Difference Between Smart and Hart Transmitters

The major difference is Hart transmitter shall meet HART standard. Therefore, you can get into Hart website to know more information.

Hello Guest,

"Smart" is a descriptive term for the whole hardware.

"Hart" is the software which enables the so called 'smart' hardware to work!

Just as we call a phone a 'smart device', it is simply saying it can 'measure and transmit' and reset it's-self, and do various other things?

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If you read this short piece below it will become clear.=

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One of the features of smart field devices is their ability to detect faults, either in the device electronics or in an associated sensor.

Using HART, such faults are reported in the device status byte in every message (assuming that communication is still possible!).

But, for the benefit of systems not using HART communication, it is still useful to follow the convention of indicating fault conditions by setting the analogue output current to a value which is recognisably beyond the normal operating range (including the small amount of linear over-range commonly allowed).

If it is still alive, the microprocessor program should set the current output value to an appropriate value.

Otherwise, a watchdog timer circuit may be able to do this, even if the microprocessor itself has failed.

The intention is that a host system should be able to set alarm thresholds just outside the normal 4 mA to 20 mA range, to indicate measurement out-of-range, and to set further alarm thresholds to indicate a fault condition.

Take care.