Synchronised timing device

Details Synchronised timing device Synchronised timing device

H - Electricity

05

B

H05B 37/02 (2006.01)

Patent

CA 2188977

A timing device which is associated with a light level sensor and which is arranged to provide a time-out signal to a relay after a predetermined time has elapsed following detection of a low light condition and initial energisation of the relay. The device provides for synchronisation of an initiation time T1 and, hence, a time-out signal generating time T2 with respect to a periodically occurring event time T3 (for example, sunset time) in order that the desired time of generating the time-out signal might be re-established following interruption of power to the device. Should loss of power occur, the last entered event time T3 is employed to synchronise the initiation time T1 and, hence, the signal generating time T2, when detection of a predetermined light level next occurs following re-establishment of power to the device.

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