Method and apparatus for detecting the level of a liquid

Details Method and apparatus for detecting the level of a liquid Method and apparatus for detecting the level of a liquid

2005-10-20

2008-07-01

Larkin, Daniel S. (Department: 2856)

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Interface

C073S295000

Reexamination Certificate

active

07392691

ABSTRACT:
A system for determining the position of a gas/liquid interface of a fluid in a tank having a probe and a controller. The probe has silicon diodes arranged linearly on a substrate. The controller applies power to each of the silicon diodes to make a determination of whether a fluid in which the silicon diode is immersed is a liquid or a gas based on a rate of transfer of heat from the silicon diode to the fluid. A method for determining the phase of a fluid in which a sensor is immersed includes the steps of immersing the sensor in a fluid and increasing power applied to the sensor. The value of a thermal transient of the sensor is then measured and the phase of the fluid is determined based on the measured value of the thermal transient.

REFERENCES:
patent: 3465587 (1969-09-01), Pierce
patent: 3734123 (1973-05-01), Pomerantz
patent: 3755801 (1973-08-01), Milo
patent: 4949069 (1990-08-01), Wilson
patent: 6431750 (2002-08-01), Haberbusch et al.
“Cryo-Tracker ™ Level, Temperature, and Mass Gauging Fluid Sensors”, Sierra Lobo, Inc., Aug. 21, 2003, pp. 1-9.

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