CN110806440B - Coulomb method micro-water meter - Google Patents
Coulomb method micro-water meter Download PDFInfo
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- CN110806440B CN110806440B CN201911190123.5A CN201911190123A CN110806440B CN 110806440 B CN110806440 B CN 110806440B CN 201911190123 A CN201911190123 A CN 201911190123A CN 110806440 B CN110806440 B CN 110806440B
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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
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/42—Measuring deposition or liberation of materials from an electrolyte; Coulometry, i.e. measuring coulomb-equivalent of material in an electrolyte
- G01N27/423—Coulometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/02—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor using a plurality of sample containers moved by a conveyor system past one or more treatment or analysis stations
- G01N35/025—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor using a plurality of sample containers moved by a conveyor system past one or more treatment or analysis stations having a carousel or turntable for reaction cells or cuvettes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/02—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor using a plurality of sample containers moved by a conveyor system past one or more treatment or analysis stations
- G01N35/04—Details of the conveyor system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/10—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices
- G01N35/1004—Cleaning sample transfer devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/10—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices
- G01N35/1009—Characterised by arrangements for controlling the aspiration or dispense of liquids
- G01N35/1016—Control of the volume dispensed or introduced
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/02—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor using a plurality of sample containers moved by a conveyor system past one or more treatment or analysis stations
- G01N35/04—Details of the conveyor system
- G01N2035/0439—Rotary sample carriers, i.e. carousels
- G01N2035/0446—Combinations of the above
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Abstract
The application discloses a coulometric method micro-water meter, which comprises a sample feeding device, a detection device and a data processing device, wherein the sample feeding device comprises a sample disc and a sampling assembly, the sample disc is provided with a carrier liquid bottle and at least one sample bottle, the carrier liquid bottle is filled with dry insulating oil, and the sample bottle is filled with an oil sample to be detected; the sampling assembly comprises a sampling tube, a sampling head communicated with the sampling tube, a quinary pump, a sampling tube, a waste liquid tube and a waste liquid bottle, and the sampling device can realize automatic sampling of an oil sample to be detected, so that the accuracy, the detection speed and the automation degree of detecting the moisture content are improved. The coulomb method micro-water meter has the advantages of simple structure, easy operation and strong operability, and can be widely popularized and used.
Description
Technical Field
The application relates to the technical field of improvement of insulating oil micro-water meters, in particular to a coulomb method micro-water meter.
Background
The electrical insulating oil is a lubricating oil prepared by adding an antioxidant into deeply refined lubricating oil base oil, and is used in electrical equipment such as transformers, oil immersed switches, transformers, capacitors, cables and the like. An important quality monitoring index of the electrical insulating oil is moisture content, which can cause the breakdown voltage of the electrical insulating oil to be reduced, the dielectric loss factor to be increased and the aging of the insulating oil to be accelerated, so that if trace moisture exists in the electrical insulating oil in operation, the electrical property and the physical and chemical properties of the insulating medium can be greatly damaged, the paper insulation can be permanently damaged in severe cases, the operation reliability and the service life of oil-filled electrical equipment are reduced, and even insulation accidents are caused.
In order to prevent the above problems, it is necessary to periodically measure the moisture content of the operating electrical insulating oil during practical use. At present, the method for measuring the moisture content in the electrical insulating oil is a coulometric titration method, an electrolytic current automatic control system is adopted in the method, the high sensitivity and the high speed of the analysis process are ensured, however, manual sampling (the sampling amount is 1mL) is required to be added into a detector for detection in the measurement process, and in the manual sampling process, the sampling error caused by human factors is large, so that the accuracy of the detected moisture content is influenced.
Disclosure of Invention
The application provides a coulomb method micro-water meter, which aims to solve the problem that the existing coulomb method micro-water meter has low detection accuracy.
