WO2000014524A1 - Examen de detecteur electrochimique de gaz - Google Patents
Examen de detecteur electrochimique de gaz Download PDFInfo
- Publication number
- WO2000014524A1 WO2000014524A1 PCT/JP1998/004044 JP9804044W WO0014524A1 WO 2000014524 A1 WO2000014524 A1 WO 2000014524A1 JP 9804044 W JP9804044 W JP 9804044W WO 0014524 A1 WO0014524 A1 WO 0014524A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor
- gas
- gas component
- electrochemical
- concentration
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000007789 gas Substances 0.000 claims abstract description 121
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 52
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 52
- 239000001257 hydrogen Substances 0.000 claims abstract description 41
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 41
- 238000012360 testing method Methods 0.000 claims description 17
- 230000006866 deterioration Effects 0.000 claims description 15
- 238000007254 oxidation reaction Methods 0.000 claims description 12
- 238000006722 reduction reaction Methods 0.000 claims description 11
- 230000009467 reduction Effects 0.000 claims description 10
- 238000005868 electrolysis reaction Methods 0.000 claims description 9
- 230000003647 oxidation Effects 0.000 claims description 9
- 238000012795 verification Methods 0.000 claims description 9
- 239000008151 electrolyte solution Substances 0.000 claims description 7
- 238000012937 correction Methods 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 2
- 238000003556 assay Methods 0.000 claims 1
- 239000003990 capacitor Substances 0.000 claims 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 37
- 238000006243 chemical reaction Methods 0.000 abstract description 28
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 16
- 239000001301 oxygen Substances 0.000 abstract description 16
- 229910052760 oxygen Inorganic materials 0.000 abstract description 16
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 9
- 239000003792 electrolyte Substances 0.000 description 8
- 239000012528 membrane Substances 0.000 description 8
- 239000003054 catalyst Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 150000002431 hydrogen Chemical class 0.000 description 7
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- 238000003411 electrode reaction Methods 0.000 description 5
- 208000005374 Poisoning Diseases 0.000 description 4
- 231100000572 poisoning Toxicity 0.000 description 4
- 230000000607 poisoning effect Effects 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 238000006479 redox reaction Methods 0.000 description 2
- 230000001603 reducing effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000007900 aqueous suspension Substances 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- -1 ruthenium Chemical class 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 239000010457 zeolite Substances 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
- G01N27/416—Systems
- G01N27/4163—Systems checking the operation of, or calibrating, the measuring apparatus
-
- 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
- G01N27/404—Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid, e.g. Clark-type oxygen sensors
- G01N27/4045—Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid, e.g. Clark-type oxygen sensors for gases other than oxygen
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/004—CO or CO2
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/007—Arrangements to check the analyser
Definitions
- the present invention relates to a method for testing an electrochemical gas sensor used for measuring the concentration of a component of carbon monoxide gas. More specifically, gas alarms, which are always installed in ships, manholes, tunnels and general households, are widely used for preventing poisoning accidents due to exhaust gas, heating equipment and exhaust gas from automobiles, early detection of fires, prevention of explosion and fire, etc.
- the present invention relates to a verification method for judging an operation state of an electrochemical gas sensor used in a vessel. Background art
- An electrochemical gas sensor is a sensor that guides a gas component to be detected through a diaphragm onto a working electrode having a catalytic action, and oxidizes or reduces the gas to output a voltage or current according to the gas concentration. Since it is small, lightweight, operates at room temperature and pressure, has high reliability and is relatively inexpensive, it is widely used for poisoning alarms and industrial measuring instruments.
- FIG. 2 shows a general electric circuit for electrically driving such an electrochemical gas sensor to obtain an output.
- the principle of operation of the electrochemical gas sensor will be described with reference to FIG.
- the sensor uses a synthetic resin holder (9), an oxygen-permeable membrane holder (6), and a diaphragm holder (14) to produce a gas-permeable diaphragm (12), a working electrode (11), and a counter electrode (11). 8), reference electrode (13), electrolyte holding material (10), and lead 'wires (1), (2), (4) for electrical conduction to each electrode are arranged. 7) is sealed inside.
- the electrode is a catalyst whose main component is a noble metal such as platinum or platinum black, and efficiently oxidizes a gas having a reducing effect, such as carbon monoxide or hydrogen, or a gas having an oxidizing effect on the working electrode (11). Or reduce.
- the potential of the working electrode (11) is shown in Fig. 2 with respect to the potential of the reference electrode (13).
- a value convenient for the oxidation-reduction reaction of the gas is maintained by an external circuit. In this case, no current flows into and out of the reference electrode, which is a potential reference, and the reference electrode only regulates the potential of the working electrode and does not participate in the reaction.
