Catalytic detecting apparatus for detecting combustible gases and vapors
US4020480A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1975 |
| Grant date | Apr 26, 1977 |
| Priority date | — |
| Expiry date | Apr 21, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/16576
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus for detecting combustible gases and vapors, and comprises catalytic sensors selectively sensitive to the presence in a given environment of a potentially dangerous constituent such as a hydrocarbon gas and arranged to produce a signal representative of the presence of the constituent, a normally deactivated transducer responsive on activation to the output of the sensors and effective to produce an output signal indicative of the presence of the constituent in a concentration above a predetermined level, a pulse generating circuit arranged automatically and periodically to activate the sensors for a selected relatively short interval during which detection but not poisoning can occur and subsequently to deactivate the sensors for a relatively long period, fault detecting circuits for producing a fault signal in the event of circuit failure or impending power failure, and alarm circuitry for providing a differentiated warning in response to the fault signal and in response to the output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.