Liquid level detecting apparatus

Details Liquid level detecting apparatus Liquid level detecting apparatus

1990-08-31

1991-03-26

Cuchlinski, Jr., William A.

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

340620, 338 38, 338 80, G01F 2324

Patent

active

050019287

ABSTRACT:
A level detecting resistor (Rd) is inserted into a liquid (5) and has a length immersed in the liquid. The level detecting resistor (Rd) is supplied a constant current (Id) from a constant current source (1). The voltage drop (Vd) developed across the level detecting resistor (Rd) is supplied to a non-inverting input terminal of a differential input amplifier (OP1, R1-R4). The output (Vo) of the differential input amplifier is then divided by a series-circuit of a temperature compensating resistor (Rc) and a resistor (R5). The divided voltage (Va) across the resistor (R5) is fed back via a voltage follower (OP2) to the non-inverting input terminal of the differential input amplifier.

REFERENCES:
patent: 4641523 (1987-02-01), Andreasson

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