GB1276820A - Analyser - Google Patents
AnalyserInfo
- Publication number
- GB1276820A GB1276820A GB778371A GB778371A GB1276820A GB 1276820 A GB1276820 A GB 1276820A GB 778371 A GB778371 A GB 778371A GB 778371 A GB778371 A GB 778371A GB 1276820 A GB1276820 A GB 1276820A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bridge
- vibrator
- voltage
- circuit
- concentration
- 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.)
- Expired
Links
- 239000007789 gas Substances 0.000 abstract 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 3
- 238000004804 winding Methods 0.000 abstract 3
- 239000003054 catalyst Substances 0.000 abstract 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 abstract 2
- 239000000463 material Substances 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 229910052697 platinum Inorganic materials 0.000 abstract 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
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 By The Use Of Electric Means (AREA)
Abstract
1276820 Analysing gases electrically INSTITUT TEKHNICHESKOI TEPLOFIZIKI AKADEMII NAUK UKRAINSKOI SSR 25 March 1971 7783/71 Heading G1N [Also in Divisions G4 and H2] Apparatus for measuring the concentration of an oxidizable gas in a gas mixture comprises a catalyst detector element 19, 21, Fig.2, in a bridge circuit 3 fed with D.C. through a bi-stable multi-vibrator 2 and associated with an alarm circuit 8, whereby at a critical gas concentration the multi-vibrator is caused to periodically disconnect the bridge circuit from the D.C. supply 1 and activates the alarm circuit. As applied to measuring methane concentration, the bridge circuit 3 comprises two platinum heaters 21, 22, the latter surrounded by a passive cylinder of aluminium oxide 20 and the former surrounded by a similar cylinder 19 but carrying platinumpalladium catalyst material. The bridge 3 is completed by resistors 23, 24, 25. The normal D.C. voltage from source 1 causes transistor 31 to conduct, followed by transistors 12, 13, whereby the D.C. voltage is fed via transistor 12 to the bridge network 3, whose output is indicated on a meter 4 and is also fed to the control winding 46 on a magnetic amplifier 7. The latter is energized by A.C. from inverter 5 through main windings 41, 42 and its output from winding 45 is rectified at 47 and developed across resistor 16. At a predetermined output from bridge 3 the voltage across resistor 16 blocks multi-vibrator 2 to de-energize bridge 3 and magnetic amplifier 7 until multi-vibrator 2 automatically reverts, the time interval being universely proportional to the gas concentration. During this interval transistor 52 allows A.C. from inverter 5 to energize alarms 57, 59, which continue to operate intermittently with high methane concentration. An electronic relay circuit 6 senses the level of the D.C. voltage 1. If this falls below a value determined by Zener diodes 39, 40, transistors 31, 32 are blocked, followed by multi-vibrator 2 and alarms 57, 59 are continuously energized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB778371A GB1276820A (en) | 1971-03-25 | 1971-03-25 | Analyser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB778371A GB1276820A (en) | 1971-03-25 | 1971-03-25 | Analyser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1276820A true GB1276820A (en) | 1972-06-07 |
Family
ID=9839635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB778371A Expired GB1276820A (en) | 1971-03-25 | 1971-03-25 | Analyser |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1276820A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2121187A (en) * | 1982-05-26 | 1983-12-14 | Bosch Gmbh Robert | Liquid level monitoring means |
-
1971
- 1971-03-25 GB GB778371A patent/GB1276820A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2121187A (en) * | 1982-05-26 | 1983-12-14 | Bosch Gmbh Robert | Liquid level monitoring means |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |