Rosemount 375 basic setup hart

We see this issue when there is not enough loop resistance between the power supply and the transmitter, and also when we are bench testing close to a regulated power supply or a very short wire run in the field.

To increase the resistance we will demonstrate how adding a ohm resistor in series will help the HART communicator recognize the transmitter. For this demonstration, I have a regulated power supply, two wire cable, pressure transmitter, and a HART communicator.

This first demonstration will illustrate when the pressure transmitter is wired to the regulated power supply without enough load resistance. When the communicator is initialized it does not recognize the pressure transmitter. As you can see the communicator indicates no device found. In this next demonstration, I have swapped out the wire with different test wire that I soldered a ohm resistor.

This resistor is in series between the regulated power supply in the pressure transmitter. Now as I hook up to and initiated it searches for to the pressure transmitter. Now that the HART communicator is communicating with the pressure transmitter. You will be able to change the needed software parameters. Bench setup for smart transmitter configuration. To power the transmitter, you will need a power supply capable of supplying at least 24VDC and a digital multimeter to measure output current.

The communicator will search for any HART-compatible device in the loop and will indicate when a connection is made. If a connection is not made, the HART communicator will indicate that no device was found. Once the communicator establishes communication with the transmitter, output units can then be set, the transmitter configured and calibrated appropriately. Email This BlogThis! Share to Twitter Share to Facebook.