Electrical controls for ionization smoke detector
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United States of America Patent
Stats
-
Aug 30, 1983
Grant Date -
N/A
app pub date -
Feb 11, 1981
filing date -
Feb 11, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An ionization smoke detector device including means for insuring that adjustment can be made in the triggering potential for the alarm device so that should circumstances change, an operator can make a simple adjustment to take into account the changed circumstances. This means comprises a programmable Zener diode which is connected to a voltage dividing resistance network at the output of a field effect transistor, the other end of the Zener diode being connected to the input of a silicon controlled rectifier device which functions to trigger the alarm. Another primary feature of the present invention is the provision of a means for testing the operation of the system in such a way that all of the elements of the system will be tested rather than merely some of them.
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