Set Up Polling For Temperature - Emerson Micro Motion 9739 MVD Configuration And Use Manual

Configuration and Use Manual
MMI-20016855

6.8 Set up polling for temperature

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ProLink III Device Tools → Configuration → Process Measurement → Temperature
Field Communicator Configure → Manual Setup → Measurements → External Compensation → External Polling
The transmitter can poll an external temperature device for current temperature data. The external
temperature value is used only by the petroleum measurement application or the concentration
measurement application. If you do not have one of these applications, do not set up polling for temperature.
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.
Tip
To obtain value from using an external temperature value, the external measurement device must be reliable
and must provide more accurate data than is available from the sensor.
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.
3. (ProLink II only) Click Apply to enable the polling controls.
4. Enter the device tag of the external measurement device.
5. Set Process Variable to Temperature.
Postrequisites
Verify that the transmitter is receiving the external data. To do this:
Using ProLink III, click ProLink → Process Variables and check the External Temperature value.
•
• Using the Field Communicator, select Overview → Primary Purpose Variables.
Need help?
If the value is not correct:
Configuration and Use Manual
Integrate the meter with the control system
June 2019
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