Electricity: measuring and testing – Electrolyte properties – Using a conductivity determining device
Patent
1990-02-02
1991-06-11
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Electrolyte properties
Using a conductivity determining device
324444, 340620, 361251, 102220, G01R 2702, F42C 1106
Patent
active
050235567
ABSTRACT:
A circuit for operating a load in response to predetermined external conductivity conditions comprising a pair of sensing electrodes, a source of electrical energy connected to one of the electrodes, a load connected to the other of the electrodes, a controlled switch connected to the load, a first energy storage branch having a timing chracteristic and connected between the source and the other electrode, a second energy storage branch having a timing characteristic and connected across the combination of the load and a controlled switch, and a control operatively connected to the first and second branches and connected in controlling relation to the controlled switch so that when the electrodes are exposed to a first medium having a predetermined electrical conductivity energy builds up on first and second branches and the controlled switch is open and then a predetermined time after the electrodes are exposed to a second medium having a different electrical conductivity the controlled switch is closed and the load is operated by energy stored in the second branch. The first and second energy storage branches have different timing characteristics, and the predetermined time is a function of that difference. 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:
patent: 4382231 (1983-05-01), Miller
patent: 4513248 (1985-04-01), Miller
patent: 4827844 (1989-05-01), Miller
Bean Jr. Edwin T.
Conax Florida Corporation
Eisenzopf Reinhard J.
Harvey Jack B.
Linihan Martin G.
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