- the potential of the counter electrode is not regulated, the potential of the counter electrode is a natural electrode potential corresponding to the reaction at the working electrode. Therefore, the oxidation-reduction reaction of the gas to be measured occurs only on the working electrode, and the reaction on the other side occurs only on the counter electrode.
- the senor operates normally due to external factors such as the members constituting the sensor, the deterioration over time of the electrical contact conduction state, and contamination of the diaphragm through which gas diffuses and permeates. May disappear.
- an electrolytic solution wherein the sensor output, which is the value of the oxidation current or the reduction current of the first gas component, is calculated to detect the concentration of the first gas component.
- a voltage at which a current flows in a direction opposite to the oxidation current or reduction current of the first gas component is applied from the outside between the working electrode and the counter electrode, and the second gas component is subjected to a predetermined concentration by electrolysis of the electrolytic solution.
- a method for testing an electrochemical gas sensor that exhibits a sensor output substantially proportional to the sensor output of the first gas component at a concentration corresponding to the concentration.
- the sensor is tested using a correction value that is a ratio between a second gas component concentration calculated from a measured sensor output based on a known standard and the predetermined concentration of the second gas component.
- test is calibration, and / or deterioration judgment, and / or life judgment.
- a control device for an electrochemical gas sensor comprising a test means according to the test method described in (4).
- the electrode potential is temporarily manipulated from the outside, and a gas having the same effect as when the calibration gas flows is generated on the electrode. And then return to normal potential to remove any residual gas generated.
- 5--Deterioration of the sensor can be determined based on the reaction of the sensor, and the sensor can be calibrated without actually using a calibration gas containing carbon monoxide.
- FIG. 1 is a diagram showing a structural cross section of an electrochemical carbon monoxide gas sensor.
- FIG. 2 is a diagram showing an electric circuit for driving and outputting an electrochemical carbon monoxide gas sensor.
- FIG. 3 is a graph showing the results of actually measuring the reaction characteristics of an electrochemical carbon monoxide gas sensor for showing the function and effect of the present invention.
- FIG. 4 is a graph showing the results of actual measurement of the reaction characteristics of an electrochemical carbon monoxide gas sensor in which the diaphragm was contaminated to show the function and effect of the present invention.
- FIG. 5 is a view showing the results of actual measurement of the reaction characteristics of an electrochemical carbon monoxide gas sensor in which the amount of an electrode catalyst for showing the function and effect of the present invention was reduced.
- FIG. 6 is a graph showing the results of actual measurement of current-voltage characteristics of an electrochemical carbon monoxide gas sensor for showing the function and effect of the present invention.
- 1 is a reference electrode lead wire
- 2 is a counter electrode lead wire
- 3 is a 0-ring
- 4 is a working electrode lead wire
- 5 is an oxygen permeable membrane
- 6 is an oxygen permeable membrane.
- 7 is an electrolyte
- 8 is a counter electrode
- 9 is a holder
- 10 is an electrolyte holding material
- 11 is a working electrode
- 1 2 is a gas permeable diaphragm
- 1 3 is a reference electrode
- 14 is a diaphragm holder.
- Electrochemical carbon monoxide gas sensors use a catalytic electrode to oxidize carbon monoxide and reduce oxygen, and use the current resulting from the reaction as a means for detecting gas concentration.
- the electrode is effective not only for carbon monoxide but also for other reactive gases.
- the reaction to hydrogen is the same as the reaction to carbon monoxide, if the deviation from the reference value is extremely large by comparing the sensor current at that time with the reference value obtained in advance, the deterioration of the carbon monoxide sensor A large degree indicates that the degree of deterioration is small if the difference is small.
- the reference sensor output specifically means a sensor output when hydrogen is generated by electrolyzing the electrolyte water for a certain period of time using a carbon monoxide gas sensor and left for a certain period of time. It may be a value measured during the same hydrogen generation time and leaving time before measurement at the time of deterioration determination or calibration.
- the comparison may be performed in a front-rear relationship while periodically obtaining the sensor output as described above.
- the reference hydrogen concentration was obtained by converting the sensor output using a calibration curve or the like. Means hydrogen concentration.
- the concentration of hydrogen generated on the working electrode is 100%, which corresponds to the concentration of carbon monoxide, which is the target of normal measurement, 10 to 1, ppm ppm
- the power s which is a concentration that is much higher than the concentration of hydrogen
- the time for electrolysis of water is short, and measurement is performed after an appropriate time
- most of the hydrogen will diffuse into the outside air. Since an appropriate amount of hydrogen remains near the electrode, there is no problem.
- the water in the electrolytic solution is consumed by the electrolysis of water. Similarly, if the time for performing the electrolysis of water is shortened, the amount of water consumed is very small, and there is a problem in the function of the sensor. There is no.
