GB2167192A - Gas sensor - Google Patents
Gas sensor Download PDFInfo
- Publication number
- GB2167192A GB2167192A GB08528233A GB8528233A GB2167192A GB 2167192 A GB2167192 A GB 2167192A GB 08528233 A GB08528233 A GB 08528233A GB 8528233 A GB8528233 A GB 8528233A GB 2167192 A GB2167192 A GB 2167192A
- Authority
- GB
- United Kingdom
- Prior art keywords
- region
- sensor device
- electrical sensor
- pellet
- exhibiting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000463 material Substances 0.000 claims abstract description 73
- 230000005678 Seebeck effect Effects 0.000 claims abstract description 16
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims abstract description 16
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000001257 hydrogen Substances 0.000 claims abstract description 11
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims abstract description 8
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000004065 semiconductor Substances 0.000 claims abstract description 7
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 claims abstract description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 3
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910002113 barium titanate Inorganic materials 0.000 claims abstract description 3
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 3
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims abstract 2
- 239000008188 pellet Substances 0.000 claims description 29
- 230000003197 catalytic effect Effects 0.000 claims description 28
- 230000001747 exhibiting effect Effects 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 13
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 9
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 9
- 125000000219 ethylidene group Chemical group [H]C(=[*])C([H])([H])[H] 0.000 claims description 4
- 229910052763 palladium Inorganic materials 0.000 claims description 4
- 229910052697 platinum Inorganic materials 0.000 claims description 4
- 239000003863 metallic catalyst Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims description 2
- 229910052741 iridium Inorganic materials 0.000 claims description 2
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims description 2
- 239000011253 protective coating Substances 0.000 claims description 2
- 229910052707 ruthenium Inorganic materials 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 12
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 abstract 1
- 239000005977 Ethylene Substances 0.000 abstract 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 8
- 239000003054 catalyst Substances 0.000 description 8
- 239000008246 gaseous mixture Substances 0.000 description 6
- 229910018879 Pt—Pd Inorganic materials 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 2
- 231100000572 poisoning Toxicity 0.000 description 2
- 230000000607 poisoning effect Effects 0.000 description 2
- 229940105305 carbon monoxide Drugs 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000012254 powdered material Substances 0.000 description 1
- 150000004763 sulfides Chemical class 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
- G01N27/02—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
- G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
- G01N27/16—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by burning or catalytic oxidation of surrounding material to be tested, e.g. of gas
-
- 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
- G01N33/0027—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
- G01N33/0044—Sulphides, e.g. H2S
-
- 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
- G01N33/0047—Organic compounds
-
- 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
- G01N33/005—H2
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Catalysts (AREA)
Abstract
In a device for sensing gases, such as hydrogen, carbon monoxide, ethylene or hydrogen sulphide, in air, a material 1 has one end coated with a layer 2 for catalysing a desired reaction with the production of heat and thus a temperature differential between the end of the material, and the sensor is arranged to produce a voltage in response thereto by the Seebeck effect. Material 1 may be an oxide semiconductor, e.g. tin dioxide, vanadium pentoxide, chromic oxide, or barium titanate, or are usable with sulphide present, e.g. molybdenum disulphide. <IMAGE>
Description
SPECIFICATION
Improvements in or relating to sensors
The present invention relates to sensors and more particularly to electrical sensor devices which are suitable for use in gases and gaseous mixtures.
According to one aspect of the present invention there is provided an electrical sensor device which includes a material capable of exhibiting a Seebeck effect, said material being a semiconductor oxide material or a material capable of sensing a sulphide, having a first region and a second region, one of the regions being capable of catalysing a given chemical reaction such that a difference in temperature may be developed between the first region and the second region in order that a Seebeck voltage may be developed between the first and second regions.
The sensor device may include a means for measuring the Seebeck voltage.
Examples of semiconductor oxide materials which may be used in sensor devices in accordance with the present invention are tin dioxide, vanadium pentoxide, chromic oxide, and barium titanate. Molybdenum disulphide is a further example of material suitable for use in accordance with the present invention as a material capable of exhibiting a Seebeck effect. Molybdenum disulphide may be used in sensing sulphides (e.g. hydrogen sulphide). It is to be understood that some semiconductor oxide materials may be capable of sensing a sulphide.
In this Specification "capable of sensing a sulphide" is used to embrace materials which are capable of exhibiting a Seebeck voltage when incorporated in a sensor device in accordance with the present invention and contacted with a sulphide in a gas or gaseous mixture.
A region of the material may be arranged to be capable of catalysing a chemical reaction by provision thereon of a catalytic material.