The application provides a coulometric method micro-water meter, which comprises a sample feeding device, a detection device and a data processing device, wherein the sample feeding device comprises a sample disc and a sampling assembly, the sample disc is provided with a carrier liquid bottle and at least one sample bottle, the carrier liquid bottle is filled with dry insulating oil, and the sample bottle is filled with an oil sample to be detected; the sampling assembly comprises a sampling tube, a sampling head communicated with the sampling tube, a quinary pump, a sampling tube, a waste liquid tube and a waste liquid bottle;
the detection device comprises an electrolytic assembly, the electrolytic assembly comprises a sealed oil cup, a positive electrode and a negative electrode, a liquid inlet is formed in the sealed oil cup and is communicated with a liquid inlet pipe of the sampling assembly, a test solution is contained in the sealed oil cup, and the test solution is used for carrying out oxidation-reduction reaction with water molecules in an oil sample to be detected in the electrolytic process; the positive electrode and the negative electrode are connected to a data processing device and used for sending voltage data in the electrolysis process to the data processing device;
the data processing device comprises a controller, a data processor and a display, wherein the controller is used for controlling the data processing module to calculate the micro water content of the oil sample to be measured according to the voltage data and controlling the display to display the calculated micro water content.
Optionally, the quinary pump comprises a rotating disc and a motor, the rotating disc is provided with a sample measuring cavity, a washing liquid cavity and a No. 1-5 communicating pipe, wherein the No. 1-3 communicating pipe is communicated with the sample measuring cavity, the No. 4 and No. 5 communicating pipes are communicated with the washing liquid cavity,
the included angle between the No. 1 and No. 2 communicating pipes is matched with the included angle between the sampling pipe and the waste liquid pipe;
the included angle between the No. 2 and the No. 3 communicating pipes is matched with the included angle between the sampling pipe and the sampling pipe;
the included angle between No. 4, No. 5 communicating pipes with the included angle phase-match between sampling tube, the waste liquid pipe.
Optionally, the sampling assembly comprises a sample holder for mounting the quinary pump.
Optionally, the sample disc is a rotating disc.
Optionally, an air pressure balancing port is formed in the sealing oil cup.
Optionally, the detection device further comprises a magnetic stirrer, and correspondingly, a magnetic rotor is arranged in the sealing oil cup.
Optionally, the positive electrode and the negative electrode are connected to a controller of the data processing device through a data connecting line and a data binding post.
Optionally, the data processing apparatus further comprises a setting keyboard.
Optionally, the coulomb method micro-water meter further comprises a printer connected to the data processing device, and the printer is used for printing the micro-water content of the oil sample to be measured.
The application provides a little water appearance of coulomb method, including sampling device, detection device and data processing apparatus, wherein, sampling device can realize the autoinjection to the oil sample that awaits measuring, has improved the degree of accuracy, detection speed and the degree of automation that detect moisture content. In addition, the coulomb method micro-water meter has the advantages of simple and feasible structure, strong operability and wide popularization and application.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a coulometric microaqueometer according to the present application;
fig. 2 is a schematic structural diagram of the quinary pump of the present application.
The reference numerals in fig. 1-2 denote: 1-sample introduction device, 11-sample tray, 111-liquid carrier bottle, 112-sample bottle, 12-sampling tube, 121-sampling head, 13-quinary pump, 131-sample measuring cavity, 132-liquid washing cavity, 14-sample introduction tube, 15-waste liquid tube, 16-waste liquid bottle, 17-sample introduction support, 18-base, 2-detection device, 21-sealing oil cup, 211-liquid inlet, 212-air pressure balancing port, 22-positive electrode, negative electrode, 23-data wiring terminal, 24-magnetic stirrer, 25-magnetic rotor, 3-data processing device, 31-display, 32-setting keyboard and 33-printer.
Detailed Description
The application provides a little water appearance of coulomb method is arranged in going on the moisture content in the electrical insulation oil, through the autoinjection to the oil sample that awaits measuring, avoids the great problem of error that the artificial sample caused, has improved the degree of accuracy, detection speed and the degree of automation that detect moisture content.
