Emerson Micro Motion 4200 Configuration And Use Manual page 50

Configure process measurement applications
April 2019
Prerequisites
If you plan to poll an external device, the primary mA Output (Channel A) must be wired to support HART
communications.
The pressure measurement must be gauge pressure, not atmospheric pressure.
The pressure device must use the pressure unit that is configured in the transmitter.
If you are using an external temperature device, it must use the temperature unit that is configured in the
transmitter.
Procedure
1. Choose Device Tools > Configuration > Process Measurement > API Referral.
2. Choose the method to be used to supply temperature data, and perform the required setup.
Option Description
Polling The meter polls an external
device for temperature data.
This data will be available in
addition to the internal RTD
temperature data.
Postrequisites
If you are using external temperature data, verify the external temperature value displayed in the Inputs
group on the ProLink III main window.
The current pressure value is displayed in the External Pressure field. Verify that the value is correct.
Need help?
If the value is not correct:
• Ensure that the external device and the meter are using the same measurement unit.
• For polling:
— Verify the wiring between the meter and the external device.
— Verify the HART tag of the external device.
• For digital communications:
— Verify that the host has access to the required data.
50
Setup
a. Set Line Temperature Source to Poll for External Value.
b. Set Polling Slot to an available slot.
c. Set Polling Control to Poll as Primary or Poll as Secondary.
Option Description
Poll as Primary No other HART masters will be on the
network. The Field Communicator is
not a HART master.
Poll as Secondary Other HART masters will be on the
network. The Field Communicator is
not a HART master.
d. Set External Device Tag to the HART tag of the
temperature device.
e. Click Apply.
Configuration and Use Manual
MMI-20048166
Micro Motion 4200 Transmitters