Thus, for example, a metallic catalyst such as platinum, platinum-palladium, iridium or ruthenium may be provided at a region of the material.
By way of example a sensor device of the present invention may be used to detect, in air, gases such as hydrogen, carbon monox
ide, C2H4 and H2S.
It is preferred that the material capable of
exhibiting a Seebeck effect is porous in order to provide adequate surface area for contact
with a gas or gaseous mixture.
Also, porosity can faciliatate the retention of
heat produced during a catalysed reaction.
An electrical sensor device in accordance
with one embodiment of the present invention
may comprise a pellet of material capable of
exhibiting a Seebeck effect, said material being
a semiconductor oxide material or material capable of sensing a sulphide, having a region provided with a catalytic material and a region not having a catalytic material, and means for measuring a Seebeck voltage between the two regions.
Surface parts of the pellet not provided with a catalytic material may, optionally, be provided with a protective coating (e.g. of Au) to protect against possible "poisoning" by reaction products.
The means for measuring a Seebeck voltage may be, for example, a voltmeter (e.g. a digital voltmeter) the input impedance of which is selected to be sufficiently low that a rest voltage in air is avoided but sufficiently high that no significant current is drawn from the material.
In one embodiment of the present invention a pellet for use in accordance with the present invention may be prepared by pressing the material capable of exhibiting a Seebeck effect in powder form to give a porous pellet.
A catalytic material may be sputtered onto a region of the material to provide a region having a catalytic material.
In another embodiment of the present invention a pellet for use in accordance with the present invention may be prepared by pressing a material, capable of exhibiting a Seebeck effect, in powder form and a mixture of said material in powder form and a catalytic material in powder form such that a porous pellet is formed having a region with a catalytic material and a region not having a catalytic material.
Thus, for example in accordance with the immediately foregoing embodiment of the invention a material, capable of exhibiting a Seebeck effect, in powdered form may be introduced into a die and a mixture of said material in powdered form and a catalytic material in powder form may then be added to the die to give two regions of powdered material is the die. Pressing may then be carried out to give a porous pellet having a region a catalytic material and a region not having a catalytic material.
It is to be understood that an electrical sensor device in accordance with the present invention can operate at substantially room temperature and thus the requirement of providing a heating means may be avoided.
It is to be understood, however, that if desired a sensor device in accordance with the
present invention may be operated at an elevated temperature. Thus, for example, a sen
sor device in accordance with the present invention may be operated at, for example,
around 10000. An increase in magnitude of
response and speed of response may be
achieved with certain materials at elevated
temperatures of around 100 C (e.g. the re
sponse to hydrogen sulphide of a sensor de
vice having molybdenum disulphide as the ma
terial capable of exhibiting a Seebeck voltage was increased in magnitude and speed by operating at around 100"C). When compared with the power requirements of known devices operating at 300 to 4000C the power requirements for operating a sensor in accordance with the present invention at around 100 C is relatively small.
It is also to be understood that since the measured voltage is developed by a temperature difference between regions of the material (Seebeck effect) the requirement of providing an external electrical supply as is necessary in the case of a sensor working on, for example, resistivity changes, is substantially avoided (i.e. a device in accordance with the present invention may be substantially "self-powered").
It will be appreciated that in operation a gaseous mixture may be passed over a sensor device in accordance with the present invention and at a region carrying a catalytic material a chemical reaction may occur (e.g. the combustion of gases such as H2, CO, C2H4 or
H2S) which gives rise to an increase in temperature whilst another region of the material (not carrying a catalytic material) may remain at substantially ambient temperature. The resulting temperature difference gives rise to a voltage by virtue of the Seebeck effect and the voltage is measured. The magnitude of the voltage is related to the concentration in the gaseous mixture of gas which gives rise to the chemical reaction. Thus it is possible, for example, to detect gases (e.g. H2, CO, C2H4 and H2S) in air.
Sensor devices in accordance with the present invention are believed to be less prone to moisture "poisoning" than are resistance modulating devices.
The invention will now be further described, by way of example only, with reference to the accompanying drawings and with reference to the Examples 1 to 8.
In the Drawings:
Figure l is a diagrammatic representation of an electrical sensor device in accordance with the invention;
Figure 2 shows the voltage response of an electrical sensor device in accordance with the invention to varying concentrations of hydrogen in air;
Figure 3 shows the voltage response of an electrical sensor device in accordance with the present invention to a 5 second pulse of 1% hydrogen in air; and
Figure 4 shows the voltage response of an electrical sensor device in accordance with the present invention to hydrogen sulphide in air.
