected with the signal acquisition module, the external resistance module of the detection channel is connected with the MCU, the pH voltage conversion module is respectively connected with the signal acquisition module and the pH electrode, and the external resistance module is connected between the pH electrode and the pH voltage conversion module;
the configuration screen controls Rs in the external resistance module not to be connected to the pH voltage conversion module in parallel through the MCU, the signal acquisition module acquires voltage signals of the temperature voltage conversion module and the pH voltage conversion module and sends the voltage signals to the MCU, and then voltage E1 is calculated;
the configuration screen controls Rs in the external resistance module to be connected to the pH voltage conversion module in parallel through the MCU, the signal acquisition module acquires voltage signals of the external resistance module, the temperature voltage conversion module and the pH voltage conversion module and sends the voltage signals to the MCU, and then voltage E2 is calculated;
according to
Wherein: rs is known within the external resistor block,
the MCU can calculate Re.
Resistance R4 of pH voltage conversion module connects pH electrode, rs0 interface, electric capacity C1, comparator U1's 3 rd interface respectively, electric capacity C1 ground connection, U1's 1 st interface connects U1's 2 nd interface and resistance R3 respectively, resistance R3 connects resistance R1, electric capacity C2 respectively, comparator U2's 3 rd interface, electric capacity C2 ground connection, resistance R1 connects the VREF interface, U2's the 2 nd interface connects U2's 1 st interface and resistance R2 respectively, electric capacity C3 and the 0 interface of passageway are connected respectively to resistance R2, electric capacity C3 ground connection.
The 3 rd interface connection Rs0 interface of switch U7 of external resistance module, ground connection behind the 4 th interface connection resistance R5 of U7, the 1 st interface connection VCC interface of U7, resistance R5 is Rs in the external resistance module, the 2 nd interface connection digital transistor Q1's of U7 2 interface connection 2 interface, Q1's the 1 st interface ground connection, Q1's the 2 nd interface connection GOIO1 interface.
Temperature voltage conversion module's temperature sensitive resistance RT one end ground connection, the 3 rd interface of the other end difference connecting resistance R6, electric capacity C4, comparator U3, electric capacity C4 ground connection, VREF interface is connected to resistance R6, U3's the 1 st interface and resistance R7 of U3 are connected respectively to the 2 nd interface, electric capacity C5 and the interface of passageway are connected respectively to resistance R7, electric capacity C5 ground connection.
The signal acquisition module is ADC converter U4, U4 passes through IIC communication connection MCU, set up 0 interface of passageway, 1 interface of passageway, 2 interfaces of passageway, 3 interfaces of passageway on U4, MCU is last to set up GPIO1 interface, GPIO2 interface, VREF interface, MCU's TX interface connection RS485 communication U6's the 1 st interface, MCU's EN interface connection U6's the 2 nd interface and U6's the 3 rd interface, MCU's RX interface connection U6's the 4 th interface, U6's the 8 th interface connection VCC interface, U6's the 5 th interface ground connection, U6's the 6 th interface and U6's the 7 th interface are connected the configuration screen respectively.
The number of the detection channels is two, and the detection channels are respectively detection channel 1 and detection channel 2, the detection channels 1 and detection channel 2 are respectively connected with the pH electrode, the signal acquisition module is ADC converter U4, the detection channels 1 are respectively connected with channel 0 interface and channel 1 interface of U4, and the detection channels 2 are respectively connected with channel 2 interface and channel 3 interface of U4.
The configuration screen is a touch screen and is connected with the cloud platform in a wireless and/or limited mode.
The configuration screen controls Rs in the external resistance module not to be connected to the pH voltage conversion module in parallel through the MCU, when the switch is turned on, the Rs in the external resistance module is not connected, the Rs is the resistor R5, and the configuration screen waits for one minute and reads E1;
the configuration screen controls Rs in the external resistance module to be connected to the pH voltage conversion module in parallel through the MCU, when the switch is closed, the Rs in the external resistance module is connected, one minute is waited, and E2 is read; ,
the MCU calculates internal resistance Re, the internal resistance Re is sent to a configuration screen for display, the internal resistance Re is smaller than a set value, the judgment is qualified, and the recording is carried out when the internal resistance Re is qualified;
and re-testing once for every two disqualified products, and recording the pH electrode as disqualified.
