Level: A visual concept

Gillum, Don
April 2008
InTech;Apr2008, Vol. 55 Issue 4, p62
The article focuses on the methods of level measurement. Level can be measured by direct, which employ physical principles, and inferred methods, which involve the use of hydrostatic head, weight quantities and density. The earliest instruments used were sticks or poles with calibrated scales to test the depths of streams. Drawbacks include performing an action and absence of a continuous representation of the process measurement. A sight glass is an important instrument for visually determining level quantities. Gage classes can be classified in terms of low- and high-pressure processes. A recent innovation involves the use of fiber-optic cables to transport light generated by a bicolor boiler-water-level gage system.


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