Emerson Rosemount 644 Reference Manual page 80

Section 5: Operation and Maintenance
April 2015
Use the following procedures to perform a sensor trim on the 644:
Performing a sensor trim using a Field Communicator
1.
2.
From the HOME screen, enter the Fast Key sequence.
Device Dashboard Fast Keys
The communicator will ask "Are you using an active calibrator?"
a.
b. Select Yes if using a calibration device. By selecting yes, the transmitter will switch into
Performing a sensor trim using AMS Device Manager
1.
2.
3.
Performing a sensor trim using LOI
Reference the below image for guidance on where to find Sensor Calibration in the LOI menu.
Figure 5-2. Trimming the Sensor with the LOI
VIEW CONFIG
SENSOR CONFIG
UNITS
RERANGE
LOOP TEST
DISPLAY
EXTENDED MENU EXTENDED MENU
EXIT MENU
70
Connect the calibration device or sensor to the transmitter. (If using an active
calibrator, see "Active calibrator and EMF compensation" on page
Connect the communicator to the transmitter loop.
Select No if a sensor is connected to the transmitter
active calibration mode (see "Active Calibrator and EMF Compensation"). This is critical
if the calibrator requires constant sensor current for calibration. If using a calibration
device that can accept pulsed current, select "No."
Right click on the device and select Overview.
On the main Overview tab, select the Calibrate Sensor(s) button near the bottom of
the window.
Follow the screen prompts through the Sensor Trimming process.
3, 4, 4, 1
CALIBRAT CALIBRAT
DAMPING
VARIABLE MAP
TAG
ALM SAT VALUES
PASSWORD
....
Reference Manual
00809-0200-4728, Rev RA
71)
SENSOR 1 CALIB SENSOR 1 CALIB
SENSOR 2 CALIB* SENSOR 2 CALIB*
ANALOG TRIM
FACTORY RECALL
BACK TO MENU
EXIT MENU
....
Operation and Maintenance