CN117405754A - Method for prolonging service life of electrochemical trace oxygen sensor - Google Patents
Method for prolonging service life of electrochemical trace oxygen sensor Download PDFInfo
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- CN117405754A CN117405754A CN202311463145.0A CN202311463145A CN117405754A CN 117405754 A CN117405754 A CN 117405754A CN 202311463145 A CN202311463145 A CN 202311463145A CN 117405754 A CN117405754 A CN 117405754A
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- 239000001301 oxygen Substances 0.000 title claims abstract description 148
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 148
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000004020 conductor Substances 0.000 claims abstract description 8
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical class O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 91
- 229910052757 nitrogen Inorganic materials 0.000 claims description 45
- 238000007789 sealing Methods 0.000 claims description 29
- 229910052802 copper Inorganic materials 0.000 claims description 15
- 239000010949 copper Substances 0.000 claims description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000010926 purge Methods 0.000 claims description 6
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 230000008961 swelling Effects 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005538 encapsulation Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
- G01N27/409—Oxygen concentration cells
-
- 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
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
- G01N27/4078—Means for sealing the sensor element in a housing
-
- 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
- G01N27/403—Cells and electrode assemblies
- G01N27/414—Ion-sensitive or chemical field-effect transistors, i.e. ISFETS or CHEMFETS
- G01N27/4141—Ion-sensitive or chemical field-effect transistors, i.e. ISFETS or CHEMFETS specially adapted for gases
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Molecular Biology (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a method for prolonging the service life of an electrochemical trace oxygen sensor, which comprises the following steps: the anode and the cathode of the electrochemical micro oxygen sensor are short-circuited by using a conductive material. An N-channel JFET tube is bridged between an anode and a cathode of the electrochemical micro oxygen sensor, the grid electrode of the JFET tube is connected with a negative power supply, and the drain electrode and the source electrode of the JFET tube are respectively connected with an anode OXY+ and a cathode OXY-of the electrochemical oxygen sensor and then connected to an operational amplifier. The invention can greatly reduce the contact between the electrochemical trace oxygen sensor and oxygen, thereby prolonging the service life of the sensor.
Description
Technical Field
The invention relates to the field of electrochemical trace oxygen sensors, in particular to a method for prolonging the service life of an electrochemical trace oxygen sensor.
Background
The current generated by the reaction of oxygen in the electrochemical trace oxygen sensor is proportional to the oxygen content in the sample gas, and the output signal of the sensor is related to the oxygen content in the sample gas. By connection of an external circuit, the charge transfer in the reaction, i.e. the magnitude of the current, is directly proportional to the oxygen taking part in the reaction, so that the oxygen content in the sample gas, which is typically several ppm or less, can be measured.
Once high concentration oxygen contacts the electrochemical micro oxygen sensor, the product PbO of the chemical reaction quickly reaches the limit specified by the dissolution solution, and the life of the sensor is greatly shortened. An electrochemical oxygen sensor that is constantly detecting ppm levels of oxygen, typically has a service life of 1-2 years; if this sensor is exposed to air for a long period of time, its lifetime may be only around 10 days.
In the use process of the electrochemical micro oxygen sensor, the electrochemical micro oxygen sensor is usually installed on an oxygen analyzer to detect, in order to prevent the electrochemical micro oxygen sensor from contacting air, the outlet and the inlet of the analyzer are generally plugged directly to block the air from entering the sensor, but in the process of plugging the outlet and the inlet of the analyzer, a large amount of air is already sealed in the gas path pipeline of the analyzer and the sensor cavity, and the problem of shortened service life of the electrochemical micro oxygen sensor still exists. Therefore, there is a need for a new method of extending the service life of an electrochemical micro oxygen sensor that consumes very little oxygen in the electrochemical micro oxygen sensor when the analyzer is not in operation, thereby extending the service life of the sensor.
Disclosure of Invention
In view of the above, the present invention aims to overcome the defects in the prior art, and provide a method for prolonging the service life of an electrochemical micro oxygen sensor, which can greatly reduce the contact between the electrochemical micro oxygen sensor and oxygen, thereby prolonging the service life of the sensor.
The method for prolonging the service life of the electrochemical micro oxygen sensor comprises the following steps: the anode and the cathode of the electrochemical micro oxygen sensor are short-circuited by using a conductive material.
Further, the conductive material is one of a copper sheet, an aluminum sheet, an iron sheet and a silver sheet.
