Communications: electrical – Systems – Call station
Patent
1976-11-01
1978-06-27
Caldwell, Sr., John W.
Communications: electrical
Systems
Call station
250381, 340237S, G08B 2900
Patent
active
040978508
ABSTRACT:
A detecting device having a sensor responsive to the presence of predetermined phenomena to generate a signal which changes from a nominal value by an amount in accordance with concentrations of the phenomena, and circuitry connected with the sensor to monitor the signal and adjustable to generate an indication upon the signal changing by at least a selected first amount, is characterized by means for operating the sensor to selectively change the signal in the absence of the phenomena by either the first amount or by a second predetermined and greater amount. Where the detector is a fire detector, the phenomena to be sensed is products of combustion, and the signal changes by the first amount upon the presence of products of combustion in the minimum concentrationswhereat it is desired to generate an indication, and by the second amount upon the presence of products of combustion in the maximum concentrations which may occur before generation of an indication is necessary. With the signal selectively changed by the first amount in the absence of combustion, the monitoring and generating circuitry may be adjusted to provide the indication, whereby the sensitivity of the detector to combustion is adjusted. With the sensitivity adjusted, the detector may then be tested by selectively changing the signal by the second amount to cause the detector to respond as though combustion has occurred.
REFERENCES:
patent: 3500368 (1970-03-01), Abe
patent: 3564524 (1971-02-01), Walthard et al.
Caldwell Sr. John W.
Myer Daniel
Pittway Corporation
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