You can remove a 2-wire HART transmitter from a loop, use the Trex unit to power the transmitter, and then measure the analog output.
If you try to apply power from the Trex unit when the device is externally-powered, the Loop Diagnostics application prevents the Trex unit from supplying power. This protects the Trex unit from damage.
Connect the lead set to the
HART + pwr terminals on the Trex unit and to
Connection for providing power to the device
- On the Loop Diagnostics screen, tap Trex Unit Power.
The Trex unit uses an internal resistor while powering the device.
The Trex unit powers the device. The voltage and current measurements are displayed.
To stop powering the device, do one of the following:
- Tap Trex Unit Power to set the option to Off.
- Tap Exit.
- Remove the lead set from the Trex unit.