Liquid level sensor

Details Liquid level sensor Liquid level sensor

2005-12-13

2005-12-13

Chapman, John E. (Department: 2856)

Measuring and testing

Liquid level or depth gauge

Thermal type

C073S30400R, C073S30400R, C073S313000, C340S622000

Reexamination Certificate

active

06973828

ABSTRACT:
An improved liquid level sensor is disclosed which provides a reliable and simple device for accurately determining the level of a liquid within a vessel. The sensor utilizes a plurality of thermocouple junctions grouped in pairs with the pairs being spaced along a line extending generally in the direction in which the liquid level may vary. A first thermocouple junction of each pair is located in relatively close thermal proximity to an electrically powered heater and the second of each pair of thermocouple junctions is spaced away from the heater. The thermocouple junctions are connected in series and produce a signal indicative of the level of liquid along the sensor. Alternatively, a single threshold liquid level sensor is provided for use with a hermetic interface to provide a signal to indicate a level of liquid within a container. Additionally, a pressure sensing circuit may also be incorporated with either liquid level sensor.

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patent: 5626053 (1997-05-01), Williamson
patent: 5627523 (1997-05-01), Besprozvanny et al.
patent: 5719332 (1998-02-01), Wallrafen

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