Fig. 1 is a schematic structural diagram of a coulomb method micro-water meter according to the present application, and as shown in fig. 1, the coulomb method micro-water meter includes a sample introduction device 1, a detection device 2 and a data processing device 3, wherein the sample introduction device 1 includes a sample tray 11 and a sampling assembly, a carrier liquid bottle 111 and at least one sample bottle 112 are arranged on the sample tray 11, the carrier liquid bottle 111 contains dry insulating oil, and the sample bottle 112 contains an oil sample to be measured; the sampling assembly comprises a sampling tube 12, a sampling head 121 communicated with the sampling tube 12, a quinary pump 13, a sampling tube 14, a waste liquid tube 15 and a waste liquid bottle 16 communicated with the waste liquid tube 15. In the present application, the opening of the liquid carrier bottle 111 or a sample bottle 112 is sealed by soft glue, and the sampling head 121 can be easily inserted and pulled out. In addition, the quantity of sample bottle is a plurality of, can prevent a plurality of oil samples that await measuring to realize the continuous detection to a plurality of oil samples that await measuring, thereby improve detection efficiency.
In this application, sample tray 11 is the rotary disk, is equipped with a liquid-carrying bottle 111 and several sample bottle 112 on sample tray 11, and the oil appearance that awaits measuring is splendid attire in every sample bottle 112, during the actual use, through rotating sample tray 11, can make sampling head 121 correspond liquid-carrying bottle 111 or certain sample bottle 112 to accomplish the extraction process to dry insulating oil or the oil appearance that awaits measuring. Of course, the sampling head 121 may be movable, and the sampling of the dry insulating oil or the oil sample to be tested may be accomplished by the relative displacement between the sampling head 121 and the rotating disk.
In this application, quinary pump 13 is used for carrying out the ration sample to the oil appearance that awaits measuring, and fig. 2 is the structural schematic diagram of the quinary pump of this application, as shown in fig. 2, quinary pump 13 includes rolling disc and motor, is equipped with sample measuring chamber 131, lotion chamber 132 and No. 1-5 communicating pipe on the rolling disc, and wherein, No. 1-3 communicating pipe communicates with sample measuring chamber 131, and No. 4, 5 communicating pipe communicate with lotion chamber 132. Relative position between 1-5 communicating pipes can be adjusted according to the position between sampling pipe 12, sampling pipe 14 and waste liquid pipe 15, in this application, the contained angle between 1, 2 communicating pipes matches with the contained angle between sampling pipe 12, waste liquid pipe 15, the contained angle between 2, 3 communicating pipes matches with the contained angle between sampling pipe 14, sampling pipe 12, the contained angle between 4, 5 communicating pipes matches with the contained angle between sampling pipe 12, waste liquid pipe 15.
In order to fix the positions of the quinary pump 13, the sampling tube 12, the sampling tube 14 and the waste liquid tube 15 conveniently, in the application, the sampling assembly further comprises a sampling support 17, the sampling support 17 is used for erecting the quinary pump 13, and correspondingly, the sampling tube 12, the sampling tube 14 and the waste liquid tube 15 are arranged at corresponding positions according to the position of the quinary pump 13. In order to fix the sample feeding support 17, the sample feeding device 1 of the present application further includes a base 18, the base 18 is provided with the sample tray 11 and the sample feeding support 17, the sample feeding support 17 can be fixed on the base 18, and can also be movably connected to the base 18, and the sample feeding support 17 can move relatively to the sample tray 11 on the base 18, so as to facilitate sampling.
The process of cleaning the pipeline by adopting the quinary pump 13 specifically comprises the following steps: rotating the sample disc 11, controlling the sampling tube 12, making the sampling head 121 correspond to the liquid carrying bottle 111, then rotating the rotating disc, making the No. 3 communicating tube align with the sampling tube 12, the No. 2 communicating tube align with the sample feeding tube 14, starting the motor, extracting the dry insulating oil from the liquid carrying bottle 111, the dry insulating oil enters the sample measuring cavity 131 from the No. 3 communicating tube, then enters the sample feeding tube 14 through the No. 2 communicating tube, enters the sealed oil cup 21 through the sample feeding tube 14, until the charge quantity of the two electrodes in the sealed oil cup 21 is not changed, the sampling tube and the sample feeding tube can be cleaned.
