Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1981-12-14
1984-10-30
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
73 27R, 422 96, G08B 1710
Patent
active
044802528
ABSTRACT:
A pellistor type combustible gas detector including a Wheatstone bridge therefor fed from a voltage regulator and a constant current generator. Two comparators detect, for example, 50% to 75% of the lower explosive limit of the gas to be detected and 25% thereof, respectively. Latches keep indicator lamps lit and alarms turned on. The latches are selectively inhibited or not to check front panel and remote milliammeters calibrated in percent of gas concentration, and to test alarms. A gauged switch performs these and operating and reset functions. A circuit failure detector, lamp and alarm are also provided.
REFERENCES:
patent: 3801972 (1974-04-01), Ho Kim et al.
patent: 4020480 (1977-04-01), Gotley et al.
patent: 4219806 (1980-08-01), Enemark
International Telephone and Telegraph Corporation
Kristofferson T. E.
Myer Daniel
Rowland James L.
Stolzy A. D.
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