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Detector

  • US 9,134,180 B2
  • Filed: 11/20/2007
  • Issued: 09/15/2015
  • Est. Priority Date: 02/06/2007
  • Status: Active Grant
First Claim
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1. A detector comprising:

  • a housing;

    a flame detector sensor mounted within the housing and configured to detect an external flame;

    a first temperature sensor configured to sense temperature of the flame detector sensor;

    a second temperature senor configured to sense ambient temperature;

    a heater positioned adjacent to the flame detector sensor; and

    a controller in communication with the first temperature sensor and the second temperature sensor, and configured to vary power supplied to the heater;

    wherein the controller is further configured to;

    compare the ambient temperature as indicated by the second temperature sensor to the temperature of the flame detector sensor as indicated by the first temperature sensor, wherein the ambient temperature is varying;

    in response to the comparison, determine an amount of power to the heater in order to control a rate of change of the temperature of the flame detector sensor to be within a predetermined limit;

    control the power supplied to the heater at the determined amount of power to change the temperature of the flame detector sensor at the rate of change to a different temperature so that the different temperature of the flame detector sensor is within a predetermined temperature difference relative to the varying in the ambient temperature.

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