CN110646678A - Conductivity measuring device - Google Patents
Conductivity measuring device Download PDFInfo
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- CN110646678A CN110646678A CN201910958642.5A CN201910958642A CN110646678A CN 110646678 A CN110646678 A CN 110646678A CN 201910958642 A CN201910958642 A CN 201910958642A CN 110646678 A CN110646678 A CN 110646678A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/22—Measuring resistance of fluids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
- G01N27/07—Construction of measuring vessels; Electrodes therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
Abstract
The invention discloses a conductivity measuring device, wherein a cell body is used for placing a measured liquid, a voltage part is connected with a first electrode and a second electrode and is used for applying voltage to the measured liquid in the cell body through the first electrode and the second electrode, and a current output circuit is connected with the first electrode and the second electrode and is used for collecting the current of the measured liquid in the cell body through the first electrode and the second electrode and transmitting the obtained current signal to a data processing part; the voltage output circuit is connected with the third electrode and the fourth electrode and is used for collecting the voltage of the liquid to be detected in the cell body through the third electrode and the fourth electrode and transmitting the obtained voltage signal to the data processing part; the data processing part is used for calculating the conductivity measurement result of the measured liquid according to the obtained voltage signal and current signal. The conductivity measuring device adopts a four-electrode type, can synchronously acquire voltage signals and current signals, further calculates the conductivity result of the measured liquid, and can improve the conductivity measuring precision compared with the prior art.
Description
Technical Field
The invention relates to the technical field of conductivity measurement, in particular to a conductivity measurement device.
Background
The conductivity sensor is used for measuring the conductivity of liquid, is a very important technology in the field of engineering technology research, is widely applied to human production and life, becomes an essential detection and monitoring device in industrial production and technical development such as electric power, chemical industry, environmental protection, food, semiconductor industry, ocean research and development and the like, and can be used for measuring and detecting industrial production water, human life water, seawater characteristics, electrolyte properties in batteries and the like.
The conductivity sensor may be classified into an electrode type conductivity sensor, an inductance type conductivity sensor, and an ultrasonic conductivity sensor according to a measurement principle and method. The electrode type conductivity sensor adopts a resistance measurement method according to the electrolytic conduction principle to measure the conductivity, and a measurement electrode of the electrode type conductivity sensor is represented as a complex electrochemical system in the measurement process. The inductive conductivity sensor measures the conductivity of the liquid according to the electromagnetic induction principle, and the ultrasonic conductivity sensor measures the conductivity according to the change of ultrasonic waves in the liquid. Of which the two sensors were most widely used in the past.
In the measurement process of the above-mentioned various conventional conductivity sensors, a voltage is applied to a conductivity cell, and in the process, the voltage is collected first, then a current is collected, and the conductivity is calculated according to the collected voltage and current, and the collected voltage and the collected current are not performed synchronously, so that the measurement accuracy of the conductivity is not high.
Disclosure of Invention
The invention aims to provide a conductivity measuring device which can improve the conductivity measuring precision.
In order to achieve the purpose, the invention provides the following technical scheme:
a conductivity measuring device comprises a cell body, a first electrode, a second electrode, a third electrode, a fourth electrode, a voltage part, a current output circuit, a voltage output circuit and a data processing part;
the cell body is used for placing a liquid to be measured, the voltage part is connected with the first electrode and the second electrode and is used for applying voltage to the liquid to be measured in the cell body through the first electrode and the second electrode, and the current output circuit is connected with the first electrode and the second electrode and is used for collecting the current of the liquid to be measured in the cell body through the first electrode and the second electrode and transmitting the obtained current signal to the data processing part;
the voltage output circuit is connected with the third electrode and the fourth electrode and is used for collecting the voltage of the liquid to be detected in the cell body through the third electrode and the fourth electrode and transmitting the obtained voltage signal to the data processing part;
and the data processing part is used for calculating the conductivity measurement result of the measured liquid according to the obtained voltage signal and current signal.
Preferably, the voltage part is specifically configured to apply a positive voltage to the measured liquid in the cell body through the first electrode and the second electrode for a preset time period, and then apply a negative voltage to the measured liquid in the cell body through the first electrode and the second electrode for the preset time period.
Preferably, the data processing unit is specifically configured to average a voltage signal acquired when a positive voltage is applied to the liquid to be measured and a voltage signal acquired when a negative voltage is applied to the liquid to be measured, average a current signal acquired when a positive voltage is applied to the liquid to be measured and a current signal acquired when a negative voltage is applied to the liquid to be measured, and calculate the result of measuring the conductivity of the liquid to be measured based on the voltage value and the current value obtained by averaging.
