Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1980-10-16
1983-06-07
Brigance, Gerald L.
Communications: electrical
Condition responsive indicating system
Specific condition
340628, 436806, 324 61R, G08B 1710
Patent
active
043873693
ABSTRACT:
An air pollutant and/or fire combustion sensing apparatus includes a capacitive sensor having spaced sensing electrodes producing a free space mounted within an environment subject to possible fire or the like. One of the sensing electrodes has an outer dielectric layer for absorbing contaminating gaseous products. The electrodes are connected to a high voltage power source for producing a charged capacitor with a high intensity static electric field of substantially 5.times.10.sup.5 V/M up to the dielectric breakdown of air in the free space or gap. The electric field reacts upon the contaminating gaseous products of combustion and environmental pollution and produces an opposing electric field with a net change in the electric field and the summated voltage appearing across the electrodes. A high input impedance detecting circuit with good electrometer characteristics responds to the change in the field.
REFERENCES:
patent: 3221248 (1965-11-01), Batteau et al.
patent: 3728615 (1973-04-01), Hill et al.
patent: 4247299 (1981-01-01), Klein et al.
patent: 4264331 (1981-04-01), Klein et al.
Aukofer John E.
Klein Carl F.
Brigance Gerald L.
Johnson Controls Inc.
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