- a catalyst that selectively reacts with hydrogen such as ruthenium, is used in front of the gas introduction part of the sensor to remove hydrogen.
- Selective reaction removal or selective removal of hydrogen by using the difference in the adsorption rate between hydrogen and carbon monoxide, using an adsorbent such as activated carbon or zeolite in the same stage before the gas introduction section
- an adsorbent such as activated carbon or zeolite
- an electrochemical carbon monoxide sensor having the structure shown in FIG. 1 was prototyped and its effects were confirmed.
- the working electrode, counter electrode, and reference electrode are made of a mesh-shaped stainless steel plate and used as a catalyst with a suspension of platinum black in water and an aqueous suspension of tetrafluoroethylene polymer (Mitsui Fluorochemicals, product name: 30- J) was kneaded under heat and pressure.
- a platinum wire was used for each lead wire.
- a gas permeable diaphragm a 0.3 mm thick porous fluororesin membrane (manufactured by Sumitomo Electric Industries, trade name: Fluoropore FY-050), and as an oxygen permeable membrane, a 0.1 mm thick porous membrane A flexible fluororesin film (Nitto Denko, trade name NTF-111 2) was punched into a predetermined shape and used.
- sulfuric acid having a concentration of 6 m 01 / L was used as the electrolyte.
- the potentials of the working electrode and the counter electrode are measured using a constant-potential generator (Hokuto Denko potentiostat) as a function of the operational amplifier shown in Fig. 2, and with reference to the potential of the reference electrode. Set the potential of And the sensor output was measured.
- a constant-potential generator Hokuto Denko potentiostat
- Figure 3 shows the output current of the sensor for various concentrations of carbon monoxide and hydrogen, the force indicating the ratio of the output for carbon monoxide to the output for hydrogen, and the response characteristics of the sensor for both values. Although there was a difference, the same tendency was observed, and the output ratio was constant regardless of the concentration.
- the sensor output from carbon monoxide has a one-to-one relationship with the output from hydrogen, and the concentration of the other gas can be known from the output value for either gas.
- Hydrogen gas was found to be effective as a calibration or / and deterioration determination gas for an electrochemical carbon monoxide sensor.
- Fig. 4 shows the measurement results of the output characteristics of the sensor in which the gas permeable diaphragm was contaminated
- Fig. 5 shows the measurement results of the output characteristics of the sensor in which the amount of catalyst was reduced.
- the main force ratio was constant regardless of the concentration.
- the sensor output by carbon monoxide has a one-to-one relationship with the output by hydrogen, not only in the normal measurement range but also in abnormal cases.
- Hydrogen gas was effective as a calibration gas for electrochemical carbon monoxide sensors and / or as a deterioration judgment gas because the output value of either gas could be used to determine the concentration of the other gas.
- Fig. 6 shows the results.
- the vertical axis represents the potential of the working electrode with respect to the reference electrode (0 V).
- the reaction on the other side of the working electrode reaction occurs on the counter electrode.
- the positive portion of the vertical axis indicates that the working electrode acts as the anode, that is, the side on which oxygen is generated, and the negative portion, on which the working electrode functions as the cathode, that is, the side on which hydrogen is generated.
- the theoretical water decomposition voltage is 1.23 V, as is commonly known.
- the potential of the working electrode with respect to the potential of the reference electrode of the sensor is set to 1 600 mV or less, hydrogen can be generated on the working electrode.
- the present invention it is possible to calibrate an electrochemical carbon monoxide sensor and judge deterioration only by applying a voltage from the outside periodically, and to use a calibration gas containing carbon monoxide. This eliminates the need to actually distribute calibration data to the sensor and perform calibration work, making it possible for calibration workers to perform calibration work easily and regularly without risk of exposure to carbon monoxide gas for calibration. it can.
- the senor can be automatically calibrated or detected automatically by an external electric signal, and when the concentration of carbon monoxide in the environment actually increases and there is a risk of poisoning, the sensor can operate normally. It is possible to significantly reduce the risk of not operating and giving no alarm.
- the present invention greatly contributes to industry.