The principle of measuring the internal resistance of the electrode in the current production test process is to divide the voltage by connecting large resistors in parallel, and the internal resistance of the electrode is calculated by measuring the voltage difference before and after the large resistors are added to the electrode. The principle formula is as follows:
where Re is the internal resistance (in mega ohm) of the electrode to be tested, E1 is the voltage value (in millivolt) measured by the pH electrode when the large resistor is not incorporated, E2 is the voltage value (in millivolt) measured by the pH electrode when the large resistors are connected in parallel, and Rs is the external contact resistance (in mega ohm) used in production test.
A multi-channel highly-integrated pH electrode internal resistance detection device can independently measure the internal resistance of an electrode by two channels without mutual interference (not limited to the two channels), and display the measured voltage and the internal resistance of the electrode; meanwhile, because the current temperature value has great influence on the internal resistance of the electrode, the device can measure and display the current temperature compensation type and the temperature value of the corresponding pH meter. The device achieves the purpose of simplifying production test flow, reduces labor cost and improves production speed.
Through the Internet of things transmission module of the cloud platform, the internal resistance Re condition of the electrode of each test is recorded in real time and numbered, and the serial number is uploaded to the cloud platform, so that the current test state and the overall qualification rate can be checked and counted in real time. The product delivery data is increased, and the product quality control is improved. Meanwhile, the pH electrode internally comprises a temperature sensor, a temperature-voltage conversion circuit is designed for judging the type of the temperature sensor, data are transmitted to the MCU through the temperature-voltage conversion circuit and the ADC, the type of the sensor is judged through a program in the MCU, and the judged result is sent to a screen for recording and storing through RS 485. And the performance detection of the pH sensor is realized.
The pH electrode internal resistance detection device is provided with two detection channels, and can be used for simultaneously detecting the temperature resistance and the voltage of two pH electrodes. The signal acquisition module acquires data of the two detection channels, communicates with the main chip MCU through I2C communication, and transmits the data to the MCU. The MCU is connected with the configuration screen through RS485 communication, data are displayed on the configuration screen, and the configuration screen can also control the process of production test and control whether to access an external resistor to analyze the internal resistance of the pH electrode. The configuration screen is connected with the cloud platform through the wireless transmission module, and test data are uploaded to the cloud in real time and recorded.
In order to improve the production test efficiency, the measuring device has two paths which are a detection channel I and a detection channel II and respectively detect a pH electrode; each detection channel occupies two signal acquisition module channels, one path of the detection channel detects a temperature resistor to read the current electrode temperature, and the other path of the detection channel detects a pH voltage value to analyze the internal resistance of the pH electrode.
Taking the detection channel 1 as an example, the pH voltage conversion circuit is responsible for detecting the current voltage value of the pH meter, and the temperature voltage conversion circuit is responsible for measuring the current temperature resistance, and further converting the current temperature into the current temperature. The configuration screen sends an instruction to the MCU to control the opening and closing of the control switch 1, the control switch 1 is opened, the pH voltage conversion circuit directly reads a millivolt value without an external resistor Rs, then the control switch 1 is closed, the pH voltage conversion circuit reads the millivolt value with the external resistor Rs, and the pH voltage conversion circuit reads the millivolt value with the external resistor Rs.
In the process of testing the internal resistance of the pH electrode, the millivolt values of the parallel resistance and the non-parallel resistance need to be measured, and because the pH meter needs to be placed for about one minute to achieve stability in the process of measuring the millivolt values, when the internal resistance test is manually carried out, manual timing is needed for many times when one pH electrode is measured, and the process is very complicated. Therefore, the purpose of flow automation is achieved by using the configuration screen, after the production test is started by clicking, the program of the configuration screen automatically controls the MCU to turn on and turn off the control switch, and the automatic test of the internal resistance of the pH electrode is further realized.
