Whether the DP transmitter can be utilised in the medium of
Vaccum for the measurement of Level?
Answer Posted / ahmad
yes we can use, but accuracy does matter.
Emrson & Endress Houser are also provide DP type Level Transmitter in both type of tank, open tank & close tank with better accuracy.
Why we r not using these opptions.??
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Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72
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