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First of all you have to know the gravities of the liquids you want to measure.

For example crude oil's gravity is 0.87 and water's gravity is 1.

A level transmitter uses 2 inlets, including the area of the level you want to observe.

You meter the distance (the height) between the two inlets.

CALIBRATION:

You fill the container with the heavier liquid, till the gravity's percent (%). Adjust for ZERO.

Fill till 100% to have the SPAN.

The gravity selector must be at the right position.

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