Monitoring arrangement for monitoring a change from a normal...

Details Monitoring arrangement for monitoring a change from a normal... Monitoring arrangement for monitoring a change from a normal...

H - Electricity

04

B

340/102

H04B 3/50 (2006.01) G08B 19/00 (2006.01)

Patent

CA 1096954

ABSTRACT OF THE DISCLOSURE A monitoring arrangement for monitoring a change from a normal condition of any one of a plurality of condition sensing devices. It includes a common two conductor circuit connecting the condition sensing devices. A central monitoring apparatus is connected to the common two conductor circuit and supplies current to the circuit. Each of the condition sensing devices includes a device for limiting the amount of current flowing therethrough from the common two conductor circuit; a mechanism to detect and to react to any change from a normal condition being sensed; and a mechanism to interrupt the current to at least all following condition sensing devices in the circuit upon reaction of the condition sensing device to a change in a condition being sensed. An apparatus is formed as part of the central monitoring apparatus for measuring and indicating a magnitude of current being supplied to the common two conductor circuit at any given time.

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