The process of acquiring the quantitative oil sample to be measured by adopting the quinary pump 13 specifically comprises the following steps:
step 4, squeezing the oil sample to be detected in the sample detection cavity 131 to the detection device 2 by using dry insulating oil, wherein the method specifically comprises the steps of rotating the sample disc 11 to enable the sampling head 121 to correspond to the liquid carrier bottle 111; then, the rotating disc is rotated to make the No. 4 communicating pipe align with the sampling pipe 12 and the No. 5 communicating pipe align with the waste liquid pipe 15, the motor is started, the dry insulating oil is extracted from the liquid carrying bottle 111, the oil sample to be detected in the sampling pipe 12 is removed, and the sampling pipe 12 is filled with the dry insulating oil; then, the rotating disc is rotated to align the No. 3 communicating pipe with the sampling pipe 12 and the No. 2 communicating pipe with the sampling pipe 14, the motor is started to extract the dry insulating oil from the liquid carrying bottle 111, the dry insulating oil is used for squeezing the oil sample to be detected in the sample detection cavity 131 to the detection device 2, and quantitative acquisition of the oil sample to be detected is completed. It should be noted that in the process, a small amount of oil samples to be measured also exist in the No. 2 communicating pipe, and if the pipe diameter of the No. 2 communicating pipe is small, the oil samples to be measured in the No. 2 communicating pipe can be ignored; if the pipe diameter of the No. 2 communicating pipe is large, the oil sample to be measured in the No. 2 communicating pipe cannot be ignored, and the capacity of the No. 2 communicating pipe should be considered when designing the capacity of the sample measuring cavity 131, so that the sampling error is reduced. It should be noted that, in the above process, the sampling action of the sampling head 121 and the rotation action of the sample tray 11 and the rotation tray can be implemented by using corresponding motors, which belong to the prior art and will not be described in detail herein.
In the application, the detection device 2 comprises an electrolysis assembly, the electrolysis assembly comprises a sealed oil cup 21 and a positive electrode 22 and a negative electrode 22, a liquid inlet 211 is arranged on the sealed oil cup 21, the liquid inlet 211 is communicated with a liquid inlet pipe of the sampling assembly, a test solution is contained in the sealed oil cup 21, and the test solution is used for carrying out oxidation-reduction reaction with water molecules in an oil sample to be detected in the electrolysis process; the positive and negative electrodes 22 are connected to the data processing device 3 for transmitting voltage data during the electrolysis process to the data processing device 3. In the present application, the positive and negative electrodes 22 are connected to the controller of the data processing device 3 through data connection lines and data terminals 23.
For preventing that the moisture of outside air from getting into in the sealed oil cup 21 causes the influence to experimental data, sealed oil cup 21 in this application has better sealing performance, is equipped with atmospheric pressure balance mouth 212 on sealed oil cup 21 to in the oil sample accessible feed liquor pipe that awaits measuring gets into sealed oil cup 21 smoothly. The air pressure balancing port 212 is communicated with the air and the inside of the sealed bottle to balance the air pressure inside and outside the sealed oil cup 21, and a drying agent is arranged in the air pressure balancing port 212 and used for preventing moisture in the air from entering the sealed oil cup 21.
In order to make the electrolytic reaction in the sealed oil cup 21 more sufficient, the detecting device 2 further comprises a magnetic stirrer 24, and correspondingly, a magnetic rotor 25 is arranged in the sealed oil cup 21. During the electrolytic reaction, the magnetic rotor 25 can stir the detection liquid, thereby ensuring the full and rapid electrolytic reaction.
