Differential pressure (DP) can be used to measure the level in a closed tank by measuring the pressure difference between the bottom of the tank and the vapor space above the liquid. This pressure difference is directly proportional to the height of the liquid column in the tank. A differential pressure transmitter is used to measure this pressure difference. The transmitter has two pressure ports: a high-pressure port (+) and a low-pressure port (-). The high-pressure port is connected to a tap at the bottom of the tank, which measures the total pressure at the bottom, incl....
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