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Answer Posted / jazz
4-20 mA signal differentiates live process 0% with 4mA
signal with a wire break (0 mA), current is also used for
transmission because even if your receiver or PLC/DCS card
is far away current signal sent proportionately by the
transmitter will be received as the same current at the
receiver/PLC/DCS card, although it is converted as a voltage
signal (1 to 5 VDC) by a 250ohm resistor, since
micro-processor process signals in voltage levels.
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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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