Filter
Top Products
Xi Advanced Electronics
4-16
Instruction Manual
IM-106-910Xi, Original Issue
November 2010
7. In the first O2 CAL screen, a "Loop should be removed from automatic
control" warning appears. Remove the Xi from any automatic control
loop to avoid a potentially dangerous operating condition and press OK.
8. Follow the handheld 375/475 Field Communicator display prompts to
perform the O
2
cal procedure.
D/A TRIM
The D/A trim procedure is used to calibrate the 4-20 mA output signal to a
precision mA measurement device.
The two paragraphs that follow describe how to perform a D/A trim for two of
the three basic system configurations shown in Figure 4-10. Only the signal to
the DCS needs to be trimmed.
Figure 4-6. D/A Trim Methods,
Simplified
D/A Trim with Xi
For systems with configuration 1, shown in Figure 4-6, use the handheld
375/475 Field Communicator to access the D/A trim procedure according to
the instructions that follow. Refer to the 375/475 Field Communicator Xi Menu
Tree in Figure 4-2.
1. From the DEVICE SETUP screen select menu item 2, DIAG/SERVICE,
to access the diagnostics and service menu options.
2. Select menu item 3, CALIBRATION, to access the calibration menu
options.
3. Select menu item 3, 4-20 mA SIG, to access the 4-20 mA SIGNAL
screen.
4. Select menu item 1, D/A Trim, to start the trim procedure.
Failure to remove the Xi from automatic control loops prior to performing this procedure may
result in a dangerous operating condition.