Further, the method further comprises the following steps:
an N-channel JFET tube is bridged between an anode and a cathode of the electrochemical micro oxygen sensor, the grid electrode of the JFET tube is connected with a negative power supply, and the drain electrode and the source electrode of the JFET tube are respectively connected with an anode OXY+ and a cathode OXY-of the electrochemical oxygen sensor and then connected to an operational amplifier.
Further, during the period that the oxygen analyzer is not in operation, the electrochemical micro oxygen sensor is arranged in the flow cell, and the four-way ball valve is communicated with the flow cell through a stainless steel pipeline; the method comprises the following steps:
the handle of the four-way ball valve is positioned at 0 DEG, the port 1 and the port 2 of the four-way ball valve are communicated, and the port 3 and the port 4 are communicated, so that the four-way ball valve is in a sampling state; introducing nitrogen into the four-way ball valve, flowing the nitrogen into the flow cell, and filling nitrogen into the electrochemical micro oxygen sensor loop;
the nitrogen purge is for a time sufficient to give an oxygen analyzer indicator of a few ppm or less;
the handle of the four-way ball valve is positioned at 90 degrees, the port 1 and the port 4 of the four-way ball valve are communicated, and the port 2 and the port 3 are communicated, so that the four-way ball valve is in a bypass state; the electrochemical micro oxygen sensor in the flow cell was sealed in a nitrogen atmosphere.
Further, the encapsulation protection is carried out on the electrochemical trace oxygen sensor, and the method specifically comprises the following steps:
placing an electrochemical trace oxygen sensor into an anti-static double-layer self-sealing plastic bag;
inserting an air inlet guide pipe into the plastic bag close to the bottom, and introducing high-purity nitrogen;
after the nitrogen is used for swelling the anti-static double-layer self-sealing plastic bag, the self-carrying seal of the anti-static double-layer self-sealing plastic bag is used for sealing;
then the air inlet conduit is drawn out to the sealing part of the anti-static double-layer self-sealing plastic bag, and high-purity nitrogen is continuously introduced;
finally, the anti-static double-layer self-sealing plastic bag is thermally sealed by a hand-press type sealing machine, so that the electrochemical micro oxygen sensor is in a high-purity nitrogen environment.
Further, when the oxygen analyzer is put into operation, the operation is performed as follows:
the handle of the four-way ball valve is positioned at 0 DEG, the port 1 and the port 2 of the four-way ball valve are communicated, and the port 3 and the port 4 are communicated, so that the four-way ball valve is in a sampling state; introducing nitrogen into the four-way ball valve, allowing the nitrogen to flow into the flow cell, and filling the flow cell with nitrogen;
taking out the electrochemical micro oxygen sensor from the sealed anti-static double-layer self-sealing plastic bag, pulling out the short-circuit copper sheet, rapidly installing the sensor in a flow cell of the oxygen analyzer, and timely compacting a cover of the flow cell to seal the flow cell from air leakage;
continuously charging nitrogen so that the nitrogen is purged for a long enough time;
the oxygen analyzer is electrified, the oxygen measurement indication value change of the oxygen analyzer is observed, and when the oxygen indication value is close to zero, the oxygen analyzer is put into operation on the sample gas of the sampling process, and the oxygen content of the sample gas is measured.
Further, the method further comprises the following steps: the temperature response of the electrochemical oxygen sensor is parameterized for temperature compensation.
The beneficial effects of the invention are as follows: according to the method for prolonging the service life of the electrochemical trace oxygen sensor, disclosed by the invention, the anode and the cathode of the electrochemical trace oxygen sensor are short-circuited by the copper sheet, so that the very little trace oxygen in high-purity nitrogen sealed in the electrochemical trace oxygen sensor is consumed in the electrochemical trace oxygen sensor, and the service life of the sensor is prolonged; the four-way ball valve is arranged on the oxygen analyzer, the electrochemical microsensor is arranged in the analyzer, nitrogen is introduced into the analyzer, the electrochemical oxygen sensor is sealed in a nitrogen environment, and the service life of the sensor during the period that the oxygen analyzer is not in operation is further prolonged.
Drawings
The invention is further described below with reference to the accompanying drawings and examples:
FIG. 1 is a schematic view of an oxygen sensor with a copper sheet according to the present invention;
FIG. 2 is a schematic diagram of the structure of the oxygen sensor protection circuit of the present invention;
FIG. 3 is a schematic diagram of a four-way ball valve of the present invention in a sampling state;
FIG. 4 is a schematic view of the four-way ball valve of the present invention in a bypass state;
FIG. 5 is a schematic diagram of a potting protection structure of the present invention;
the device comprises an 11-electrochemical micro oxygen sensor, a 12-cathode, a 13-anode, a 14-copper sheet, a 22-N channel JFET tube, a 23-operational amplifier, a 31-antistatic double-layer self-sealing plastic bag, a 33-air inlet conduit, a 41-four-way ball valve, a 42-stainless steel pipeline and a 43-flow cell.
