Tamper-resistant supervisory system

Details Tamper-resistant supervisory system Tamper-resistant supervisory system

1985-09-19

1987-12-29

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340666, G08B 1314

Patent

active

047164018

ABSTRACT:
A supervisory system includes a plurality of remote sensing units for positioning under the weight of an item to be monitored. The sensor unit includes a resistor connected in parallel with a switch which is held open by the weight of the article, but which will close when the article is removed from the sensor unit. A cable connects each sensor unit to a monitoring circuit which includes a DC potential source, a square wave generator, an impedance network, a comparator circuit and an alarm signal generator. The comparator circuit activates the alarm signal in response to certain changes in the sensor unit or in the cable.

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