Preferably, the voltage of the positive voltage output by the voltage part is adjustable, and the voltage of the negative voltage output by the voltage part is adjustable.
Preferably, the current output circuit comprises a current-voltage conversion circuit, a first amplification circuit and an analog-to-digital converter which are connected in sequence;
the current-voltage conversion circuit is used for converting the acquired current signals into voltage signals;
the first amplifying circuit is used for amplifying the obtained voltage signal;
the analog-to-digital converter is used for performing analog-to-digital conversion on the voltage signal and transmitting the converted signal to the data processing part.
Preferably, the current output circuit further includes:
the first filter is used for filtering noise of the voltage signal output by the current-voltage conversion circuit and transmitting the processed voltage signal to the first amplifying circuit;
and the first filter circuit is used for filtering the voltage signal output by the first amplifying circuit and transmitting the processed voltage signal to the analog-to-digital converter.
Preferably, the voltage output circuit comprises a differential input circuit, a second amplifying circuit and an analog-to-digital converter which are connected in sequence;
the differential input circuit is used for carrying out differential processing on the acquired voltage signals;
the second amplifying circuit is used for amplifying the obtained voltage signal;
the analog-to-digital converter is used for performing analog-to-digital conversion on the voltage signal and transmitting the converted signal to the data processing part.
Preferably, the voltage output circuit further includes:
the second filter is used for filtering noise of the voltage signal output by the differential input circuit and transmitting the processed voltage signal to the second amplifying circuit;
and the second filter circuit is used for filtering the voltage signal output by the second amplifying circuit and transmitting the processed voltage signal to the analog-to-digital converter.
Preferably, a discharge circuit is further included for discharging the electrode.
Preferably, the data processing unit is further configured to adjust a gain multiple of the current output circuit or the voltage output circuit according to a currently obtained conductivity measurement result and strength of the acquired analog signal.
According to the technical scheme, the conductivity measuring device provided by the invention is characterized in that the measured liquid is placed in the cell body, the voltage part applies voltage to the measured liquid in the cell body through the first electrode and the second electrode, the current output circuit collects the current of the measured liquid in the cell body through the first electrode and the second electrode and transmits an obtained current signal to the data processing part, the voltage output circuit collects the voltage of the measured liquid in the cell body through the third electrode and the fourth electrode and transmits an obtained voltage signal to the data processing part, and the data processing part calculates the conductivity measuring result of the measured liquid according to the obtained voltage signal and current signal.
The conductivity measuring device adopts the four-wire electrode for measurement, can synchronously acquire the voltage signal and the current signal, further calculates the conductivity result of the measured liquid, can overcome the defects in the prior art, and can improve the conductivity measurement precision.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of a conductivity measuring apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a current output circuit according to an embodiment of the present invention;
FIG. 3 is a diagram of a voltage output circuit according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a conductivity measuring device, which comprises a cell body, a first electrode, a second electrode, a third electrode, a fourth electrode, a voltage part, a current output circuit, a voltage output circuit and a data processing part, wherein the cell body is provided with a first electrode and a second electrode;
the cell body is used for placing a liquid to be measured, the voltage part is connected with the first electrode and the second electrode and is used for applying voltage to the liquid to be measured in the cell body through the first electrode and the second electrode, and the current output circuit is connected with the first electrode and the second electrode and is used for collecting the current of the liquid to be measured in the cell body through the first electrode and the second electrode and transmitting the obtained current signal to the data processing part;
the voltage output circuit is connected with the third electrode and the fourth electrode and is used for collecting the voltage of the liquid to be detected in the cell body through the third electrode and the fourth electrode and transmitting the obtained voltage signal to the data processing part;
and the data processing part is used for calculating the conductivity measurement result of the measured liquid according to the obtained voltage signal and current signal.
The conductivity measuring device of the embodiment is characterized in that a measured liquid is placed in a cell body, a voltage part applies voltage to the measured liquid in the cell body through a first electrode and a second electrode, a current output circuit collects current of the measured liquid in the cell body through the first electrode and the second electrode and transmits an obtained current signal to a data processing part, a voltage output circuit collects voltage of the measured liquid in the cell body through a third electrode and a fourth electrode and transmits an obtained voltage signal to the data processing part, and the data processing part calculates a conductivity measuring result of the measured liquid according to the obtained voltage signal and the obtained current signal.
The conductivity measuring device of the embodiment adopts the four-wire electrode for measurement, can synchronously acquire the voltage signal and the current signal, further calculates the conductivity result of the measured liquid, can overcome the defects in the prior art, and can improve the conductivity measurement precision.
