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Threshold compensation and calibration in distributed environmental detection system for fire detection and suppression

  • US 4,977,527 A
  • Filed: 04/14/1988
  • Issued: 12/11/1990
  • Est. Priority Date: 04/14/1988
  • Status: Expired due to Fees
First Claim
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1. A system for detecting the environmental status of a monitored space comprising:

  • at least one environmental status detector in the monitored space including means for sensing an environmental condition parameter and for producing a detection signal representative thereof, said detection signal being subject to signal drift, said detector further including activatable simulation means for selectively creating a condition simulating an environmental condition parameter of predetermined magnitude and in response for producing a test signal representative thereof; and

    signal processing means operably coupled with said detector for sending signals thereto, for receiving and processing signals therefrom, and for determining the occurrence of a predetermined environmental condition in the monitored space as a function of said detection signal and selectively alterable threshold data, said signal processing means including memory means for selective storage of data, and including calibration means for automatically calibrating said system at a predetermined time, said calibration means including--means for prompting storage of data in said memory means representative of said detection signal at said predetermined time as calibration data, such being representative of the environmental status of the monitored space at said predetermined time,means for selectively activating said simulation means in order for said detector to produce said test signal in response,means for prompting storage of test data representative of said test signal, andmeans for determining said threshold data as a function of said calibration and test data and for prompting storage of said threshold data in said memory means for subsequent use in determining said environmental condition.

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