Emerson Network Router Manuel D’Utilisation
Installation and Use Manual
65
Transmitter Configuration, Characterization, and Calibration
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5. If you will use a static pressure value:
a.
Type the pressure value in the
External Pressure
box.
b.
Click
Apply
.
c.
Ensure that neither polled variable is configured to poll for pressure. Polling for
temperature is allowed. See Section 5.8.
temperature is allowed. See Section 5.8.
5.7
Compensating for temperature
Temperature data are used in several different calculations. Micro Motion sensors always report
temperature data to the transmitter. For greater accuracy, you can configure the transmitter to use a
different temperature value:
temperature data to the transmitter. For greater accuracy, you can configure the transmitter to use a
different temperature value:
•
If the temperature is a known static value, you may choose to enter the external temperature in
the software and not poll a temperature measurement device.
the software and not poll a temperature measurement device.
•
If the operating temperature varies significantly, you may choose to have the transmitter poll
for an updated temperature value from an external temperature measurement device. Polling
requires HART protocol.
for an updated temperature value from an external temperature measurement device. Polling
requires HART protocol.
Note: If you have core processor v2.1 or earlier, the external temperature data are used for all
calculations that require temperature or values. If you have core processor v2.2 or later, the external
temperature data are used only for calculation of the derived variable in enhanced density
applications or the CTL (Correction for Temperature on volume of Liquids) value in petroleum
measurement applications.
calculations that require temperature or values. If you have core processor v2.2 or later, the external
temperature data are used only for calculation of the derived variable in enhanced density
applications or the CTL (Correction for Temperature on volume of Liquids) value in petroleum
measurement applications.
Note: If you poll for temperature, ensure that the external temperature measurement device is
accurate and reliable, and ensure that the transmitter is configured to use the same temperature unit
that the external temperature measurement device is using.
accurate and reliable, and ensure that the transmitter is configured to use the same temperature unit
that the external temperature measurement device is using.
To enable and configure temperature compensation:
1. From the
View
menu, select
Preferences
and ensure that the
Use External Temperature
checkbox is checked.
2. If you will poll an external device for temperature data, follow the polling setup instructions in
3. If you will use a static temperature value:
a.
Open the
Configuration
panel and click the
Temperature
tab.
b.
Type the temperature value in the
External Temperature
box.
c.
Click
Apply
.
d. Ensure that neither polled variable is configured to poll for temperature. Polling for
pressure is allowed. See Section 5.8.