The conductivity measuring device will be described in detail with reference to the accompanying drawings and specific embodiments. Referring to fig. 1, fig. 1 is a schematic diagram of a conductivity measuring apparatus according to an embodiment of the present invention, and as can be seen, the conductivity measuring apparatus includes a cell body 10, a first electrode 11, a second electrode 12, a third electrode 13, a fourth electrode 14, a voltage portion 15, a current output circuit 16, a voltage output circuit 17, and a data processing portion 18.
The tank body 10 is used for placing the liquid to be measured, and can adopt various structures, and the invention is within the protection scope.
The first electrode 11, the second electrode 12, the third electrode 13 and the fourth electrode 14 are respectively contacted with the measured liquid in the cell body. The voltage part 15 is connected with the first electrode 11 and the second electrode 12, and the voltage part 15 applies voltage to the liquid to be measured in the cell body through the first electrode 11 and the second electrode 12.
In one embodiment, the voltage part 15 is specifically configured to apply a positive voltage to the measured liquid in the cell body through the first electrode 11 and the second electrode 12 for a preset time period, and then apply a negative voltage to the measured liquid in the cell body through the first electrode 11 and the second electrode 12 for the preset time period. The positive voltage is applied to the liquid to be measured in the cell body through the voltage part for a preset time period, and then the negative voltage is applied to the liquid to be measured in the cell body for a preset time period, so that the situation that the electric charge in the liquid is accumulated near a certain electrode to influence the measurement accuracy is avoided, the duration of applying the positive voltage is the same as that of applying the negative voltage, and the charge distribution balance at the two ends of the electrode can be ensured.
Preferably, the voltage of the positive voltage output by the voltage part 15 is adjustable, and the voltage of the negative voltage output by the voltage part 15 is adjustable, so that the conductivity measuring device can have a large measuring range and can meet the measuring requirement in a large interval range. The voltage part 15 can be preferably selected from a high-precision adjustable power supply, and can adjust the output voltage with high precision.
Optionally, in a specific implementation, the voltage part 15 includes a first voltage part for outputting a positive voltage, a second voltage part for outputting a negative voltage, and a selection switch for selectively turning on the first voltage part or turning on the second voltage part, and when the voltage is controlled to be applied to the cell body, the selection switch can control to turn on the first voltage part or the second voltage part.
The current output circuit 16 is connected to the first electrode 11 and the second electrode 12, and the current output circuit 16 collects the current of the measured liquid in the cell body through the first electrode 11 and the second electrode 12 and transmits the obtained current signal to the data processing unit 18. In an implementation manner, referring to fig. 2, fig. 2 is a schematic diagram of a current output circuit in the embodiment, where the current output circuit 16 includes a current-voltage conversion circuit 160, a first amplification circuit 161, and an analog-to-digital converter 162, which are connected in sequence; the current-voltage conversion circuit 160 is configured to convert the acquired current signal into a voltage signal; the first amplifying circuit 161 is configured to amplify the obtained voltage signal; the analog-to-digital converter 161 is configured to perform analog-to-digital conversion on the voltage signal and transmit the converted signal to the data processing unit 18.
Preferably, the first amplifying circuit 161 is an amplifying circuit with adjustable gain factor, and in practical application, the gain factor of the first amplifying circuit can be adjusted according to the actual condition of the liquid to be measured and the measurement precision requirement, so as to obtain higher measurement accuracy and measurement precision. The gain factor of the first amplifying circuit is adjustable, which expands the measuring dynamic range of the device, so that signals from large to small can be measured.
Further preferably, the current output circuit 16 further includes: a first filter 163 for filtering noise from the voltage signal output from the current-to-voltage conversion circuit 160 and transmitting the processed voltage signal to the first amplification circuit 161; the first filter circuit 164 is configured to filter the voltage signal output by the first amplifying circuit 161 and transmit the processed voltage signal to the analog-to-digital converter 162. A filter and a filter circuit are arranged in the current output circuit, so that noise of the signal is filtered before the signal is amplified, the signal quality is ensured, and the measured data is more accurate. Optionally, the first filter may be a butterworth low-pass filter, and the first filter circuit is a low-pass filter circuit.
The voltage output circuit 17 is connected to the third electrode 13 and the fourth electrode 14, and is configured to collect the voltage of the liquid to be measured in the cell through the third electrode 13 and the fourth electrode 14 and transmit the obtained voltage signal to the data processing unit 18. In one embodiment, referring to fig. 3, fig. 3 is a schematic diagram of a voltage output circuit in the present embodiment. The voltage output circuit 17 comprises a differential input circuit 170, a second amplifying circuit 171 and an analog-to-digital converter 162 which are connected in sequence; the differential input circuit 170 is configured to perform differential processing on the acquired voltage signals; the second amplifying circuit 171 is configured to amplify the obtained voltage signal; the analog-to-digital converter 162 is configured to perform analog-to-digital conversion on the voltage signal and transmit the converted signal to the data processing unit 18.
