Answer / sk sazzadur rahaman

In case of 4 wire transmitter, 2 wire is used to give power
and other 2 wire to transmit the signal. In case of 2 wire
transmitter, the 2 wire carries the power as well as the
signal. Example- 4to 20 mA is flowing through the 2 wire
and according to level the current is changing.

Answer / gajanand solanki

The above answer is correct.
Regarding application
2 Wire transmitter is used if your cable length is small
if the length between transmitter and controller is more we
will use 4 wire transmitter.

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