A detection channel 1 in the automatic production test flow is characterized in that a control switch 1 is firstly turned on, namely a switch U7 is turned on, one minute is waited, the millivolt value E1 collected by a pH meter is recorded, then the control switch 1 is turned off, one minute is waited, the millivolt value E2 collected by the pH meter is recorded, then the current pH value internal resistance is calculated, whether the production requirement is met or not is judged, a finished product is recorded and a serial number is uploaded if the production requirement is met, if the finished product is not met, the finished product is recorded and tested again, and if the finished product is not met, a second test is not met, a defective product is directly recorded and the serial number is uploaded. The whole process is implemented by the MCU controlled by the program in the configuration screen, and an operator only needs to access the electrode, thereby greatly simplifying the operation process.
When the GPIO1 of the relay control pin outputs a high level, the relay closing resistor R5 (100M omega) and a pH sensor signal are connected in parallel to enter a pH voltage conversion unit, the collected voltage signal is converted into a digital signal through ads1115, and the acquired digital signal is transmitted to the MCU through the manner of IIC communication by the ads1115 (the ads115 is an ADC chip of an IIC communication 16-bit 4-channel). And after the MCU internal program processes the data, transmitting the internal resistance information of the pH sensor to a screen for recording and storing in an RS485 communication mode. Meanwhile, the temperature sensor RT is connected to a temperature voltage conversion circuit, the divided voltage passes through ads1115 through a resistor series voltage division principle, then the ads1115 transmits data to the MCU in an IIC communication mode, and the MCU judges the type of the sensor through data program calculation. And similarly, the MCU transmits the information of the temperature sensor to a screen for recording and storing in an RS485 communication mode.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A pH electrode internal resistance detection device is characterized by comprising:
the system comprises detection channels, a signal acquisition module, an MCU (micro controller unit), a configuration screen and a cloud platform, wherein the number of the detection channels is more than one, the detection channels are connected with the signal acquisition module, the signal acquisition module is connected with the MCU, the MCU is connected with the configuration screen through RS485 communication, and the configuration screen is connected with the cloud platform;
the temperature voltage conversion module of the detection channel is connected with the signal acquisition module, the external resistance module of the detection channel is connected with the MCU, the pH voltage conversion module is respectively connected with the signal acquisition module and the pH electrode, and the external resistance module is connected between the pH electrode and the pH voltage conversion module;
the configuration screen controls Rs in the external resistance module not to be connected to the pH voltage conversion module in parallel through the MCU, the signal acquisition module acquires voltage signals of the temperature voltage conversion module and the pH voltage conversion module and sends the voltage signals to the MCU, and then voltage E1 is calculated;
the configuration screen controls Rs in the external resistance module to be connected to the pH voltage conversion module in parallel through the MCU, the signal acquisition module acquires voltage signals of the external resistance module, the temperature voltage conversion module and the pH voltage conversion module and sends the voltage signals to the MCU, and then voltage E2 is calculated;
according to
Wherein: rs is known within the external resistor block,
the MCU can calculate Re.
2. The pH electrode internal resistance detection device according to claim 1, wherein a resistor R4 of the pH voltage conversion module is connected with a pH electrode, an rs0 interface, a capacitor C1 and a 3 rd interface of a comparator U1 respectively, the capacitor C1 is grounded, a 1 st interface of the U1 is connected with a 2 nd interface of the U1 and a resistor R3 respectively, the resistor R3 is connected with a resistor R1, a capacitor C2 and a 3 rd interface of the comparator U2 respectively, the capacitor C2 is grounded, the resistor R1 is connected with a VREF interface, a 2 nd interface of the U2 is connected with a 1 st interface of the U2 and a resistor R2 respectively, the resistor R2 is connected with a capacitor C3 and a channel 0 interface respectively, and the capacitor C3 is grounded.
