Dual alarm detection on single loop

Details Dual alarm detection on single loop Dual alarm detection on single loop

G - Physics

08

B

340/73

G08B 29/00 (2006.01) G08B 19/00 (2006.01) G08B 23/00 (2006.01)

Patent

CA 1137580

DUAL ALARM DETECTION ON SINGLE LOOP Abstract A circuit for distinguishing between two classes of alarms on a single loop. An alarm of a first class causes an impedance of a first predetermined value to be added in the loop; and an alarm of a second class causes a much larger additional impedance, or an open condition, to be inserted in the loop. The loop is bridged across an element of a voltage divider and, therefore, the loop characteristics, including the changed characteristics due to the impedance change in re- sponse to an alarm of either class, controls the potential of a test point of the voltage divider. Voltage comparators moni- tor the potential of the test point relative to control poten- tials, and cause relays to provide a no alarm signal, a first alarm signal, or a second alarm signal when there is no alarm condition on the loop, an alarm of the first class, or an alarm of the second class, respectively, on the loop.

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