D/A Trim Procedures - Emerson Rosemount OCX8800A Manual

Using the local operator interface (LOI)
December 2022
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
Refer to the LOI menu tree in
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.
2. From the SYSTEM menu, press Down to select Input/Output. Press Right to
3. Scroll down to the item, Trim O2 Out. Press Right to start the O
4. Remove the electronics housing cover.
5. Connect a digital multimeter to read the milliamp output from the O
6. Read the O
78
D/A trim using the local operator interface (LOI)
Press Down to select SYSTEM.
select the Analog parameters list.
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.
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
The LOI displays 4 mA...Meter. The trim program inputs the design
equivalent signal for a 4.00 mA output.
milliamp output at the digital multimeter. Use Right to select
2
each digit and use Up and Down to change the value. When the correct
value is displayed, use Enter to input the value.
Figure 4-4.
2-5, and Figure 2-6.
Manual
00809-0500-4880
trim
2
D/A
2
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