Alarm system diagnostic apparatus

Details Alarm system diagnostic apparatus Alarm system diagnostic apparatus

G - Physics

08

B

340/77

G08B 29/00 (2006.01) G08B 29/14 (2006.01)

Patent

CA 1247714

ALARM SYSTEM DIAGNOSTIC APPARATUS ABSTRACT A diagnostic status indicating apparatus is used with an alarm system having a plurality of normally-closed switch contacts which are opened upon occurrence of an alarm condition. Light-emitting diodes are connected across the normally-closed switch contacts at an opposite polarity to that of the current normally passing through the contacts in the operating mode. In order to diagnose the alarm-generating condition of the electrical contacts, a switch removes the operating voltage and connects a test voltage at a reverse polarity, whereupon the LED for any open circuited electrical contact is activated. The device is preferably based upon a double-pole-double-throw switch and includes indicators for a test condition and for a ground fault.

488581

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