Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1981-11-02
1984-04-17
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
73 23, 422 96, G08B 1710
Patent
active
044437935
ABSTRACT:
Improvements in a gas detecting system utilizing a filament-heated gas sensor displaying measurable resistance characteristics which vary with the concentration of selected gases within the atmosphere in the vicinity of the sensor inhibit the production of gas detection indications automatically during the initial activation of the system while the sensor element is stabilizing and further inhibit the production of short staccato alarm indications produced by inherent small changes in the characteristics of the sensor brought about by thermal drift.
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patent: 4007456 (1977-02-01), Paige et al.
patent: 4112356 (1978-09-01), Toy
patent: 4177668 (1979-12-01), Holmberg
patent: 4345242 (1982-08-01), Ienna-Ballistreri
Caldwell Sr. John W.
Calnor of El Paso
Duffy James F.
Myer Daniel
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