The data processing device 3 comprises a controller, a data processor and a display 31, wherein the controller is used for controlling the data processing module to calculate the micro water content of the oil sample to be measured according to the voltage data, and controlling the display 31 to display the calculated micro water content. Of course, the controller is also used for controlling the action of the quinary pump 13, including controlling the rotation of the rotating disc and the start and stop of the motor, and the control process can be realized by adopting the prior art, and will not be described in detail herein. In addition, the controller is also used to control the rotation of the sample tray 11 and the action of the sampling head 121, and the control process can be implemented by using the prior art, and will not be described in detail herein.
In the application, the coulometric method micro-water meter further comprises a printer 33 connected with the data processing device 3, and the printer 33 is used for printing the micro-water content of the oil sample to be measured.
In this application, the data processing apparatus 3 further includes a keyboard 32, and the keyboard is used for controlling the start and stop of the sample injection device 1 and the detection device 2 and the action of the printer 33. In order to facilitate cleaning of the sample measuring cavity 131 and the pipeline in the instrument, in the application, the keyboard comprises a cleaning key, and one-key operation in the cleaning process can be realized through the cleaning key.
In the present application, the principle of calibrating the micro water content specifically includes: the test solution is iodine, pyridine and methanol, when water exists in the sealed oil cup 21, the iodine is reduced by sulfur dioxide, and pyridine hydroiodide and pyridine methyl bisulfate are generated under the action of the pyridine and the methanol, and the reaction formula is as follows:
H2O+I2+SO2+3C5H5N——→2C5H5N·HI+C5H5N·SO3
C5H5N·SO3+CH3OH——→C5H5N·HSO4CH3，
during electrolysis, the electrode reactions are as follows:
anode: 2I of--2e——→I2，
Cathode: 2H++2e——→2I-，I2+2e——→2I-，
The iodine generated in the electrolysis process reacts with water molecules in the oil sample to be detected to generate hydroiodic acid until all water in the oil sample to be detected is reacted, and the reaction end point is indicated by a detection unit consisting of a pair of platinum electrodes. In the whole process, sulfur dioxide is consumed, and the consumption is equal to the mole number of water.
According to Faraday's law of electrolysis, the amount of electricity used for electrolysis is proportional to the amount of iodine, i.e. 1mol of iodine is electrolyzed, 1mol of water is consumed, and twice 96493C electricity is needed, and the calculation formula is as follows:
namely, it is
In formula (1): m/mug is the water content in the oil sample to be measured, Q/mC is the electrolytic capacity, and 18 is the relative mass of water.
According to the sample introduction volume of the oil sample to be measured, calculating the moisture content according to the formula (2):
in formula (2): rho/mg. L-1The water content of the oil sample to be detected is shown, m/mg is the water content of the sample to be detected, and V/mL is the sample introduction volume of the oil sample to be detected.
The coulomb method micro-water meter of the application has the following use process: adding test liquid into the sealed oil cup, adding an oil sample to be tested into a sample bottle on the sample tray, and adding dry insulating oil into a carrier liquid bottle; by passingSetting a keyboard, and setting related parameters including sampling amount, a sample inlet and the like; clicking a cleaning button on a keyboard, absorbing dry insulating oil in a carrier liquid bottle, introducing the dry insulating oil into a sealed oil cup, filling a dry oil sample in a pipeline until the charge quantity of the two electrodes is unchanged; clicking a sample testing key on a keyboard, and sequentially detecting the oil sample to be detected; after the detection is finished, the detection result is displayed on a display, and the detection result comprises the electrolytic capacity Q and the water content
And printing a detection result.
The application provides a little water appearance of coulomb method, including sampling device, detection device and data processing apparatus, wherein, sampling device can realize the autoinjection to the oil sample that awaits measuring, has improved the degree of accuracy, detection speed and the degree of automation that detect moisture content. In addition, the coulomb method micro-water meter has the advantages of simple and feasible structure, strong operability and wide popularization and application.
The above-described embodiments of the present application do not limit the scope of the present application.
