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Solid state gas detection sensor diagnostic

  • US 9,709,544 B2
  • Filed: 02/13/2015
  • Issued: 07/18/2017
  • Est. Priority Date: 02/14/2014
  • Status: Active Grant
First Claim
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1. A metal oxide semiconductor-based toxic gas detector comprising:

  • a metal oxide semiconductor-based gas sensor, the gas sensor having an electrical characteristic that varies with a concentration of a toxic gas;

    measurement circuitry coupled to the metal oxide semiconductor-based gas sensor, the measurement circuitry being configured to measure the electrical characteristic and provide a digital indication of the measured electrical characteristic; and

    a controller coupled to the measurement circuitry and configured to provide a toxic gas output based on the digital indication, the controller being further configured to detect a fluctuation in measured digital indications of the measured electrical characteristic over a period of time, and, based on the detected fluctuation, provide a diagnostic indication relative to the metal oxide semiconductor-based sensor.

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