Self-testing combustion products detector

Details Self-testing combustion products detector Self-testing combustion products detector

G - Physics

08

B

358/21

G08B 29/00 (2006.01) G08B 17/10 (2006.01)

Patent

CA 1248245

Abstract of the Disclosure A self test circuit for a combustion products de- tector automatically periodically tests whether the sen- sitivity of the sensor is in an predetermined range between minimum and maximum sensitivities. Transistor switches selectively connect different test impedances across the sensor for respectively simulating two amounts of combustion products, one of which is slight- ly less than the amount corresponding to the maximum sensitivity level and the other of which is slightly greater than the amount corresponding to the minimum sensitivity level. If the sensor either produces a smoke output signal in response to the first test or fails to produce an output signal in response to the second test, then the smoke alarm is actuated after the tests are completed to produce a unique fault signal, the alarm annunciator being inhibited during the test.

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