Referring now to Fig. 1, there is shown an electrical sensor device comprising a cylindrical pellet 1 of material capable of exhibiting a
Seebeck effect having, region 2 coated with a catalytic material and a region 3 not coated with a catalytic material. Electrodes 4 and 5 are provided and are connected via conductors 6 and 7 respectively to a voltage measuring means 8.
In operation a gaseous mixture containing a gas to be detected is passed over pellet 1 and a chemical reaction involving the gas is catalysed at region 2 with a resulting rise in temperature.
A Seebeck voltage is developed between the region 2 and region 3 due to the temperature difference between the regions 2 and 3 and the voltage is measured by voltage measuring means 8.
Examples 1 to 6
A sensor device of the form shown in Fig.
1 of the accompanying drawings was used to detect hydrogen in air.
The sensor device had a pellet of tin dioxide having a region having a Pt-Pd catalyst. Two
Au electrodes were sputtered onto opposite end faces of the pellet (i.e. one electrode was formed on a Pt-Pd catalyst and one electrode was formed on a region not having a catalyst). The electrodes were connected to a voltage measuring device (DVM) via Cu wires.
The pellet was formed by pressing a layer of tin dioxide powder and a layer of tin dioxide powder mixed with powdered platinum and palladium in a die. The pellet after pressing had a region of porous tin dioxide and a region of porous tin dioxide provided with a platinum-Pd catalytic material.
The pellet was placed in an enclosure and alternately air containing a given hydrogen content and argon was passed over the pellet.
When air containing hydrogen was passed over the pellet a chemical reaction was catalysed by the catalytic material at the region coated with Pt-Pd catalyst giving a rise in temperature. A Seebeck voltage developed between this region and the region not provided with a catalytic material which remained substantially at room temperature.
The response of the sensor is given in Fig.
2 wherein the Seebeck voltage developed is shown for samples of air containing various amounts of hydrogen.
The amounts of hydrogen were 0.15% (Example 1), 0.30% (Example 2), 0.45% (Example 3), 0.60% (Example 4), 0.75% (Example 5) and 0.90% (Example 6).
The samples of air containing hydrogen were alternated with argon.
Example 7
A sensor device of the type used in
Examples 1 to 6 was exposed to a 5 second pulse of 1 per cent H2 in air and the response measured. The response is shown in Fig. 3.
Example 8
A sensor device of the form shown in Fig.
1 of the accompanying drawings was used to detect hydrogen sulphide in air.
The sensor device had a pellet of molyb denum disulphide having a region having a Pt
Pd catalyst. Two Au electrodes were sputtered onto opposite end faces of the pellet (i.e. one electrode was formed on a region having a Pt-Pd catalyst and one electrode was formed on a region not having a catalyst). The electrodes were connected to a voltage measuring device (DVM) via Cu wires. The pellet was formed by pressing a layer of molybenum disulphide powder and a layer of molydenum disulphide powder mixed with powdered platinum and palladium in a die. The pellet after pressing had a region of porous molybdenum disulphide and a region of porous molybdenum disulphide provided with a platinum-Pd catalytic material.
The pellet was placed in an enclosure and heated to about 110"C and air was passed over the pellet.
When air containing 1000 ppm hydrogen sulphide was passed over the pellet a chemical reaction was catalysed by the catalytic material at the region coated with Pt-Pd catalyst giving a rise in temperature. A Seebeck voltage developed between this region and the region not provided with a catalytic material which remained substantially at room temperature.
The response of the sensor is given in Fig.
4 wherein the Seebeck voltage developed is shown for air containing 1000 ppm hydrogen sulphide at 1 1 0 C.
It will be appreciated that "Gas On" and "Gas Off" in the Figure indicate, respectively, the point in time at which air containing 1000 ppm hydrogen sulphide was introduced to the sensor and the point in time at which air containing 1000 ppm hydrogen sulphide was replaced by air.
Claims (12)
1. An electrical sensor device which includes a material capable of exhibiting a Seebeck effect, said material being a semiconductor oxide material or a material capable of sensing a sulphide, having a first region and a second region, one of the regions being capable of catalysing a given chemical reaction such that a difference in temperature may be developed between the first region and the second region in order that a Seebeck voltage may be developed between the first and second regions.
2. An electrical sensor device as claimed in
Claim 1 wherein the material capable of exhibiting a Seebeck effect is tin dioxide, vanadium pentoxide, chromic oxide, barium titanate or molybdenum disulphide.
3. An electrical sensor device as claimed in
Claim 1 or Claim 2 wherein a metallic catalyst is provided at a region of the material.
