Title: Margin test switch for photoelectric intruder detection devices

Abstract: A switch incorporated in a photoelectric intruder detection system provides a simple means for testing the system for a predetermined margin of safety from false alarm producing sources. Upon actuation of the switch, the sensitivity of the system is reduced by a predetermined factor, such factor representing a predesired margin of safety from false alarms. During installation of the system, the switch is actuated to reduce system sensitivity. Upon positioning the system components to provide a desired catch capability, the switch is deactuated, thereby increasing the system sensitivity to a level which provides a margin of safety equal to or greater than the amount of gain reduction effected by the switch.

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Inventors: Lederer, David B. (Rochester, NY, US)

Application Number: 558296
Filing Date: 1975-03-14
Publication_date: 1976-08-10
Assignee: Detection Systems, Inc. (Fairport, NY)
Primary Class(es): 340/555
Other Classes:
US Patent Ref:

3838408

Sep, 1974

McMaster

340/214.

Other Refs:
Primary Examiner: Habecker, Thomas B.
Assistant Examiner:
Attorney: Kurz; Warren W.