Testing a fire detector sensor

Details Testing a fire detector sensor Testing a fire detector sensor

2005-04-29

2009-10-27

Nguyen, Phung (Department: 2612)

Communications: electrical

Condition responsive indicating system

With particular system function

Reexamination Certificate

active

07609154

ABSTRACT:
A method is disclosed for testing the functionality of a sensor (1) of a fire detector during operation thereof. The method comprises applying a current-limited test signal to the sensor (1), the test signal being such that the impedance of the sensor is such as to absorb the current-limited test signal when the sensor is operating normally; and applying the output of the sensor to a test signal detector (7). The arrangement is such that the test signal passes the output terminal of the sensor (1) only when the sensor is not operating normally.

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