G - Physics – 01 – F
Patent
G - Physics
01
F
73/173, 73/181,
G01F 23/22 (2006.01) G01F 23/00 (2006.01) G01K 11/12 (2006.01)
Patent
CA 1177281
Abstract Apparatus for externally determining the level of a mass of flowable material such as liquid or granular material contained in a closed or sealed con- tainer having walls of magnetic material includes an elongate strip of thin magnetized metal sheet mate- rial coated with a thermochromatic substance which varies chromatically with variations in temperature. The elongated strip is applied to the outer surface of the wall of the container in heat conducting re- lationship thereto by magnetic attraction and extends along the height of the container. The container is exposed to a temperature change either natural, such as that which occurs at sunset and sunrise, or arti- ficially induced. Because of the difference in the rate of heat conduction of the void volume and the filled space of the container, the container wall ex- periences a temperature gradient which is most pro- nounced at the interface of the contents and the void space. The temperature of the container wall changes abruptly at the surface of the contents. This change in temperature is readily discernible visually because of the abrupt change in color of the elongaged strip at the material interface thus per- mitting an observer to readily detect the level Or the contents of the container.
386612
Marks & Clerk
Technomadic Corporation
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