G - Physics – 01 – R
Patent
G - Physics
01
R
324/58.3
G01R 31/02 (2006.01) G08B 21/00 (2006.01) G08B 29/12 (2006.01)
Patent
CA 1328122
DEVICE FOR SENSING CONTINUITY IN A CIRCUIT HAVING AN OPEN CIRCUITED APPARATUS Abstract of the Disclosure The two wire device tests the continuity of conductors in a monitoring circuit having an open circuited apparatus. The device has a switch which is controlled by a sequencer and a clock. Upon the application of power, the device is energized if the continuity of the conductors is present. The clock provides a train of pulses that alternately opens and closes the switch. When the switch is closed, continuity across the conductors is provided to illuminate an indicator lamp. When the switch is open, a power storage unit charges from the monitoring circuit power supply. The power storage unit provides operating power to the sequencer and the clock. The output of the clock has a long duty cycle so that the time when the switch is open is very brief, thus causing the lamp to be perceived by a human as unaffected. The sequencer counts the number of oscillations produced by the clock and when a predetermined number has occurred, turns off the clock and leaves the switch open. In another aspect, the circuit has parallel branches with a device on each branch. The devices communicate with each other on the conductors to determine if continuity exists in each branch before illuminating the lamp.
614298
Berrier Gene C.
Landmann Wolf S.
Smart & Biggar
Vibro-Meter S.a.
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