Electronic monitoring system with malfunction indicator

Details Electronic monitoring system with malfunction indicator Electronic monitoring system with malfunction indicator

1983-02-17

1985-06-25

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340514, 340561, G08B 2900

Patent

active

045256993

ABSTRACT:
A contactless motion detector, specifically an oscillator whose signal amplitude is attenuated or enhanced by the approach of a monitored metallic element, is periodically switched for brief periods into its alternate state by a train of short test pulses giving rise to corresponding checking pulses that are superimposed upon the integrated output voltage of the oscillator whereby that voltage is intermittently increased when at low level and/or intermittently reduced when at high level. These checking pulses, whether of the voltage-increasing or the voltage-reducing kind, are integrated to provide an enabling signal allowing a controlled load to be energized or de-energized according to the mean value of the output voltage; an absence of the enabling signal indicates a malfunction.

REFERENCES:
patent: 3566399 (1971-02-01), Weld
patent: 3934237 (1976-01-01), Gysell et al.
patent: 4070669 (1978-01-01), Gautier

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