Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1978-03-27
1979-12-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
340630, 356438, G01N 2126
Patent
active
041807421
ABSTRACT:
A smoke detector system utilizing remote detectors of the photo-electric type connected to a central control panel. In one embodiment means is provided for monitoring both the signal lead and power lead, and in another embodiment, means is also provided for monitoring the condition of the detector light source. A normally illuminated compensating cell is provided in series with the smoke detection cell, with the bottom of the compensating cell being maintained a predetermined voltage above ground to provide a monitor voltage at the junction of the cells. The output signal lead is connected to the junction of the compensating cell and the smoke cell, and feeds a high impedence input amplifier, the output of which goes to the control panel. Means is provided at the panel for responding to the presence of an alarm signal on the signal lead or the absence of the monitor voltage which might be caused by a break in the signal lead, or the power lead. In the otherembodiment, means is provided for causing a loss of the monitor voltage on failure of the light source.
REFERENCES:
patent: 3879718 (1975-04-01), Roberts
patent: 4025915 (1977-05-01), Enemark
patent: 4053785 (1977-10-01), Lee et al.
Chloride Incorporated
Nelms David C.
Ross Robert E.
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