Smart transmitters superimpose modulated communication signal on the analog current that also powers the transmitter.
Smart transmitters incorporate remote calibration, advanced diagnostics and built-in control capabilities and wireless operation. This information can contain device status, maintenance requirements, sensor failure indication, sensor open circuit indication and much more.
Due to extreme environmental conditions in the thermal power plant, corrosion may occur in lead wires. HART Tx continuously monitors resistances of the sensor connection cables and give a warning so that preventive maintenance measures can be carried out with no measurement degradation.
HART Smart Transmitters
Parts of Smart Transmitter
1)sensor
2) signal conditioning
3) sensor excitation
4) user interface
5) Serial port
6) analog current output
7) power supply circuits