What is SMART transmitter and HART transmitter ? Difference between SMART and HART device?

HART = Highway Addressable Remote Transducer-. is a communication protocol.

SMART = Single Modular Auto-ranging Remote Transducer. SMART instruments can be HART,FF or Profibus.

SMART transmitters compared to analog transmitters have microprocessor as their integral part , which helps for self diagnostic abilities , non-linear compensations , re-ranging without performing calibrations ,and ability to communicate digitally over the network.

HART standard helps instruments to digitally communicate with one another over the same two wires used to convey a 4-20 ma analog instrument signal.

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