4. An electrical sensor device as claimed in
Claim 3 wherein the metallic catalyst is platinum, platinum-palladium, iridium or ruthenium.
5. An electrical sensor device as claimed in any one of Claims 1, 2, 3, or 4 wherein the material is such that the sensor is capable of detecting hydrogen, carbon monoxide, C2H4 or
H2S.
6. An electrical sensor device as claimed in any one of the preceding claims wherein the material is porous.
7. An electrical sensor device as claimed in any one of the preceding claims comprising a pellet of material capable of exhibiting a Seebeck effect, said material being a semiconductor oxide material or a material capable of sensing a sulphide, having a region provided with a catalytic material and a region not having a catalytic material, and means for measuring a Seebeck voltage between the two regions.
8. An electrical sensor device as claimed in
Claim 7 wherein surface parts of the pellet not provided with a catalytic material are provided with a protective coating.
9. An electrical sensor device as claimed in
Claim 7 or Claim 8 wherein the pellet is prepared by pressing the material capable of exhibiting a Seebeck effect in powder form to give a porous pellet.
10. An electrical sensor device as claimed in Claim 7 or Claim 8 wherein the pellet is prepared by pressing a material, capable of exhibiting a Seebeck effect, in powder form and a mixture of said material in powder form and a catalytic material in powder form such that a porous pellet is formed having a region with a catalytic material and a region not having a catalytic material.
11. An electrical sensor device substantially as hereinbefore described with reference to Fig. 1 of the drawings.
12. An electrical sensor device substantially as hereinbefore described with reference to any one of Examples 1, 2, 3, 4, 5, 6, 7, or 8.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB848428934A GB8428934D0 (en) | 1984-11-15 | 1984-11-15 | Sensors |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8528233D0 GB8528233D0 (en) | 1985-12-18 |
| GB2167192A true GB2167192A (en) | 1986-05-21 |
| GB2167192B GB2167192B (en) | 1989-07-19 |
Family
ID=10569803
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB848428934A Pending GB8428934D0 (en) | 1984-11-15 | 1984-11-15 | Sensors |
| GB8528233A Expired GB2167192B (en) | 1984-11-15 | 1985-11-15 | Sensor device suitable for gases |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB848428934A Pending GB8428934D0 (en) | 1984-11-15 | 1984-11-15 | Sensors |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB8428934D0 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3610363A1 (en) * | 1986-03-27 | 1987-10-01 | Kernforschungsz Karlsruhe | METHOD FOR CONTINUOUSLY MONITORING CONCENTRATIONS OF GASEOUS INGREDIENTS IN GAS MIXTURES, EXCEPT O (ARROW DOWN) 2 (ARROW DOWN) |
| GB2198845A (en) * | 1986-07-17 | 1988-06-22 | Atomic Energy Authority Uk | Sensing |
| WO1989012819A1 (en) * | 1988-06-13 | 1989-12-28 | Ohmicron Corporation | Pyroelectric thermometric device |
| US5360266A (en) * | 1992-07-03 | 1994-11-01 | Robert Bosch Gmbh | Control and analysis circuit device for measuring reaction heat |
| EP0751603A1 (en) * | 1995-06-27 | 1997-01-02 | KUNDO SYSTEMTECHNIK GmbH | Power supply device, in particular for electrically operated measuring instruments |
| EP1293769A2 (en) * | 2001-09-07 | 2003-03-19 | National Institute of Advanced Industrial Science and Technology | Flammable gas sensor and gas concentration measurement method and apparatus |
| DE102008045856A1 (en) | 2008-09-05 | 2010-06-02 | Justus-Liebig-Universität Giessen | Sensor for measuring concentration of gases like hydrogen, oxygen, nitrogen oxide, chlorine or other reactive gases, comprises medium for measuring thermoelectric voltage and another medium for measuring ionic conduction of gases ions |
| CN108459046A (en) * | 2018-05-09 | 2018-08-28 | 哈尔滨工业大学 | The test device of film-type thermoelectric material Seebeck coefficient and conductivity |
