Answer / manoj kumar

There are several ways to measure the flow of fluid & gas
like magnetic flow meter, mass flow meter, based on
measurement of differential pressure like venturi, orifice
etc, turbine flow meter, positive displacement flow meter,
vortex flow meter.
Measurement of flow with the help of orifice is based on
the measurement of differential pressure across the orifice
plate. Tappings are either on the supporting flange or at D
& D/2 m away for upstream and downstream of the orifice
respectively where D id Pipe diameter in which plate is
installed.
Not all the transmitters are square root.Those transmitters
which are based on differential pressure are square root.
We can use square root at the transmitter itself or we can
make the calculation in the DCS/PLC program.
Since Q(flow) is directly proportional to square root of
the differential pressure we do the square root extraction
to measure the flow.

what is the difference between sinking and sourcing inputs and also what are there applications?

2 Answers  

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If a normal magnetic type flow transmitter that can measure flow, temperature and show this parameters on field, is it possible by any means to get this (flow and temperature) parameters info. On dcs? And if yes then with HART, FO communication or any other communication system?

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testing of thermo-couple?

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Hi Frnds , If Suppose 1 Pair cable of 1.5 sq mm is used for Transmitter and instead of 1.5 sq mm if i used 0.5 sq mm cable will the resistance change will occur and does it affect our transmitter reading. plz mail ur answer to ntnkamble@gmail.com plz immediately mail ur reply

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Make a ladder diagram on LSL valve will close, on PSL valve will open and start the motor

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How will you calibrate an Absolute Pr.Transmitter of range 400mmHg absolute ?

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in control valve is constructed as per API 6D or API 6A, then which standard is used for fire testing of valve?.

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What are the interlocks we have to check during the start up of LP/HP compressor?

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