Claims (8)
1. The coulometric method micro-water meter is characterized by comprising a sample feeding device (1), a detection device (2) and a data processing device (3), wherein the sample feeding device (1) comprises a sample disc (11) and a sampling assembly, a liquid carrying bottle (111) and at least one sample bottle (112) are arranged on the sample disc (11), dry insulating oil is contained in the liquid carrying bottle (111), and an oil sample to be detected is contained in the sample bottle (112); the sampling assembly comprises a sampling tube (12), a sampling head (121) communicated with the sampling tube (12), a quinary pump (13), a sample inlet tube (14), a waste liquid tube (15) and a waste liquid bottle (16);
the quinary pump (13) comprises a rotating disc and a motor, a sample measuring cavity (131), a washing liquid cavity (132) and a No. 1-5 communicating pipe are arranged on the rotating disc, wherein the No. 1-3 communicating pipe is communicated with the sample measuring cavity (131), the No. 4 and No. 5 communicating pipes are communicated with the washing liquid cavity (132),
the included angle between the No. 1 communicating pipe and the No. 2 communicating pipe is matched with the included angle between the sampling pipe (12) and the waste liquid pipe (15);
the included angle between the No. 2 and No. 3 communicating pipes is matched with the included angle between the sampling pipe (14) and the sampling pipe (12);
the included angle between the No. 4 and No. 5 communicating pipes is matched with the included angle between the sampling pipe (12) and the waste liquid pipe (15);
when the sample measuring cavity (131) is cleaned and an oil sample to be measured is extracted, the No. 1 communicating pipe is aligned with the sampling pipe (12), and the No. 2 communicating pipe is aligned with the waste liquid pipe (15), so that the No. 1 communicating pipe, the sample measuring cavity (131) and the No. 2 communicating pipe are communicated;
when the oil sample to be measured in the sampling pipe (12) is removed, the No. 4 communicating pipe is aligned with the sampling pipe (12), and the No. 5 communicating pipe is aligned with the waste liquid pipe (15);
when quantitatively extruding the oil sample to be detected in the sample detection cavity (131) to the detection device (2), aligning the No. 3 communicating pipe with the sampling pipe (12) and aligning the No. 2 communicating pipe with the sample inlet pipe (14);
the detection device (2) comprises an electrolytic assembly, the electrolytic assembly comprises a sealed oil cup (21) and a positive electrode (22) and a negative electrode (22), a liquid inlet (211) is formed in the sealed oil cup (21), the liquid inlet (211) is communicated with a liquid inlet pipe of the sampling assembly, a test liquid is contained in the sealed oil cup (21), and the test liquid is used for carrying out redox reaction with water molecules in an oil sample to be detected in the electrolytic process; the positive electrode (22) and the negative electrode (22) are connected to a data processing device (3) and are used for sending voltage data in the electrolytic process to the data processing device (3);
the data processing device (3) comprises a controller, a data processor and a display (31), wherein the controller is used for controlling the data processing module to calculate the micro water content of the oil sample to be measured according to the voltage data, and controlling the display (31) to display the calculated micro water content.
2. The coulometric microammeter according to claim 1, characterized in that the sampling assembly comprises a sample holder (17), the sample holder (17) being used to mount the quinary pump (13).
3. The coulometric microammeter according to claim 1, characterized in that the sample disk (11) is a rotating disk.
4. The coulometric microaqueometer according to claim 1, characterized in that the sealing oil cup (21) is provided with a gas pressure balancing port (212).
5. The coulometric microammeter according to claim 1, characterized in that said detection device (2) further comprises a magnetic stirrer (24), and correspondingly, a magnetic rotor (25) is provided in said sealed oil cup (21).
6. The coulometric microassay device according to claim 1, characterized in that said positive and negative electrodes (22) are connected to the controller of said data processing device (3) by means of data connection lines and data terminals (23).
7. The coulometric micro-water meter according to claim 1, characterized in that the data processing device (3) further comprises a setup keyboard (32).
8. The coulometric micro-water meter according to claim 1, characterized in that it further comprises a printer (33) connected to the data processing device (3), the printer (33) being used to print the micro-water content of the oil sample to be measured.
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