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Flow through a differential-pressure element is proportional to the square root of the differential pressure, so a linear reading is wrong: flow% = √(DP%). That means 50% of DP signal is about 71% of flow, not half. This converts either direction and applies a low-flow cutoff.

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DP Flow (Square Root) Calculator

√DP DP flow scaler

Flow through a DP element goes as √(differential pressure). A linear scaler gives the wrong number — this doesn't.

Flow70.7 %
Flow (units)70.71
DP50.0 %

Half the DP signal is ~71% flow, not 50%. That's the trap.

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