Measuring apparatus for measuring the alteration of a liquid qua

Details Measuring apparatus for measuring the alteration of a liquid qua Measuring apparatus for measuring the alteration of a liquid qua

1986-10-16

1988-10-18

Cuchlinski, Jr., William A.

Measuring and testing

Liquid level or depth gauge

73290R, 367908, G01F 2300

Patent

active

047778210

ABSTRACT:
A measuring apparatus for accurately measuring the alteration of a liquid quantity, especially the quantity of oil in an internal combustion engine, in a reservoir containing said liquid, especially the oil pan of the internal combustion engine, comprises a measuring chamber which is separate from the reservoir and communicated thereto via a liquid compensator conduit. The liquid compensator conduit and the measuring chamber are heated to a constant temperature by heater. A level sensor for measuring the propagation of a sonic signal is disposed within the measuring chamber above the liquid level. Any temperature variations in the measuring chamber above the liquid level are detected by a gas thermometer and are utilized in an evaluator unit for correcting the measured level signal. The temperature of the liquid, which is measured in the liquid compensator conduit either near the measuring chamber or in said chamber itself, is supplied to a control unit connected to the evaluator unit for acting on the heater to keep the temperature constant.

REFERENCES:
patent: 3241368 (1966-03-01), Newitt
patent: 3589196 (1971-06-01), Passaic et al.
patent: 3727029 (1973-04-01), Chrow
patent: 4161647 (1979-07-01), Carbonnel
patent: 4337656 (1982-07-01), Rapp
patent: 4531406 (1985-07-01), Fritz

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