Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture
Patent
1978-12-26
1980-05-13
Goldberg, Gerald
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Content or effect of a constituent of a liquid mixture
G01N 2718
Patent
active
042022037
ABSTRACT:
An alien liquid detector employs a monitoring element and an oscillatory electronic circuit for maintaining the temperature of the monitoring element substantially above ambient temperature. The output wave form, e.g., frequency of oscillation or wave shape, of the oscillatory circuit depends upon the temperature-dependent electrical characteristic of the monitoring element. A predetermined change in the output waveform allows water to be discriminated from another liquid, e.g., oil. Features of the invention employing two thermistors in two oscillatory circuits include positioning one thermistor for contact with water and the other thermistor above the oil-water interface to detect a layer of oil if present. Unique oscillatory circuit arrangements are shown that achieve effective thermistor action with an economy of parts and energizing power. These include an operational amplifier employed in an astable multivibrator circuit, a discrete transistor-powered tank circuit, and use of an integrated circuit chip.
REFERENCES:
patent: 3181557 (1965-05-01), Lannan, Jr.
patent: 3548637 (1970-12-01), Wicks
patent: 3906391 (1975-09-01), Murdock
Goldberg Gerald
Roskos Joseph W.
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