15
Reference Manual
00809-0200-4728, Rev SA
Configuration
July 2018
Configuration
Note
The list of choices available for Units after the primary menu is dependent on your Sensor configuration
settings.
2.7 Configure dual sensor options
Dual-sensor configuration deals with the functions that can be used with a transmitter ordered with Dual
Sensor inputs. In the Rosemount 644 Transmitter these functions include:
Differential temperature
Average temperature
Hot Backup
™
and sensor drift alert diagnostics (requires option code DC)
– First good temperature (requires options S and DC, or options D and DC)
2.7.1 Differential temperature configuration
The Rosemount 644 Transmitter ordered and configured for dual-sensors can accept any two inputs then
display the differential temperature between them. Use the following procedures to configure the
transmitter to measure differential temperature.
Note
This procedure assumes the differential temperature is a calculated output of the device but does not
re-assign it as the primary variable. If it desired for Differential to be the transmitter’s primary variable
see “Mapping the HART variables” on page 11 to set it to PV.
Field Communicator
From the HOME screen, enter the Fast Key sequence.
AMS Device Manager
1. Right click on the device and select Configure.
2. In the left navigation pane choose Manual Setup.
3. On the Calculated Output Tab find the Differential Temperature group box.
4. Select Units and Damping settings then select Apply when complete.
Device Dashboard Fast Keys
2, 2, 3, 1
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