Detailed Description
The invention is further described with reference to the accompanying drawings, in which:
the method for prolonging the service life of the electrochemical micro oxygen sensor comprises the following steps: the anode 13 and cathode 12 of the electrochemical micro oxygen sensor 11 are shorted using a conductive material.
As shown in fig. 1, the anode 13 and the cathode 12 of the electrochemical micro oxygen sensor 11 are shorted by the copper sheet 14, the copper sheet 14 can be fixed by self-adhesive, and the very small amount of oxygen in the high-purity nitrogen sealed in the electrochemical micro oxygen sensor 11 is consumed in the electrochemical micro oxygen sensor 11, so that the contact time of the electrochemical micro oxygen sensor 11 and oxygen is reduced, and the service life of the sensor can be prolonged; meanwhile, when the subsequent sensor is installed on the oxygen analyzer, the purging time of the sensor is reduced when the analyzer is put into operation, so that the detection purpose of accurately measuring the trace oxygen content in the process sample gas is realized rapidly.
In this embodiment, the conductive material is one of a copper sheet, an aluminum sheet, an iron sheet, and a silver sheet. The metal materials have good conductivity, copper has good conductivity, copper sheets are easy to obtain, meanwhile, the copper sheets are easy to process and mold, can be cut, bent or processed into a required shape according to the requirement, can be better suitable for a sensor, and the copper sheets are preferably used as conductive materials.
In this embodiment, the method further includes: as shown in FIG. 2, an N-channel JFET tube 22 is connected across the anode 13 and the cathode 12 of the electrochemical micro oxygen sensor 11, the grid of the JFET tube is connected with a negative power supply of-5V, and the drain and the source are respectively connected with the anode 13OXY+ and the cathode 12 OXY-of the electrochemical oxygen sensor and then connected to an operational amplifier 23.
Thus, when the oxygen analyzer is not powered on, the drain electrode and the source electrode of the JFET tube are conducted, so that the anode 13 and the cathode 12 of the electrochemical trace oxygen sensor 11 are short-circuited, and when the analyzer is not in operation, as shown in FIG. 4, the trace oxygen in the high-purity nitrogen gas with the sensor in the bypass state is consumed in the electrochemical trace oxygen sensor 11, and the service life of the sensor can be further prolonged.
When the oxygen analyzer is powered on, the drain and source of the N-channel JFET tube 22 are open-circuited because the gate of the JFET tube obtains-5V voltage, and the signal of the electrochemical micro oxygen sensor 11 can be normally transmitted to the operational amplifier 23 for signal processing. Therefore, when the oxygen analyzer is powered on for operation, the purging time of the electrochemical microsensor loop is reduced, and the aim of rapidly detecting trace oxygen impurities in the process sample gas is fulfilled.
In this embodiment, during the period when the oxygen analyzer is not in operation, the electrochemical micro oxygen sensor 11 is installed in the flow cell 43, the four-way ball valve 41 is communicated with the flow cell 43 through the stainless steel pipe 42, and all connections are required to be airtight; before the oxygen analyzer is ready to be shut down, the following steps are performed:
as shown in fig. 3, the handle of the four-way ball valve 41 is at 0 °, the port 1 and the port 2 of the four-way ball valve 41 are communicated, and the port 3 and the port 4 are communicated, so that the four-way ball valve 41 is in a sampling state; introducing nitrogen into the four-way ball valve 41, flowing the nitrogen into the flow cell 43, and filling the circuit of the electrochemical micro oxygen sensor 11 with the nitrogen;
the nitrogen purge is for a time sufficient to give an oxygen analyzer indicator of a few ppm or less;
as shown in fig. 4, the handle of the four-way ball valve 41 is positioned at 90 °, the port 1 and the port 4 of the four-way ball valve 41 are communicated, and the port 2 and the port 3 are communicated, so that the four-way ball valve 41 is positioned in a bypass state, and at the moment, the four-way ball valve 41 shorts the inlet and the outlet of the flow cell 43; sealing the electrochemical micro oxygen sensor 11 in the flow cell 43 in a nitrogen atmosphere;
then, the oxygen analyzer is turned off and the nitrogen source is shut off.
Through the above operation, the electrochemical micro oxygen sensor 11 is in a nitrogen atmosphere, thereby extending the life of the electrochemical micro oxygen sensor 11 during the time when the oxygen analyzer is not in operation (for example, during the plant maintenance).
