Apparatus for detecting water in oil

Details Apparatus for detecting water in oil Apparatus for detecting water in oil

1977-03-14

1978-09-12

Ruehl, Charles A.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Content or effect of a constituent of a liquid mixture

324 61R, G01N 2722

Patent

active

041127447

ABSTRACT:
In an apparatus for detecting water in oil a capacitive probe is filled with the oil under test. This probe and a reference capacitor are alternately connected in the frequency determining network of an h.f. oscillator, the output of which is connected to a frequency to voltage converter. A sample and hold circuit gated in synchronism with switching of the capacitors and an amplifier a.c. coupled to the sample and hold circuit provides an a.c. output, a change in the amplitude of which indicates changes in the dielectric constant of the oil.

REFERENCES:
patent: 2934700 (1960-04-01), Holaday et al.
patent: 3215931 (1965-11-01), Schooley, Jr.
patent: 3546926 (1970-12-01), Dunavent, Jr. et al.

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