Sensor circuit responsive to different fluid conductivities

Details Sensor circuit responsive to different fluid conductivities Sensor circuit responsive to different fluid conductivities

1986-10-20

1988-08-09

Paschall, M. H.

Electricity: measuring and testing

Electrolyte properties

Using a conductivity determining device

361251, 340620, G01N 2702

Patent

active

047630779

ABSTRACT:
A circuit for operating a load in response to predetermined external conductivity conditions including a pair of sensing electrodes, a source of electrical energy connected to one of the electrodes, a load, an operating circuit connected to the load, to the source and to the other of the sensing electrodes and including a first portion for storing electrical energy for operating the load and a second portion utilizing the stored energy to operate the load, and a control for allowing operation of only the first circuit portion when the sensing electrodes are exposed to a first medium having a predetermined electrical conductivity and then allowing operation of the second portion thereafter and when the sensing electrodes are exposed to a second medium having a different electrical conductivity. The control and its connection in the circuit are determined so as to be responsive to the first medium being of higher electrical conductivity than the second medium, for example water being the first medium and air the second. The load can be an electro-explosive device of an automatic release mechanism for an aviator helmet.

REFERENCES:
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patent: 4382231 (1983-05-01), Miller
patent: 4389889 (1983-06-01), Larson
patent: 4513248 (1985-04-01), Miller
patent: 4589172 (1986-05-01), Hoenigs et al.

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