Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1993-12-17
1995-08-29
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340562, 340596, 340618, 340620, 200 60, 324 725, 324658, 324664, 3241581, 73304C, G08B 2900, G01R 3102
Patent
active
054464447
ABSTRACT:
A test circuit for testing operation of a liquid level detector. The liquid level detector includes a probe that is placed at a test site. A control circuit monitors changes in capacitance of the probe due to changes in the liquid level at the test site. A test switch grounds an input to the probe which and causes the control circuit to sense an alarm condition. If the detector does not activate an alarm when the test switch is actuated, the detector is not properly functioning and repair or replacement of the level detector is needed.
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Crosland Donnie L.
Robertshaw Controls Company
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