Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1983-10-06
1985-10-22
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340509, 340511, 340518, G08B 2500, G08B 2900
Patent
active
045491682
ABSTRACT:
A device for monitoring the condition of a plurality of remote stations is particularly suited for monitoring the condition of smoke alarms, television antitheft devices and the like in hotels and similar institutions. The device includes a plurality of remote sensors wherein each sensor has a predetermined electrical characteristic, such as a predetermined electrical resistance, and at least one remote sensor is associated with each remote station. A main control unit sequentially measures the electrical characteristic of each of the sensors and then compares the measured electrical characteristic from the sensors with a predetermined value. In the event that the measured value differs from the predetermined value by more than a preset amount, an indicator is activated which advises an operator which sensor, and thus which remote station, has been activated or tampered with thus requiring investigation.
REFERENCES:
patent: 3665399 (1972-05-01), Zehr et al.
patent: 3988730 (1976-10-01), Valker
patent: 4001785 (1977-01-01), Miyazaki et al.
patent: 4222041 (1980-09-01), Von Tomkewitsch et al.
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