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Differential pressure used to determine the flow rate is one of the oldest and widely used technique of flow measurement. Differential pressure is generated by creating obstruction to the moving flow. The pressure difference created is measured through pressure taps provided on upstream and downstream side of obstruction. This differential pressure can be measured using devices like manometer or DP transmitter. Based on the differential pressure value, the flow rate is calculated.
The differential pressure-based flow meters are of following types