Answer / pralay kumar jana

In two transmitter, power-supply is provided through two
wires and signal also returns through the same wire.

But in case of four wire transmitter, power-supply is
provided through two wires, while signal returns through two
other wires.

Answer / george s

In the two wire transmitter one wire shall be the power
wire and the other wire will be the return wire(4-20mA)

Where as in the 4 wire transmitter (2 wires for power
supply and the other two for the 4-20 mA output)

Answer / aravind

in 2 wire X'mtr we are following wheatson bridge method ,so it need only 2 wire but in 4 wire x'mtr we following induction method like limit switch so its need 4 wire

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