what is the difference about HART, and 4-20mA signal?
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Answer Posted / haridass
HART Communicator - is a device used to communicate with
the HART / SMART family transmitters, used in the process
control.
* To monitor the PV, Current mA value, Sensor Temperature,
* It is used to re-range the transmitter,
* damping adjustment,
* trimming the sensor of zero/lower/upper ranges.
* create the tags/messages of the transmitter.
* Review the complete details of the transmitter.
* Loop testing the control loop (Indicator/Controller), etc.
Whereas the 4-20 mA source is used for the following:
* To simulate the 4-20 mA signal (For calibration of
control valves, loop testing of the closed/open loop).
* Using the high accuracy 250 ohms resistor, we can get 1-
5vdc as the output which is useful for the DCS input.
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