Circuit arrangement for the electrothermal measurement of level

Details Circuit arrangement for the electrothermal measurement of level Circuit arrangement for the electrothermal measurement of level

1984-10-10

1986-10-28

Frankfort, Charles

Measuring and testing

Liquid level or depth gauge

Thermal type

73304R, 340622, 374172, G01F 2324

Patent

active

046191402

ABSTRACT:
In a circuit arrangement for the electrothermal measurement of level with a resistance sensor (1) which can be fed by a source of constant current (3), a flow-of-operation control (12) for timed operation of the circuit arrangement in scanning periods is provided. By the flow-of-operation control the resistance sensor is heated periodically, namely only during a heating time (t.sub.0 to t.sub.1) at the start of a scanning period. By the flow-of-operation control the compensation voltage is, in this connection, detected by the resistance sensor and provisionally stored. At the end of the heating time another detection is effected, this time of the measurement voltage. By dividing the measurement voltage by the compensation voltage a value which is analogous to the level of a fluid surrounding the resistance sensor is formed. This value contains practically no disturbing variables.

REFERENCES:
patent: 4163391 (1979-08-01), Bezard et al.
patent: 4319233 (1982-03-01), Matsuoka et al.
patent: 4361037 (1982-11-01), Hauschild et al.
patent: 4425795 (1984-01-01), Albrecht et al.
patent: 4449404 (1984-05-01), Bohme et al.
patent: 4513616 (1985-04-01), Bezard et al.
patent: 4525850 (1985-06-01), Miller
patent: 4558456 (1985-10-01), Bezard et al.

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