In this embodiment, as shown in fig. 5, the encapsulation protection of the electrochemical micro oxygen sensor 11 specifically includes:
placing the electrochemical micro oxygen sensor 11 into an anti-static double-layer self-sealing plastic bag 31;
the air inlet conduit 33 is inserted into the plastic bag near the bottom and high-purity nitrogen is introduced;
after the nitrogen is used for swelling the anti-static double-layer self-sealing plastic bag 31, the self-carrying seal of the anti-static double-layer self-sealing plastic bag 31 is used for sealing;
then the air inlet conduit 33 is drawn out to the sealing part of the anti-static double-layer self-sealing plastic bag 31, and high-purity nitrogen is continuously introduced;
finally, the anti-static double-layer self-sealing plastic bag 31 is thermally sealed by a hand-press type sealing machine, so that the electrochemical micro oxygen sensor 11 is in a high-purity nitrogen environment.
The electrochemical micro oxygen sensor 11 detected in the oxygen analyzer is taken down, the encapsulation is performed by the method, and then the encapsulated electrochemical micro oxygen sensor 11 is packaged and transported or stored together with the oxygen analyzer. The electrochemical micro oxygen sensor 11 is not contacted with oxygen after being stored in a nitrogen environment, so that the service life of the sensor in the transportation and storage period is prolonged.
In this embodiment, when the oxygen analyzer arrives at the user site and is just put into operation, the operation steps of the analyzer are as follows:
as shown in fig. 3, the handle of the four-way ball valve 41 is at 0 °, the port 1 and the port 2 of the four-way ball valve 41 are communicated, and the port 3 and the port 4 are communicated, so that the four-way ball valve 41 is in a sampling state; introducing nitrogen into the four-way ball valve 41, allowing the nitrogen to flow into the flow cell 43, and filling the flow cell 43 with nitrogen;
taking out the electrochemical micro oxygen sensor 11 from the sealed anti-static double-layer self-sealing plastic bag 31, pulling out the short-circuit copper sheet 14, rapidly installing the sensor in the flow cell 43 of the oxygen analyzer, and timely pressing the cover of the flow cell 43 to seal the flow cell 43 from air leakage; wherein the contact time between the electrochemical micro oxygen sensor 11 and the air is reduced as much as possible.
Continuously charging nitrogen so that the nitrogen is purged for a long enough time; the purge time may be set according to an actual working condition, for example, 30 minutes. Because the drain electrode and the source electrode of the N-channel JFET tube 22 in the oxygen analyzer circuit are conducted, the oxygen retained in the electrochemical micro oxygen sensor 11 can be rapidly consumed, so that the operation time of the analyzer is saved.
The oxygen analyzer is energized (at this time, the drain and source of the N-channel JFET tube 22 in the oxygen analyzer circuit are open, and do not affect the measurement), the oxygen measurement indication change of the oxygen analyzer is observed, and when the oxygen indication is near zero, the oxygen analyzer is put into operation on the sample process sample gas, and the oxygen content of the sample gas is measured.
In this embodiment, the method further includes: the temperature response of the electrochemical oxygen sensor is parameterized for temperature compensation. On one hand, the electrochemical trace measurement value has larger change of indication value influenced by temperature; on the other hand, the higher the temperature, the greater the sensor consumption and the shorter the sensor lifetime. The influence of the environmental temperature change on the measurement indication value of the electrochemical trace oxygen analyzer is eliminated by adopting a software temperature compensation method, so that the sensor works at normal temperature, and the service life of the sensor can be prolonged.
Through software temperature compensation, parameterized temperature compensation can be carried out on the temperature response of each electrochemical oxygen sensor, for example, a temperature correction curve is created, analysis results at different temperatures are recorded, the data can be used for formulating correction factors so as to correct measurement results according to the current environment temperature, and the measurement values are automatically adjusted according to real-time temperature data, so that accurate measurement can be obtained, and the service life of the sensor can be prolonged.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (7)
1. A method for prolonging the service life of an electrochemical trace oxygen sensor is characterized by comprising the following steps: comprising the following steps: the anode and the cathode of the electrochemical micro oxygen sensor are short-circuited by using a conductive material.
2. The method for extending the service life of an electrochemical micro-oxygen sensor according to claim 1, wherein: the conductive material is one of copper sheet, aluminum sheet, iron sheet and silver sheet.
