Anticipatory flammable gas detection system

Details Anticipatory flammable gas detection system Anticipatory flammable gas detection system

1976-06-18

1978-02-14

Caldwell, Sr., John W.

Communications: electrical

Systems

Call station

340248A, G08B 1710

Patent

active

040742431

ABSTRACT:
An anticipatory flammable gas detection system is provided for quickly determining whether the rise rate of gas concentration will approach a potentially hazardous level. The system includes a detector for determining the rise rate of the gas concentration and a comparator for determining whether the rise rate exceeds a potentially hazardous level. An integrator or multivibrator is provided for determining how long the rise rate exceeds a predetermined value. If the rise rate exceeds the predetermined hazardous rate of rise for more than a predetermined period of time, an alarm signal is generated. Prevention of false alarms is accomplished by providing another comparator which determines whether the magnitude of gas concentration exceeds a preselected percentage of the lower flammable limit. Should the magnitude be less than the preselected percentage, the alarm signal will not be generated.

REFERENCES:
patent: 2827624 (1958-03-01), Klein
patent: 2871466 (1959-01-01), Vassil et al.
patent: 2901740 (1959-08-01), Cutsogeorge
patent: 3038106 (1962-06-01), Cutsogeorge et al.
patent: 3594557 (1971-07-01), Anderson
patent: 3748656 (1973-07-01), Gray et al.
patent: 3978462 (1976-08-01), Goodman

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