Preferably, the second amplifying circuit 171 is an amplifying circuit with an adjustable gain factor, and in practical application, the gain factor of the second amplifying circuit can be adjusted according to the actual condition of the liquid to be measured and the measurement precision requirement, so as to obtain higher measurement accuracy and measurement precision. The gain factor of the second amplifying circuit is adjustable, which expands the measuring dynamic range of the device, so that signals from large to small can be measured.
Further preferably, the voltage output circuit 17 further includes: a second filter 172, configured to filter noise from the voltage signal output by the differential input circuit 170 and transmit the processed voltage signal to the second amplifying circuit 171; the second filter circuit 173 is configured to filter the voltage signal output by the second amplifying circuit 171 and transmit the processed voltage signal to the analog-to-digital converter 162. A filter and a filter circuit are arranged in the voltage output circuit, so that noise of the signal is filtered before the signal is amplified, the signal quality is ensured, and the measured data is more accurate. Optionally, the second filter may be a butterworth low-pass filter, and the second filter circuit is a low-pass filter circuit.
Optionally, referring to fig. 2, the current output circuit 16 may further include a switch 165, and the switch 165 is configured to control the current output circuit to be turned on or off. Referring to fig. 3, the voltage output circuit 17 may further include a switch 174, and the switch 174 is used to control the voltage output circuit to be turned on or off.
In a preferred embodiment, the voltage part 15 is specifically configured to apply a positive voltage to the measured liquid in the cell body through the first electrode 11 and the second electrode 12 for a preset time period, and then apply a negative voltage to the measured liquid in the cell body through the first electrode 11 and the second electrode 12 for the preset time period. The data processing unit 18 is specifically configured to average a voltage signal acquired when a positive voltage is applied to the liquid to be measured and a voltage signal acquired when a negative voltage is applied to the liquid to be measured, average a current signal acquired when a positive voltage is applied to the liquid to be measured and a current signal acquired when a negative voltage is applied to the liquid to be measured, and calculate the result of measuring the conductivity of the liquid to be measured based on the voltage value and the current value obtained by averaging. In the process of measuring the measured liquid, due to the fact that the measured liquid factors or the applied excitation voltage fluctuate, the collected voltage signal or current signal can change and cannot be stabilized to a fixed value, therefore, the conductivity measuring device of the embodiment calculates by averaging the collected signals in a certain time period, and the measuring accuracy and the measuring precision can be improved.
Further preferably, the conductivity measuring device of the present embodiment further includes a discharge circuit 19 for discharging the electric charges from the electrodes. After the measurement is finished for one time, the electric charges of the electrodes are released through the discharging circuit, in addition, the electric charge imbalance caused by applying exciting voltage to the cell body in the measurement process can be solved through the electric charge releasing effect of the discharging circuit 19, the discharging circuit can ensure the conductivity measurement precision on one hand, and can release useless electric charges in the cell body on the other hand, so that the conductivity cell can be protected.
Preferably, the data processing unit 18 is further configured to adjust a gain multiple of the current output circuit 16 or the voltage output circuit 17 according to the currently obtained conductivity measurement result and the strength of the acquired analog signal, and adjust the gain multiple of the current output circuit 16 or the voltage output circuit 17 according to the currently measured conductivity measurement result and the currently measured strength of the acquired analog signal, so that a measurement result meeting the requirement can be obtained by performing the next measurement on the measured liquid. In particular, the gain of the first amplifying circuit may be adjusted, or the gain of the second amplifying circuit may be adjusted.
Specifically, in one embodiment, the work flow of the conductivity measuring device for performing one measurement is as follows:
s30: and the voltage part applies forward voltage to the liquid to be measured in the cell body, and measures current and voltage in real time for a preset time period.
S31: and the voltage part applies negative voltage to the liquid to be measured in the cell body and continues for a preset time period to measure the current and the voltage in real time.
S32: and calculating the conductivity measurement result of the measured liquid according to the obtained voltage signal and current signal.
S33: discharging the electric charge from the electrode in the cell body.
S34: and adjusting the gain multiple of the current output circuit or the voltage output circuit according to the current obtained conductivity measurement result and the acquired strength of the analog signal.
