Emerson Micro-Motion 2400S, Configuration And Use Manual, Page: 28 / 198

20 Micro Motion
®
Model 2400S Transmitters with Analog Outputs
Connecting with the 375 Field Communicator
4.3 Connecting to a transmitter
You can connect the Communicator to the transmitter’s HART clips or to a point on a HART network.
Note: The HART clips on the face of the transmitter are connected to the transmitter’s mA/HART
terminals. You may connect directly to the mA/HART terminals (terminals 1 and 2) if you have
removed the user interface module.
Note: If you are using the mA/HART terminals to report a process variable and also for HART
communications, see the transmitter installation manual for wiring diagrams.
4.3.1 Connecting to HART clips
To connect the Communicator to the transmitter’s HART clips:
1. Remove the transmitter housing cover (see Section 2.3).
2. Connect the Communicator leads to the HART clips on the face of the transmitter. See
Figure 4-1.
3. The Communicator must be connected across a resistance of 250–600
Ω
. Add resistance to the
connection. See Figure 4-1.
CAUTION
Connecting a HART device to the transmitter’s mA output terminals or HART
clips could cause transmitter output error.
If the mA output is being used for continuous control, connecting a HART interface
to the output loop could cause the transmitter’s 4–20 mA output to change, which
would affect final control devices.
Set control devices for manual operation before connecting a HART interface to the
transmitter’s mA output loop.
WARNING
Removing the transmitter housing cover in a hazardous area can cause an
explosion.
Because the transmitter housing cover must be removed to connect to the HART
clips, the HART clips should be used only for temporary connections, for example,
for configuration or troubleshooting purposes.
When the transmitter is in an explosive atmosphere, use a different method to
connect to your transmitter.