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Pathology (AREA)
- Physics & Mathematics (AREA)
- Immunology (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
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Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9135975A JPH10311815A (ja) | 1997-05-09 | 1997-05-09 | 電気化学式一酸化炭素ガスセンサの劣化判定方法および校正方法 |
EP98941782A EP1039293A4 (en) | 1997-05-09 | 1998-09-09 | METHOD FOR TESTING ELECTROCHEMICAL GAS SENSORS |
US09/530,906 US6404205B1 (en) | 1997-05-09 | 1998-09-09 | Method for testing the reliability of an electrochemical gas sensor |
PCT/JP1998/004044 WO2000014524A1 (fr) | 1997-05-09 | 1998-09-09 | Examen de detecteur electrochimique de gaz |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9135975A JPH10311815A (ja) | 1997-05-09 | 1997-05-09 | 電気化学式一酸化炭素ガスセンサの劣化判定方法および校正方法 |
PCT/JP1998/004044 WO2000014524A1 (fr) | 1997-05-09 | 1998-09-09 | Examen de detecteur electrochimique de gaz |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000014524A1 true WO2000014524A1 (fr) | 2000-03-16 |
Family
ID=26439229
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1998/004044 WO2000014524A1 (fr) | 1997-05-09 | 1998-09-09 | Examen de detecteur electrochimique de gaz |
Country Status (3)
Country | Link |
---|---|
US (1) | US6404205B1 (ja) |
EP (1) | EP1039293A4 (ja) |
WO (1) | WO2000014524A1 (ja) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7435321B2 (en) * | 2001-05-25 | 2008-10-14 | Figaro Engineering Inc. | Proton conductor gas sensor |
EP1281957A1 (de) * | 2001-07-30 | 2003-02-05 | Siemens Building Technologies AG | Melder für brennbare Gase mit einer Einrichtung zur Selbstüberwachung |
US7046012B2 (en) * | 2001-11-20 | 2006-05-16 | Ion Science Limited | Ionization devices |
DE10215909C1 (de) * | 2002-04-11 | 2003-10-09 | Draegerwerk Ag | Verfahren und Vorrichtung zur Überwachung der Wasserstoffkonzentration |
US7413645B2 (en) | 2004-05-05 | 2008-08-19 | Mine Safety Appliances Company | Devices, systems and methods for testing gas sensors and correcting gas sensor output |
US7611671B2 (en) * | 2005-10-14 | 2009-11-03 | Aperon Biosystems Corp. | Reduction of carbon monoxide interference in gaseous analyte detectors |
DE102009024573A1 (de) * | 2009-06-10 | 2010-12-23 | Novar Gmbh | Verfahren und Schaltung zur Prüfung eines Kohlenmonoxid-Sensors |
US8888987B2 (en) | 2010-11-09 | 2014-11-18 | Empire Technology Development Llc | Gas sensor testing device |
US9289714B1 (en) | 2014-10-17 | 2016-03-22 | JuvanCo Industries, LLC | Device for adsorbing the hydrogen sulfide component of exhausted calibration gases |
JP6576053B2 (ja) * | 2015-03-06 | 2019-09-18 | 新コスモス電機株式会社 | 定電位電解式ガスセンサ |
US10197525B2 (en) | 2015-12-21 | 2019-02-05 | Msa Technology, Llc | Pulsed potential gas sensors |
DE102016212664A1 (de) | 2016-07-12 | 2018-01-18 | Msa Europe Gmbh | Elektrochemisches Verfahren zum Bestimmen der Empfindlichkeit eines Gassensors durch Impulssequenzen |
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JPH10311815A (ja) * | 1997-05-09 | 1998-11-24 | Japan Storage Battery Co Ltd | 電気化学式一酸化炭素ガスセンサの劣化判定方法および校正方法 |
US6001240A (en) * | 1997-07-02 | 1999-12-14 | Mine Safety Appliances Company | Electrochemical detection of hydrogen cyanide |
US6222372B1 (en) * | 1997-11-21 | 2001-04-24 | Denso Corporation | Structure of gas sensor |
US6165347A (en) * | 1999-05-12 | 2000-12-26 | Industrial Scientific Corporation | Method of identifying a gas |
-
1998
- 1998-09-09 WO PCT/JP1998/004044 patent/WO2000014524A1/ja not_active Application Discontinuation
- 1998-09-09 US US09/530,906 patent/US6404205B1/en not_active Expired - Lifetime
- 1998-09-09 EP EP98941782A patent/EP1039293A4/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58143262A (ja) * | 1982-02-22 | 1983-08-25 | Hitachi Ltd | ガスセンサ |
JPH04190154A (ja) * | 1990-11-26 | 1992-07-08 | New Cosmos Electric Corp | 定電位電解式ガスセンサの機能点検方法とその装置 |
JPH07504973A (ja) * | 1991-11-11 | 1995-06-01 | エム エス テー マイクロ−センサー−テヒノロギー ゲゼルシャフト ミット ベシュレンクテル ハフツング | ガス濃度を測定するための電気化学的センサー |
Non-Patent Citations (1)
Title |
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See also references of EP1039293A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP1039293A4 (en) | 2000-12-13 |
EP1039293A1 (en) | 2000-09-27 |
US6404205B1 (en) | 2002-06-11 |
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