Supervisory circuit for parallel connected devices

Details Supervisory circuit for parallel connected devices Supervisory circuit for parallel connected devices

G - Physics

08

B

340/73

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

Patent

CA 1043438

SUPERVISORY CIRCUIT FOR PARALLEL CONNECTED DEVICES ABSTRACT OF THE DISCLOSURE A supervisory circuit for a plurality of continu- ously-conductive alarm devices connected in parallel between a pair of conductors monitors the operability of the circuit as well as the operability of each of the devices. Alarm devices having a low impedance are connected between the conductors over a parallel-connected resistor and diode which unidirectionally increases the impedance of such devices. The alarm circuit is connected in one arm of a balanced bridge circuit which has a detecting circuit connected in a further branch of the bridge circuit for monitoring the impedance of the circuit and for providing a supervision signal in response to a change in the impedance of the alarm circuit indicating inoperability of a device or open or short circuit conditions for the conductors which connect the devices into the circuit.

221019

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