Self-heating thermistor probe for low temperature applications

Details Self-heating thermistor probe for low temperature applications Self-heating thermistor probe for low temperature applications

1979-09-04

1981-06-30

Albritton, C. L.

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

338 25, 338 28, H01C 713, H01C 702, H01C 704

Patent

active

042765366

ABSTRACT:
A liquid level sensing probe includes a glass or ceramic thermally conductive housing which is molded around a positive temperature coefficient thermistor and a negative temperature coefficient thermistor. The two thermistors are connected in parallel. The thermistor network thus formed is connected to a suitable measurement apparatus by leads which extend outside of the housing. The probe and the measurement apparatus detect and distinguish between a liquid environment as opposed to a gaseous one even at low temperatures and even after the power source has been shut off and subsequently switched on again.

REFERENCES:
patent: 2685015 (1954-07-01), Weiller
patent: 3005171 (1961-10-01), Beckman
patent: 3025706 (1962-03-01), Oppenheim
patent: 3299296 (1967-01-01), Bullene
patent: 3340527 (1967-09-01), Rowell
patent: 3363466 (1968-01-01), Guidi
patent: 3365618 (1968-01-01), Obenhaus
patent: 3461446 (1969-08-01), Sergeant
patent: 3500058 (1970-03-01), Hirsbrunner
patent: 3559883 (1971-02-01), Buiting et al.

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