Device for indicating level of liquid contents of a container

Details Device for indicating level of liquid contents of a container Device for indicating level of liquid contents of a container

G - Physics

01

F

116/69

G01F 23/00 (2006.01) G01F 23/22 (2006.01) G01F 23/292 (2006.01)

Patent

CA 1211003

ABSTRACT OF THE DISCLOSURE A device for providing a visual indication of the level of liquid contained in a container having walls with good heat conducting properties comprises a number of temperature-sensing strips each including at least one liquid crystal composition. The temperature-sensing strips exhibit colour play over a plurality of narrow, spaced apart temperature ranges selected so that at least one strip will exhibit colour play when detecting a tem- perature gradient on the external surface of the walls of the container. Such a temperature gradient occurs adjacent the level of the contained liquid as a result, at least in part, of vaporisation of the liquid occasioned by withdrawing some of the contents from the container.

449232

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