3. The pH electrode internal resistance detection device according to claim 1, wherein the 3 rd interface of the switch U7 of the external resistance module is connected to the Rs0 interface, the 4 th interface of the U7 is connected to the resistance R5 and then grounded, the 1 st interface of the U7 is connected to the VCC interface, the resistance R5 is the Rs in the external resistance module, the 2 nd interface of the U7 is connected to the 2 nd interface of the digital transistor Q1, the 1 st interface of the Q1 is grounded, and the 2 nd interface of the Q1 is connected to the GOIO1 interface.
4. The pH electrode internal resistance detection device according to claim 1, wherein one end of a temperature-sensitive resistor RT of the temperature-voltage conversion module is grounded, the other end of the temperature-sensitive resistor RT is respectively connected with a resistor R6, a capacitor C4 and a 3 rd interface of a comparator U3, the capacitor C4 is grounded, the resistor R6 is connected with a VREF interface, a 2 nd interface of the U3 is respectively connected with a 1 st interface and a resistor R7 of the U3, the resistor R7 is respectively connected with a capacitor C5 and a channel 1 interface, and the capacitor C5 is grounded.
5. The pH electrode internal resistance detection device according to claim 1, wherein the signal acquisition module is an ADC converter U4, the U4 is connected with an MCU through IIC communication, a channel 0 interface, a channel 1 interface, a channel 2 interface and a channel 3 interface are arranged on the U4, the MCU is provided with a GPIO1 interface, a GPIO2 interface and a VREF interface, a TX interface of the MCU is connected with a 1 st interface of an RS485 communication U6, an EN interface of the MCU is connected with a 2 nd interface of the U6 and a 3 rd interface of the U6, an RX interface of the MCU is connected with a 4 th interface of the U6, an 8 th interface of the U6 is connected with a VCC interface, a 5 th interface of the U6 is grounded, and a 6 th interface of the U6 and a 7 th interface of the U6 are respectively connected with a configuration screen.
6. The pH electrode internal resistance detection device according to claim 1, wherein the number of the detection channels is two, and the detection channels are respectively a detection channel 1 and a detection channel 2, the detection channel 1 and the detection channel 2 are respectively connected with the pH electrode, the signal acquisition module is an ADC (analog to digital converter) U4, the detection channel 1 is respectively connected with a channel 0 interface and a channel 1 interface of the U4, and the detection channel 2 is respectively connected with a channel 2 interface and a channel 3 interface of the U4.
7. The pH electrode internal resistance detection device according to claim 1, wherein the configuration screen is a touch screen, and the configuration screen is connected with a cloud platform wirelessly and/or in a limited manner.
8. The pH electrode internal resistance detection device according to claim 1, wherein the configuration screen controls Rs in the external resistance module not to be connected in parallel to the pH voltage conversion module through the MCU, when the switch U7 is opened, the Rs in the external resistance module is not connected, the Rs is a resistor R5, and after one minute, E1 is read;
the configuration screen controls Rs in the external resistance module to be connected to the pH voltage conversion module in parallel through the MCU, when the switch is closed, the Rs in the external resistance module is connected, one minute is waited, and E2 is read; ,
the MCU calculates internal resistance Re, the internal resistance Re is sent to a configuration screen for display, the internal resistance Re is smaller than a set value, the judgment is qualified, and the recording is carried out when the internal resistance Re is qualified;
and re-testing once and two unqualified pH electrodes, and recording the pH electrode as unqualified pH electrodes.
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| CN206431080U (en) * | 2016-12-30 | 2017-08-22 | 杭州联测自动化技术有限公司 | A kind of pen type pH value detector |
| CN114813864A (en) * | 2022-03-25 | 2022-07-29 | 上海博取仪器有限公司 | Data acquisition module for pH and dissolved oxygen |
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