Emerson Micro Motion Configuration And Use Manual page 50

Configure process measurement
Important
Line pressure data is used in several different measurements and calculations. The transmitter stores
only one pressure value, which may be either the external pressure or the configured fixed value.
Accordingly, if you choose a fixed pressure for some uses, and an external pressure for others, the
external pressure will overwrite the fixed value.
Prerequisites
If you plan to poll an external device, the primary mA output must be wired to support
HART communications.
You must be using gauge 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.
Method Description
Internal tempera- Temperature data from the on-
ture board temperature sensor
(RTD) will be used for all meas-
urements and calculations. No
external temperature data will
be available.
Polling The meter polls an external de-
vice for temperature data. This
data will be available in addi-
tion to the internal tempera-
ture data.
44
Choose the method to be used to supply temperature data, and perform the
required setup.
Setup
a. Choose Configure > Manual Setup > Measurements > External Inputs
> Temperature.
b. Set External Temperature to Disable.
a. Choose Configure > Manual Setup > Measurements > External Inputs
> Temperature.
b. Set External Temperature to Enable.
c. Choose Configure > Manual Setup > Inputs/Outputs > External Device
Polling.
d. Choose an unused polling slot.
e. Set Poll Control to Poll as Primary or Poll as Secondary.
Option Description
No other HART masters will be on the
Poll as Primary
network. The Field Communicator is not
a HART master.
Poll as Secondary Other HART masters will be on the net-
work. The Field Communicator is not a
HART master.
f. Set External Device Tag to the HART tag of the external tem-
perature device.
g. Set Polled Variable to Temperature.
Micro Motion ® Fork Density Meters (FDM)