Method of compensating a thermistor

Details Method of compensating a thermistor Method of compensating a thermistor

1982-03-15

1983-11-22

Goldstein, Herbert

Measuring and testing

Liquid level or depth gauge

Thermal type

137392, 364509, 364571, G01F 2322

Patent

active

044161530

ABSTRACT:
A computer-aided monitoring system and associated technique is disclosed for automatically controlling the liquid level of a heated tank subjected to changing temperatures. A first voltage signal from a thermistor sensor mounted within the tank at a predetermined level is digitally converted to multi-bit data indicative of fluid level. A second voltage signal produced by a separate thermistor sensor attached to the tank is digitally encoded as an indication of tank temperature and used to address a look-up table of voltage threshold values stored in a read-only memory. Empirically determined to vary linearly as a function of tank temperature, the voltage threshold values addressed are compared with the digital level data to determine if the liquid flow to the tank should be discontinued via a central processing unit.

REFERENCES:
patent: 4319233 (1982-03-01), Matsuoka et al.
patent: 4361037 (1982-11-01), Hauschild et al.

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