Gas detector

Details Gas detector Gas detector

1981-09-14

1984-12-25

Brigance, Gerald L.

Communications: electrical

Condition responsive indicating system

Specific condition

340632, 73 27R, 338 34, G08B 1710

Patent

active

044907150

ABSTRACT:
A gas detector for detecting the leak of fuel gases, such as hydrogen gas, methane gas, butane gas, with improved reliability in detecting the gas leak. Said gas detector includes a main gas sensing element showing the change in resistance to target gases, such as methane, butane, hydrogen, as well as to non-target gases, such as alcohol, steam, smoke; an auxiliary gas sensing element showing change in resistance rather to non-target gas than to target gas; the first comparator receiving the output induced by resistance change in main gas sensor, as input; the second comparator with reference voltage set at lower level than that for the first comparator; and a gate circuit for blocking the alarm driving signal of the second comparator by the output induced by resistance change in auxiliary gas sensor. The output obtained from either said gate circuit or the first comparator is used for alarm driving signal of alarm circuit.

REFERENCES:
patent: 4164862 (1979-08-01), Jackson
patent: 4219806 (1980-08-01), Enemark
patent: 4250829 (1981-02-01), Stephens, Jr.
patent: 4256985 (1981-03-01), Goodson et al.
patent: 4258563 (1981-03-01), Yasuda et al.
patent: 4345242 (1982-08-01), Ienna-Balistreri
patent: 4352087 (1982-09-01), Wittmaier

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