The above description provides a conductivity measuring device according to the present invention. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The conductivity measuring device is characterized by comprising a cell body, a first electrode, a second electrode, a third electrode, a fourth electrode, a voltage part, a current output circuit, a voltage output circuit and a data processing part;
the cell body is used for placing a liquid to be measured, the voltage part is connected with the first electrode and the second electrode and is used for applying voltage to the liquid to be measured in the cell body through the first electrode and the second electrode, and the current output circuit is connected with the first electrode and the second electrode and is used for collecting the current of the liquid to be measured in the cell body through the first electrode and the second electrode and transmitting the obtained current signal to the data processing part;
the voltage output circuit is connected with the third electrode and the fourth electrode and is used for collecting the voltage of the liquid to be detected in the cell body through the third electrode and the fourth electrode and transmitting the obtained voltage signal to the data processing part;
and the data processing part is used for calculating the conductivity measurement result of the measured liquid according to the obtained voltage signal and current signal.
2. The conductivity measuring apparatus according to claim 1, wherein the voltage part is specifically configured to apply a positive voltage to the measured liquid in the cell body through the first electrode and the second electrode for a preset time period, and then apply a negative voltage to the measured liquid in the cell body through the first electrode and the second electrode for the preset time period.
3. The conductivity measuring apparatus according to claim 2, wherein the data processing section is configured to average a voltage signal acquired when a positive voltage is applied to the liquid to be measured and a voltage signal acquired when a negative voltage is applied to the liquid to be measured, average a current signal acquired when a positive voltage is applied to the liquid to be measured and a current signal acquired when a negative voltage is applied to the liquid to be measured, and calculate the conductivity measurement result of the liquid to be measured based on the voltage value and the current value obtained by averaging.
4. The conductivity measuring apparatus according to claim 2, wherein the voltage section outputs a positive voltage with an adjustable voltage magnitude, and the voltage section outputs a negative voltage with an adjustable voltage magnitude.
5. The conductivity measuring apparatus according to claim 1, wherein the current output circuit includes a current-voltage converting circuit, a first amplifying circuit, and an analog-to-digital converter, which are connected in this order;
the current-voltage conversion circuit is used for converting the acquired current signals into voltage signals;
the first amplifying circuit is used for amplifying the obtained voltage signal;
the analog-to-digital converter is used for performing analog-to-digital conversion on the voltage signal and transmitting the converted signal to the data processing part.
6. The conductivity measurement device according to claim 5, wherein the current output circuit further comprises:
the first filter is used for filtering noise of the voltage signal output by the current-voltage conversion circuit and transmitting the processed voltage signal to the first amplifying circuit;
and the first filter circuit is used for filtering the voltage signal output by the first amplifying circuit and transmitting the processed voltage signal to the analog-to-digital converter.
7. The conductivity measuring apparatus according to claim 1, wherein the voltage output circuit includes a differential input circuit, a second amplifying circuit, and an analog-to-digital converter, which are connected in this order;
the differential input circuit is used for carrying out differential processing on the acquired voltage signals;
the second amplifying circuit is used for amplifying the obtained voltage signal;
the analog-to-digital converter is used for performing analog-to-digital conversion on the voltage signal and transmitting the converted signal to the data processing part.
8. The conductivity measurement device according to claim 7, wherein the voltage output circuit further comprises:
the second filter is used for filtering noise of the voltage signal output by the differential input circuit and transmitting the processed voltage signal to the second amplifying circuit;
and the second filter circuit is used for filtering the voltage signal output by the second amplifying circuit and transmitting the processed voltage signal to the analog-to-digital converter.
9. The conductivity measuring apparatus according to any one of claims 1 to 8, further comprising a discharge circuit for discharging an electric charge from the electrode.
10. The conductivity measuring apparatus according to any one of claims 1 to 8, wherein the data processing section is further configured to adjust a gain multiple of the current output circuit or the voltage output circuit according to a currently obtained conductivity measurement result and a strength of the acquired analog signal.
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| CN201910958642.5A CN110646678A (en) | 2019-10-10 | 2019-10-10 | Conductivity measuring device |
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| CN201910958642.5A CN110646678A (en) | 2019-10-10 | 2019-10-10 | Conductivity measuring device |
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| CN111830025A (en) * | 2020-07-21 | 2020-10-27 | 宿迁学院 | Online measuring device for electrolytic machining |
| CN112798866A (en) * | 2020-12-31 | 2021-05-14 | 中天海洋***有限公司 | Conductivity signal acquisition circuit and testing device |
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| CN112798866B (en) * | 2020-12-31 | 2023-05-02 | 江苏中天科技股份有限公司 | Conductivity signal acquisition circuit and testing device |
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