Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1983-04-01
1986-01-28
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
73 23, 422 98, G08B 1710
Patent
active
045674752
ABSTRACT:
A sensor element responding to gases and/or vapors is heated in at least two temperature cycles continuously from a starting temperature value to an upper temperature value in accordance with a predetermined pattern which is optimized for selective gases. The temperature is lowered to the starting temperature value in accordance with the same or a different pattern. During the temperature cycles a signal which depends on the composition of the gas or vapor atmosphere delivered by the sensor element is compared in an electronic evaluation circuit to stored values which are characteristic for the presence of selective components in the gas and/or vapor.
REFERENCES:
patent: 2583930 (1952-01-01), Cotton
patent: 3906473 (1975-09-01), Levine
patent: 3932807 (1976-01-01), Wilson
patent: 4088986 (1978-05-01), Boucher
patent: 4160163 (1979-07-01), Nakauchi
patent: 4399684 (1983-08-01), Advani et al.
The Radio and Electronic Engineer, vol. 44, No. 2, Feb. 1974; "Applications of the Tauguchi Gas Sensor to Alarms for Inflammable Gases" by Watson et al., pp. 85-91.
Bukowiecki Stanislaw
Pfister Gustav
Reis Alfons
Troup Alan P.
Ulli Hans-Peter
Cerberus AG
Kleeman Werner W.
Myer Daniel
Rowland James L.
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