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It depends on the aplication. When measuring level in a tank containing condensible fluids like steam, there's a high problability to have condensation in the reference leg. To compensate for this effect, the reference leg must be filled with the same liquid that is in the tank. This liquid in the reference leg will apply a hydrostatic head pressure to the high side of the transmitter which will be equal to thenmaximun level to be measured.

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16y ago

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