Device for the measurement of liquid level

Details Device for the measurement of liquid level Device for the measurement of liquid level

1976-07-12

1977-11-08

Swisher, S. Clement

Geometrical instruments

Area integrators

Electrical

73295, G01G 2324

Patent

active

040568873

ABSTRACT:
A system for determining remotely the distance from the bottom of a storage tank to the liquid-vapor interface of the stored liquid utilizing a pair of solid state electrical sensing elements whose electrical resistance varies as a function of element heat dissipation capable of providing continuous extremely accurate digitally displayed measurement information referenced to the bottom of the tank even when the stored liquid and vapor are at the same temperature. The solid-state electrical interface sensing elements are affixed at the end of a vertically suspended motor driven cable disposed within the storage tank which is coupled to a DC pulse activated stepping motor and a master control circuit connecting the signal output of the sensing elements to the motor. The motor and cable system in conjunction with the control circuitry provide and drive the motor in stepping increments for continuously determining the liquid-vapor interface as referenced to the bottom of the storage tank. A remote digital display showing the quantitative values of the liquid-vapor interface level is provided. Scaling logic circuitry correlates the digital pulse counting technique in conjunction with a step-by-step movement of the probe assembly through the DC stepping motor.

REFERENCES:
patent: 3969941 (1976-07-01), Rapp

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