Measuring and testing – Liquid level or depth gauge – Thermal type
Patent
1997-04-10
1999-04-13
Gutierrez, Diego
Measuring and testing
Liquid level or depth gauge
Thermal type
374 54, 116227, G01F 2322
Patent
active
058940898
ABSTRACT:
A liquid level indicator has a transparent vessel for retaining hot water therein and a thermo-sensitive tape (thermo-tape) attached at a side wall of the vessel with the sensing side of the thermo-tape facing the side wall of the vessel. The thermo-tape first exhibits black, then turns white after the hot water is poured into the vessel. When the thermo-tape is pressed against a partially filled liquid container, the thermo-tape turns black at one side of a boundary and turns white at the other side of the boundary that defines the liquid/gas interface in the container. This occurs because the liquid in the container cools the thermo-tape more rapidly than the gas in the container does. The boundary is observed through the walls of the transparent vessel and the hot water to detect the liquid level within the container.
REFERENCES:
patent: 3696675 (1972-10-01), Gilmour
patent: 4358955 (1982-11-01), Rait
patent: 5099688 (1992-03-01), de Mars
patent: 5304003 (1994-04-01), Winninger
patent: 5323652 (1994-06-01), Parker
patent: 5385044 (1995-01-01), Thomas et al.
patent: 5707590 (1998-01-01), Thomas et al.
Gutierrez Diego
Organo Corporation
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