Answer Posted / sameer gadekar

If we use the voltage signal then at the certain distance the voltage level may drop due to the losses like resistance of cable capacitance inductance etc etc
These losses are not present in the current signal.
Secondly if the sensor is not working or cable is ok or not this can not be detected with 0-10v, or 0-20 ma so that 4-20ma signal is used in hart protocol.

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