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1. Verify the HART tag of the external device.
2. Verify that the external device is powered up and online.
3. Verify the HART/mA connection between the transmitter and the external measurement
device.
6.9 Set up polling for pressure
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ProLink II ProLink > Configuration > Polled Variables > External Pressure
Field Communicator Configure > Manual Setup > Measurements > External Compensation > External Polling
Overview
The transmitter can poll an external pressure device for current pressure data. The
pressure value is used only for pressure compensation. If you are not implementing
pressure compensation, do not set up polling for pressure.
Tip
To obtain value from pressure compensation, the external measurement device must be reliable and
accurate.
Prerequisites
Polling requires HART protocol over the Bell 202 physical layer. Ensure that the primary mA
output on your transmitter has been wired for HART protocol, and that the external
measurement device is accessible over the HART network.
Procedure
1. Select Polled Variable 1 or Polled Variable 2.
2. Set Polling Control.
Polling Control determines how the transmitter will access the external
measurement device.
Option
Description
Primary
The transmitter is the only device that will access the external measurement
device as a primary master.
Secondary
Another device on the network will access the external measurement device as
a primary master.
Tip
If you set up polling for both temperature and pressure, use the same Polling Control option for
both. If you do not, Primary will be used for both devices.
Integrate the meter with the control system
122 Micro Motion
®
9739 MVD Transmitters