3. The method for extending the service life of an electrochemical micro-oxygen sensor according to claim 1, wherein: further comprises:
an N-channel JFET tube is bridged between an anode and a cathode of the electrochemical micro oxygen sensor, the grid electrode of the JFET tube is connected with a negative power supply, and the drain electrode and the source electrode of the JFET tube are respectively connected with an anode OXY+ and a cathode OXY-of the electrochemical oxygen sensor and then connected to an operational amplifier.
4. The method for extending the service life of an electrochemical micro-oxygen sensor according to claim 1, wherein: during the period that the oxygen analyzer is not in operation, the electrochemical micro oxygen sensor is arranged in the flow cell, and the four-way ball valve is communicated with the flow cell through a stainless steel pipeline; the method comprises the following steps:
the handle of the four-way ball valve is positioned at 0 DEG, the port 1 and the port 2 of the four-way ball valve are communicated, and the port 3 and the port 4 are communicated, so that the four-way ball valve is in a sampling state; introducing nitrogen into the four-way ball valve, flowing the nitrogen into the flow cell, and filling nitrogen into the electrochemical micro oxygen sensor loop;
the nitrogen purge is for a time sufficient to give an oxygen analyzer indicator of a few ppm or less;
the handle of the four-way ball valve is positioned at 90 degrees, the port 1 and the port 4 of the four-way ball valve are communicated, and the port 2 and the port 3 are communicated, so that the four-way ball valve is in a bypass state; the electrochemical micro oxygen sensor in the flow cell was sealed in a nitrogen atmosphere.
5. The method for extending the service life of an electrochemical micro-oxygen sensor according to claim 1, wherein: the method for encapsulating and protecting the electrochemical micro oxygen sensor specifically comprises the following steps of:
placing an electrochemical trace oxygen sensor into an anti-static double-layer self-sealing plastic bag;
inserting an air inlet guide pipe into the plastic bag close to the bottom, and introducing high-purity nitrogen;
after the nitrogen is used for swelling the anti-static double-layer self-sealing plastic bag, the self-carrying seal of the anti-static double-layer self-sealing plastic bag is used for sealing;
then the air inlet conduit is drawn out to the sealing part of the anti-static double-layer self-sealing plastic bag, and high-purity nitrogen is continuously introduced;
finally, the anti-static double-layer self-sealing plastic bag is thermally sealed by a hand-press type sealing machine, so that the electrochemical micro oxygen sensor is in a high-purity nitrogen environment.
6. The method for extending the service life of an electrochemical micro-oxygen sensor according to claim 1, wherein: when the oxygen analyzer is put into operation, the operation is performed according to the following steps:
the handle of the four-way ball valve is positioned at 0 DEG, the port 1 and the port 2 of the four-way ball valve are communicated, and the port 3 and the port 4 are communicated, so that the four-way ball valve is in a sampling state; introducing nitrogen into the four-way ball valve, allowing the nitrogen to flow into the flow cell, and filling the flow cell with nitrogen;
taking out the electrochemical micro oxygen sensor from the sealed anti-static double-layer self-sealing plastic bag, pulling out the short-circuit copper sheet, rapidly installing the sensor in a flow cell of the oxygen analyzer, and timely compacting a cover of the flow cell to seal the flow cell from air leakage;
continuously charging nitrogen so that the nitrogen is purged for a long enough time;
the oxygen analyzer is electrified, the oxygen measurement indication value change of the oxygen analyzer is observed, and when the oxygen indication value is close to zero, the oxygen analyzer is put into operation on the sample gas of the sampling process, and the oxygen content of the sample gas is measured.
7. The method for extending the service life of an electrochemical micro-oxygen sensor according to claim 1, wherein: further comprises: the temperature response of the electrochemical oxygen sensor is parameterized for temperature compensation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311463145.0A CN117405754A (en) | 2023-11-06 | 2023-11-06 | Method for prolonging service life of electrochemical trace oxygen sensor |
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| CN202311463145.0A CN117405754A (en) | 2023-11-06 | 2023-11-06 | Method for prolonging service life of electrochemical trace oxygen sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118022123A (en) * | 2024-03-29 | 2024-05-14 | 广州蓝仕威克医疗科技有限公司 | Protection method and device for electrochemical oxygen sensor of breathing machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118022123A (en) * | 2024-03-29 | 2024-05-14 | 广州蓝仕威克医疗科技有限公司 | Protection method and device for electrochemical oxygen sensor of breathing machine |
| CN118022123B (en) * | 2024-03-29 | 2024-09-03 | 广州蓝仕威克医疗科技有限公司 | Protection method and device for electrochemical oxygen sensor of breathing machine |
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