Emerson Micro Motion SGM Series - Adjust Temperature Measurement with Temperature Offset or Temperature Slope

Before you decide how to supply temperature data, consider the other ways that line temperature
data will be used and plan accordingly.
Procedure
Choose the method to be used to supply temperature data, and perform the required
setup.
Method Description Setup
Internal tempera-
ture data
Temperature data from the on-
board temperature sensor
(RTD) will be used.
a. Choose Configure > Manual Setup > Measurements > Exter-
nal Inputs > Temperature.
b. Set External Temperature to Disable.
Polling The meter polls an external de-
vice for temperature data.
a. Choose Configure > Manual Setup > Measurements > Exter-
nal Inputs > Temperature.
b. Set External Temperature to Enable.
c. Choose Configure > Manual Setup > Inputs/Outputs > Exter-
nal Device Polling.
d. Choose an unused polling slot.
e. Set Poll Control to Poll as Primary or Poll as Secondary.
f. Set External Device Tag to the HART tag of the external tem-
perature device.
g. Set Polled Variable to Temperature.
h. Choose Configure > Manual Setup > Measurements > Tem-
perature.
i. Set Temperature Unit to the unit used by the external tem-
perature device.
Postrequisites
If you are using external temperature data, choose Service Tools > Variables > External
Variables and verify the external temperature value.
13.3
Adjust temperature measurement with
Temperature Offset or Temperature Slope
You can adjust the line temperature measurement by modifying the value for
Temperature Offset or Temperature Slope. The measured temperature value is always
multiplied by the temperature slope. The temperature offset is always added to the result.
Meter-specific temperature calibration factors are determined at the factory. These values
are available on the meter tag. Temperature Offset and Temperature Slope are applied
after the temperature calibration factors.
The default value for Temperature Offset is 0. The default value for Temperature Slope is
1.0. Accordingly, the default values have no effect on the reported temperature value.
Measurement support
Configuration and Use Manual 131