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Fire detector drift compensation

  • US 10,204,508 B2
  • Filed: 04/29/2016
  • Issued: 02/12/2019
  • Est. Priority Date: 05/01/2015
  • Status: Active Grant
First Claim
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1. A fire detector system comprising:

  • a fire detector unit;

    a sensor disposed in the fire detector unit and arranged to detect characteristics of a fire and to generate an output signal indicative of the characteristics detected by the sensor; and

    a processor arranged to receive the output signal from the sensor and to generate a fire alarm signal when the output signal exceeds an alarm point threshold;

    wherein the system is arranged to change the alarm point threshold over time to compensate for drift in the response of the detector unit to the characteristics of a fire;

    wherein the fire detector unit includes a first sensitivity mode with a first drift compensation limit and a second sensitivity mode with a second drift compensation limit, the second sensitivity mode being more sensitive than the first sensitivity mode; and

    wherein, as the alarm point threshold in the first sensitivity mode approaches or reaches the first drift compensation limit, the system is changed from the first sensitivity mode to the second sensitivity mode.

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