Liquid level sensing system

Details Liquid level sensing system Liquid level sensing system

1988-12-08

1990-02-27

Yasich, Daniel M.

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

73308, 73313, 338 28, 340620, G01F 2324

Patent

active

049035304

ABSTRACT:
Multiple contact sensors located at axially spaced measurement zones, inside or outside of an elongated probe, closes a variable resistance circuit through the conducting substance being monitored, with monitoring means being a three-way or multicolored light emitting diode, which in connection with an AC power source and a transistor, changes color and luminosity as the substance being monitored reaches the various levels of the contact sensors.

REFERENCES:
patent: 3873979 (1975-03-01), Craford et al.
patent: 4090355 (1978-05-01), Morohoshi
patent: 4316174 (1982-02-01), Sutton et al.
patent: 4744640 (1988-05-01), Phillips
"Multi-Color LEDs", Electronic Service Instrument, Herrick, Prentice Hall, 1974, (340/620), pp. 42-43.

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