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2Problem Solutions – Instrumentation

S_2.1 2.4.1.1

Ignoring duct pressure losses, this will be the density at entry to the venturi (pressure p₁).

If p₂ at the throat is close to p₁,

We should do a check now that the assumption of p₂/p₁ (=[101 − 0.4]/101 = 0.996) being close to 1 was OK. May also substitute in Equation 2.6 to check that the correct mass flow rate is obtained.

S_2.2 2.2

DP cell signal must remain the same

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