G - Physics – 01 – F
Patent
G - Physics
01
F
G01F 23/22 (2006.01) G01F 23/00 (2006.01)
Patent
CA 2338407
An external liquid level gauge may be provided for determining the level of the interface between a mass of flowable material and the void volume above it within a container. The external liquid level gauge is adapted to be affixed vertically to the outside wall of the container, extending along substantially the entire height. It is in the form of an elongated strip and comprises a layer of base material and a layer of thermochromatic materials. The thermochromatic layer further comprises a light absorbing background and at least two regions of thermochromatic materials which are arranged upon the light absorbing background. The regions of at least two thermochromatic materials are disposed in arrays thereof and are arranged entirely along the length of the external liquid level gauge. Moreover, each of the thermochromatic materials is arranged in an individual area and each thermochromatic material responds chromatically within a different operating temperature range. The theory is that the rate of heat transfer is different between a mass of flowable material and the void volume above it such that for any container with a modest heat conducting capability, the container wall experiences a temperature gradient which is most pronounced at and below the interface of the contents. Thus, with the use of thermochromatic materials, a vivid color change occurring at and below the interface will permit an observer to obtain a direct reading of the level of the flowable material within a container.
Marks & Clerk
Rait Joseph
LandOfFree
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