Fire gas detector-coding
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United States of America Patent
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Jun 12, 2012
Grant Date -
Feb 4, 2010
app pub date -
Sep 28, 2009
filing date -
Apr 30, 2004
priority date (Note) -
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Abstract
A detector comprises a detector base and a sensor, first and second resistors connected in series, a DC voltage source (Vref) connected to the resistors, and means for monitoring the voltage at the midpoint of a potential divider constituted by the series-connected resistors. The first and second resistors are rated so that the midpoint voltage is indicative of the date of manufacture of the sensor.
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