| CN110988062A (en) * | 2019-11-25 | 2020-04-10 | 郑州炜盛电子科技有限公司 | Preparation method of gas diffusion electrode for measuring hydrogen sulfide gas |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111398365B (en) * | 2020-04-30 | 2023-08-25 | 中国人民解放军陆军防化学院 | Molybdenum disulfide-based ammonia gas sensor and preparation method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB249088A (en) * | 1925-03-12 | 1927-05-12 | Sidney Hershberg Katz | Improved apparatus for quantitative determination of gases |
| GB815047A (en) * | 1957-09-10 | 1959-06-17 | Max Planck Inst Eisenforschung | Improvements relating to thermocouples |
| GB924989A (en) * | 1961-12-29 | 1963-05-01 | Erie Resistor Ltd | Thermoelectric ceramic |
| GB955019A (en) * | 1961-03-24 | 1964-04-08 | Westinghouse Electric Corp | Thermoelectric materials and devices prepared therefrom |
| GB1023561A (en) * | 1961-02-24 | 1966-03-23 | English Electric Co Ltd | Gas detecting apparatus |
| GB1391514A (en) * | 1971-06-22 | 1975-04-23 | Renault | Quantitative detection system adapted to detect a component of a motor exhaust gas |
| GB2006440A (en) * | 1977-10-25 | 1979-05-02 | Obiaya J O | Oxygen concentration analyzer |
-
1984
- 1984-11-15 GB GB848428934A patent/GB8428934D0/en active Pending
-
1985
- 1985-11-15 GB GB8528233A patent/GB2167192B/en not_active Expired
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB249088A (en) * | 1925-03-12 | 1927-05-12 | Sidney Hershberg Katz | Improved apparatus for quantitative determination of gases |
| GB815047A (en) * | 1957-09-10 | 1959-06-17 | Max Planck Inst Eisenforschung | Improvements relating to thermocouples |
| GB1023561A (en) * | 1961-02-24 | 1966-03-23 | English Electric Co Ltd | Gas detecting apparatus |
| GB955019A (en) * | 1961-03-24 | 1964-04-08 | Westinghouse Electric Corp | Thermoelectric materials and devices prepared therefrom |
| GB924989A (en) * | 1961-12-29 | 1963-05-01 | Erie Resistor Ltd | Thermoelectric ceramic |
| GB1391514A (en) * | 1971-06-22 | 1975-04-23 | Renault | Quantitative detection system adapted to detect a component of a motor exhaust gas |
| GB2006440A (en) * | 1977-10-25 | 1979-05-02 | Obiaya J O | Oxygen concentration analyzer |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3610363A1 (en) * | 1986-03-27 | 1987-10-01 | Kernforschungsz Karlsruhe | METHOD FOR CONTINUOUSLY MONITORING CONCENTRATIONS OF GASEOUS INGREDIENTS IN GAS MIXTURES, EXCEPT O (ARROW DOWN) 2 (ARROW DOWN) |
| GB2198845A (en) * | 1986-07-17 | 1988-06-22 | Atomic Energy Authority Uk | Sensing |
| WO1989012819A1 (en) * | 1988-06-13 | 1989-12-28 | Ohmicron Corporation | Pyroelectric thermometric device |
| US5360266A (en) * | 1992-07-03 | 1994-11-01 | Robert Bosch Gmbh | Control and analysis circuit device for measuring reaction heat |
| EP0751603A1 (en) * | 1995-06-27 | 1997-01-02 | KUNDO SYSTEMTECHNIK GmbH | Power supply device, in particular for electrically operated measuring instruments |
| EP1293769A2 (en) * | 2001-09-07 | 2003-03-19 | National Institute of Advanced Industrial Science and Technology | Flammable gas sensor and gas concentration measurement method and apparatus |
| EP1293769A3 (en) * | 2001-09-07 | 2004-11-03 | National Institute of Advanced Industrial Science and Technology | Flammable gas sensor and gas concentration measurement method and apparatus |
| DE102008045856A1 (en) | 2008-09-05 | 2010-06-02 | Justus-Liebig-Universität Giessen | Sensor for measuring concentration of gases like hydrogen, oxygen, nitrogen oxide, chlorine or other reactive gases, comprises medium for measuring thermoelectric voltage and another medium for measuring ionic conduction of gases ions |
| CN108459046A (en) * | 2018-05-09 | 2018-08-28 | 哈尔滨工业大学 | The test device of film-type thermoelectric material Seebeck coefficient and conductivity |
| CN110988062A (en) * | 2019-11-25 | 2020-04-10 | 郑州炜盛电子科技有限公司 | Preparation method of gas diffusion electrode for measuring hydrogen sulfide gas |
| CN110988062B (en) * | 2019-11-25 | 2022-07-26 | 郑州炜盛电子科技有限公司 | Preparation method of gas diffusion electrode for measuring hydrogen sulfide gas |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8528233D0 (en) | 1985-12-18 |
| GB8428934D0 (en) | 1984-12-27 |
| GB2167192B (en) | 1989-07-19 |
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| PCNP | Patent ceased through non-payment of renewal fee |