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Sensing apparatus and method

  • US 8,892,399 B2
  • Filed: 07/09/2012
  • Issued: 11/18/2014
  • Est. Priority Date: 05/14/2003
  • Status: Active Grant
First Claim
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1. A method of detecting one or more blocked sampling holes in a pipe of an aspirated smoke detector system, said aspirated smoke detector system comprising a sampling network including one or more pipes having sampling holes, an aspirator for drawing air through the sampling network to a detector;

  • and a flow sensor, said method comprising;

    ascertaining the base flow of fluid through a particle detector using the flow sensor;

    monitoring subsequent flow through the particle detector using the flow sensor; and

    comparing in a processor, the subsequent flow with the base flow, and determining that one or more sampling holes of the sampling network are blocked and indicating a fault, if the difference between the base flow and the subsequent flow exceeds a predetermined threshold.

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