Answer / 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
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