Electricity: measuring and testing – Electrolyte properties – Using a conductivity determining device
Patent
1983-02-01
1985-04-23
Tokar, Michael J.
Electricity: measuring and testing
Electrolyte properties
Using a conductivity determining device
244151B, 340620, 361251, G01N 2702
Patent
active
045132488
ABSTRACT:
Apparatus for sensing the electrical conductivity of fluid which can be used to detonate an electro explosive device for operating a release mechanism for uncoupling a parachute canopy from its load upon landing in water. An operating network connected to an ignition capacitor and to a conductivity sensing circuit and connected in controlling relation to a semiconductor switch has a voltage independent portion which controls the time at which the semiconductor switch is closed to define a discharge path to detonate the electro explosive device independent of the rate of voltage rise on the ignition capacitor. The operating network also has a voltage dependent portion which when a voltage of predetermined magnitude is developed on the conductivity sensing circuit in response to fluid not having the predetermined condition of conductivity, the voltage dependent portion closes the semiconductor switch to define the discharge path when the energy level is insufficient to detonate the electro explosive device. A regulated current source is connected in relation to the conductivity sensing circuit and to the electrodes thereof in a manner placing the circuit voltage across the electrodes when the conductivity of the fluid is below a predetermined magnitude so that the sensing circuit does not respond thereto and placing the circuit voltage across the sensing circuit when the conductivity of the fluid is greater than a predetermined magnitude. The apparatus is operated from a battery, and the electrodes are of dissimilar metals so selected and connected relative to the polarity portions of the circuit to maximize utilization of the battery output voltage.
REFERENCES:
patent: 3498131 (1970-03-01), Rickey
patent: 3910457 (1975-10-01), Sutliff et al.
patent: 4024440 (1977-05-01), Miller
patent: 4137527 (1979-01-01), Tennenhouse et al.
patent: 4227190 (1980-10-01), Kelley et al.
patent: 4253628 (1981-03-01), Marek
patent: 4382231 (1983-05-01), Miller
Conax Corporation
Tokar Michael J.
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