Gas detector

Details Gas detector Gas detector

1981-09-14

1984-07-03

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

422 98, G08B 1710

Patent

active

044582420

ABSTRACT:
A gas detector comprising a main gas sensing element showing the resistance change to both the detection target gases, such as methane, butane, hydrogen gases, and non-target gases such as alcohol steam, smoke; an auxiliary gas sensing element showing the resistance change primarily to non-target gases along; the first comparator to which the output based on the resistance change of main gas sensing element is received as input in parallel form; the second comparator with lower reference electric power than that of the first comparator; a gate circuit to cut off the alarm actuating signal from the second comparator by means of output induced by the resistance change of auxiliary gas sensing element. Either the output from said gate circuit or the output from said first comparator is used for alarm actuating signal of alarm circuit.

REFERENCES:
patent: 4045178 (1977-08-01), Okinaka et al.
patent: 4185491 (1980-01-01), Owen
patent: 4256985 (1981-03-01), Goodson et al.

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