Rosemount 3144 - Drift Alert

3-11
On-line Operations
To set up and enable the Hot Backup feature for the Model 3244MV
transmitter, perform the following procedure:
1. Attach two different sensors of any type to the transmitter as
shown in Figure 2-7 on page 2-9.
2. From the Home screen, select 1 Device Setup, 1 Process Variables,
8 Variable Re-map to set primary, secondary, tertiary, and
quaternary variables. The communicator displays the PV, SV, TV,
and QV menus in succession.
3. Set PV as Sensor 1 or Sensor Average; set SV, TV, and QV as
desired.
4. Select OK after verifying the variable settings from the Variable
Mapping menu.
5. Select OK to return the control loop to automatic control, and
HOME to return to the Home screen.
6. From the Home screen, select 1 Device Setup, 4 Detailed Setup,
1 Sensors, 1 Process Sensor, 4 Sensor Setup, 1 Sensor 1 Config to
configure Sensor 1.
7. Set the sensor type, number of wires, damping, and units for
Sensor 1.
8. Select SEND to download the new data to the transmitter, and
HOME to return to the Home screen.
9. Repeat Steps 5 and 6 for Sensor 2.
10. From the Home screen, select 1 Device Setup, 4 Detailed Setup,
1 Sensors, 1 Process Sensor, 4 Sensor Setup, 3 Config Hot Backup
to prepare to configure the transmitter for Hot Backup.
11. Select OK after you set the control loop to manual.
12. Select Hot Backup Enabled.
13. Select OK after you return the control loop to automatic control.
For information on using Hot Backup in conjunction with the HART
Tri-Loop see page 2-16.
Drift Alert
(1)
The Drift Alert command allows you to configure the transmitter to
send a message via HART or go into analog alarm when the
temperature difference between Sensor 1 and Sensor 2 exceeds a
user-defined limit. This feature is especially useful when measuring the
same process temperature with two sensors, ideally a dual-element
sensor. When Drift Alert Mode is enabled the user will set the
maximum allowable difference, in engineering units, between Sensor 1
and Sensor 2. If this maximum difference is exceeded a drift alert
warning message will be sent via HART.
When configuring the transmitter for Drift Alert the user also has the
option of specifying that the analog output of the transmitter go into
alarm when sensor drifting is detected.
Model 3244MV
HART Fast Keys 1,4,1,1,4,4
(1) Drift Alert is not available in previous versions of the Model 3244MV transmitter.