37
Reference Manual
00809-0200-4728, Rev SA
Configuration
July 2018
Configuration
AMS Device Manager
1. Right click on the device and select Configure.
2. In the left navigation window select Manual Setup.
3. On the HART tab find the Burst Mode Configuration group box and fill in the necessary content.
4. Select Apply when complete.
2.13.2 Set process variable output order
To set the process variable output order, follow the steps in one of the methods outlined in “Mapping the
HART variables” on page 11.
Note
Take careful note of the process variable output order. The HART Tri-Loop must be configured to read the
variables in the same order.
Special considerations
To initiate operation between a Rosemount 644 Transmitter with dual-sensor option and the HART
Tri-Loop, consider the configuration of both the differential, average and first good temperatures, sensor
drift alert, and Hot Backup features (if applicable).
Differential temperature measurement
To enable the differential temperature measurement feature of a dual-sensor 644 operating in
conjunction with the HART Tri-Loop, adjust the range end points of the corresponding channel on the
HART Tri-Loop to include zero. For example, if the secondary variable is to report the differential
temperature, configure the transmitter accordingly (see “Mapping the HART variables” on page 11) and
adjust the corresponding channel of the HART Tri-Loop so one range end point is negative and the other
is positive.
Hot Backup
To enable the Hot Backup feature of a Rosemount 644 Transmitter with dual-sensor option operating in
conjunction with the HART Tri-Loop, ensure that the output units of the sensors are the same as the units
of the HART Tri-Loop. Use any combination of RTDs or thermocouples as long as the units of both match
the units of the HART Tri-Loop.
Using the Tri-Loop to detect sensor drift alert
The dual-sensor Rosemount 644 Transmitter sets a failure flag (through HART) whenever a sensor failure
occurs. If an analog warning is required, the HART Tri-Loop can be configured to produce an analog
signal that can be interpreted by the control system as a sensor failure.
Use these steps to set up the HART Tri-Loop to transmit sensor failure alerts.
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