4.3.3 Third and fourth column submenus
From the second column submenus, press Right to move the display into the
third column submenus.
The third column submenu may be another menu or a list of parameters. Press
Up and Down to move the display to the different parameters or menus. The third
or fourth column submenu may be a parameter list. When a parameter list is
displayed, the cursor blinks. Press Up and Down to select the value for the
parameter displayed.
4.4 D/A trim procedures
4.4.1 O
2
D/A trim using the local operator interface (LOI)
Refer to the LOI menu tree in Figure 4-4.
WARNING
To avoid a potentially dangerous operating condition, remove the transmitter
from the automatic combustion control loop before you start the D/A trim
procedure.
Procedure
1. From the operating display, press Left to select the first column submenu.
Press Down to select SYSTEM.
2. From the SYSTEM menu, press Down to select Input/Output. Press Right to
select the Analog parameters list.
3. Scroll down to the item, Trim O2 Out. Press Right to start the O
2
trim
procedure.
Note
If you wish to exit D/A trim with no changes, step through the procedure
using Yes responses and enter no meter readings.
4. Remove the electronics housing cover.
5. Connect a digital multimeter to read the milliamp output from the O
2
D/A
converter circuit. Connect the positive lead to the AOUT1+ terminal and
connect the negative lead to the AOUT1- terminal. Then press Enter on the
LOI.
Refer to Figure 2-4, Figure 2-5, and Figure 2-6.
The LOI displays 4 mA...Meter. The trim program inputs the design
equivalent signal for a 4.00 mA output.
6. Read the O
2
milliamp output at the digital multimeter. Use Right to select
each digit and use Up and Down to change the value. When the correct
value is displayed, use Enter to input the value.
Using the local operator interface (LOI) Manual
December 2022 00809-0500-4880
78 Emerson.com/Rosemount
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