A Venturi meter determines fluid flow velocity by measuring a pressure differenc

Question

A Venturi meter determines fluid flow velocity by measuring a pressure difference. This can be done using two independant pressure sensors, P1 and P2, or a single pressure transducer that measures the pressure differential directly, DP-P1-P2. The venturi formula is given as: w = K*(P1-P2)0.5 Assume that K is a known constant and P1 4 psi, P2 3 psi, and DP-1 psi. Assume that these are measured with a relative uncertainty (eg, 10% uncertainty is up! 0.1xpl). Which of the following will result in the least flow measurement uncertainty. Using two independent pressure sensors with 5% uncertainty. O using a single differential pressure sensor with 20% uncertainty. Neither. Both options result in equal uncertainty

Explanation / Answer

Using two independent pressure sensors with 5% uncertainity is better since it would lead to low measurement uncertainity.

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