Photoelectric type fire detector
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United States of America Patent
Stats
-
Nov 12, 1996
Issued Date -
N/A
app pub date -
Dec 13, 1995
filing date -
Mar 31, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A photoelectric type fire detector includes self-testing capabilities. An upper level threshold limit and a lower level threshold define a predetermined range for output levels of an amplifier connected to an output of a light receiving element. In a self-test mode, a gain set in the amplifier is increased automatically. The number of times in which the amplifier output level deviates from the predetermined range is counted. If the deviation count exceeds a predetermined count threshold, it is determined that the photoelectric type fire detector is abnormal.
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