Level gauges are sized by their body length, measured from the extreme top and bottom of the gauge, and the sight length, which represents the available length of viewable window available.
The sight length determines the minimum and maximum level readings that can be obtained from a given size gauge. In the case of magnetic level gauges, the sight length is not relevant, as the float movement is the deciding factor in establishing the size of the level gauge in terms of measuring the minimum and maximum fluid levels over which the gauge will function.
Liquid level gauges can be used as drum level gauges, tank level gauges, oil level gauges or water level gauges, to name a few common applications. They can also be employed as cryogenic tank level gauges for liquified gas applications.
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