Apparatus and method for detecting a liquid level in a sealed st

Details Apparatus and method for detecting a liquid level in a sealed st Apparatus and method for detecting a liquid level in a sealed st

1998-06-15

2000-04-18

Stinson, Frankie L.

Textiles: fluid treating apparatus

Machines

Single tub and automatic sequential operation mechanism

68 18R, 68 18C, 73291, D06F 3300

Patent

active

06050112&

ABSTRACT:
A dry-cleaning apparatus using liquid carbon dioxide (CO.sub.2) as the cleaning fluid has a liquid level detector for providing a continuous reading of the liquid CO.sub.2 level in a storage tank. The liquid level detector includes a first resistance temperature detector disposed in the gas above the liquid, a second resistance temperature detector immersed in the liquid, and a third resistance temperature detector with an elongated sensing section disposed in part in the gas above the liquid and in part in the liquid. Each of the three resistance temperature detectors are heated by a constant current. Voltage signals indicating the respective resistance values of the resistance temperature detectors are measured and processed by a controller to continuously determine and monitor the liquid level in the storage tank.

REFERENCES:
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patent: 5466946 (1995-11-01), Kleinschmitt et al.
patent: 5505219 (1996-04-01), Lansberry
patent: 5798698 (1998-08-01), Politt et al.
patent: 5850747 (1998-12-01), Roberts et al.
patent: 5858107 (1999-01-01), Chao et al.
patent: 5866797 (1999-02-01), Swanson

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