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Composite detector

  • US 4,725,820 A
  • Filed: 07/03/1986
  • Issued: 02/16/1988
  • Est. Priority Date: 07/22/1985
  • Status: Expired due to Term
First Claim
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1. A composite detector system, comprising:

  • a plurality of sensor means for detecting physical phenomena defined by at least one of the parameters heat, smoke, and gas according to different principles of detection, and for outputting analog detection signals;

    a plurality of normally closed analog switches connected to outputs of said plurality of sensor means;

    selector means for opening one or more of the analog switches and operated with a control signal from a monitor circuit means for determining a system situation for which the selector means is to be operated; and

    operation circuit means for deriving a composite output based upon a combination of all of said analog detection signals fed through said plurality of normally closed analog switches.

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