Integrate the meter with the control system
7.9
Set up polling for temperature
Display
Not available
ProLink II
ProLink→Configuration→Polled Variables→External 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.
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.
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.
3.
(ProLink II only) Click
Apply
to enable the polling controls.
150
Micro Motion 9739 MVD Transmitters