Thermistor detector circuit and discriminating network for heat

Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture

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Details

73188, 73204, G01N 2518, G01F 100, G01W 100

Patent

active

041596382

ABSTRACT:
Detecting conditions related to the heat absorptive characteristics of a surrounding medium by heated thermistors exposed for heat transfer to the medium, and connected to a restorative energizing electronic circuit that supplies heating power. The restorative circuit responds to differences between the resistance of the sensing leg containing the thermistors and a reference value to vary the power flow through the leg and thus to restore the resistance of the leg toward the reference value. With two or more thermistors in the leg, the thermistors are heated in unison by the single energizing circuit, each thermistor is disposed in a different relationship to the conditions to be discriminated and differences between the individual thermistor resistances, reflecting differing rates of heat loss to the medium provide indications of the various conditions. When one thermistor is used, the power flow through the overall leg can serve as a measure of conditions of the surrounding medium. Features of the invention employing two thermistors 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 and using the two thermistors as a fluid flow detector with temperature compensation. Unique circuit arrangements are shown that achieve effective thermistor action with an economy of parts and energizing power.

REFERENCES:
patent: 2437449 (1948-03-01), Ames, Jr. et al.
patent: 2650496 (1953-09-01), Middleton et al.
patent: 3429178 (1969-02-01), Durbin
patent: 3548637 (1970-12-01), Wicks
patent: 3852997 (1974-12-01), Horvath

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