Measuring and testing – Liquid level or depth gauge – Thermal type
Patent
1994-07-08
1997-04-01
Cuchlinski, Jr., William A.
Measuring and testing
Liquid level or depth gauge
Thermal type
73292, 374 54, G01F 2300
Patent
active
056155735
ABSTRACT:
A level detector for detecting a level of a liquid is provided with an elongated probe having opposed proximal and distal ends. In use, the distal end of the elongated probe is submerged beneath the level of the liquid with an unwetted length of the elongated probe located above the level of the liquid. A thermal conductor or an electrical heater is provided for maintaining a temperature difference between the proximal end of the elongated probe and the liquid so that at an intermediate location of the elongated probe, located above the level of the liquid, the temperature will be dependent upon the unwetted length of the elongated probe. A thermocouple or the like can be provided for generating a signal referable to the temperature at the intermediate location and the level of the liquid can thereby be correlated with such signal.
REFERENCES:
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patent: 3566676 (1971-03-01), Hays
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patent: 4655079 (1987-04-01), Masumoto et al.
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patent: 5209115 (1993-05-01), Bond
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patent: 5393736 (1995-02-01), Hodge et al.
Cassett Larry R.
Cuchlinski Jr. William A.
Hirshfeld Andrew
Rosenblum David M.
The BOC Group Inc.
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