Answer Posted / rakesh kumar n

My point of view is

-->12V to 35V is given as Power supply, this is given
because to switch on the transmitter

-->4 to 20mA is produced depends upon the pressure and flow
applied on the transmitter and it is given to the
microprocessor and it convert it into mA

-->Then the 4 to 20mA is converted into 1 to 5V using 250
Ohm Resistance and is given to DCS.

-->The main thing for using mA is, there won't be any
wastage in Current, but if you use V,there will be voltage
drop due to cables.

Thank you
Rakesh Kumar.N
INSTRUMENTATION ENGINEER

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