Alarm detector responsive to rate of change of a monitored condi

Details Alarm detector responsive to rate of change of a monitored condi Alarm detector responsive to rate of change of a monitored condi

1975-01-02

1977-12-27

Swann, III, Glen R.

Communications: electrical

Systems

Call station

73362SC, 324 71SN, 340207R, 340228R, G08B 1706

Patent

active

040657582

ABSTRACT:
A physical quantity such as temperature, infrared radiation or smoke is detected by means of a conversion device for emitting an alarm signal whose amplitude is representative of the intensity of the physical quantity. The detector comprises a unit for measuring relative variations of the signal in time, for comparing them with a preset threshold level and for actuating the alarm when they exceed the threshold level.

REFERENCES:
patent: 2827624 (1958-03-01), Klein
patent: 3117229 (1964-01-01), Friedland
patent: 3387296 (1968-06-01), Epstein et al.
patent: 3440883 (1969-04-01), Lightner
patent: 3594751 (1971-07-01), Ogden et al.

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