Instruction Manual
IM-106-880, Rev 2.1
April 2017
OCX 8800
5-15
COe D/A trim procedure using HART
Use the following procedure to perform the COe D/A trim procedure using the
Field Communicator. If necessary, refer to Section 6, Field Communicator,
Field Communicator, for the HART menu tree.
NOTE
To select a menu item, either use the up and down arrow keys to scroll to the
menu item and press the right arrow key or use the number keypad to select
the menu item number.
To return to a preceding menu, press the left arrow key.
1. From the
DIAG/SERVICE
menu, select
D/A TRIM
. Press the up or
down arrow to select
COe D/A Trim
.
2. Press the right arrow key to start the procedure. (If you wish to exit D/A
Trim with no changes, select
ABORT
.)
3. The Field Communicator displays
WARNING: Loop should be
removed from automatic control
. Remove the OCX 8800 from any
automatic control loops to avoid a potentially dangerous operating
condition and press
OK
.
4. The Field Communicator displays
Connect reference meter to
Combustibles output
.
5. Remove the electronics housing cover.
6. Refer to Figure 2-6. Connect a digital multimeter to read the milliamp
output from the COe D/A converter circuit. Connect the positive lead to
the AOUT2+ terminal and connect the negative lead to the AOUT2-
terminal. Then, press
OK
at the HART communicator.
7. The Field Communicator displays
Setting Fld dev output to 4 mA
.
Press
OK
. Read the COe millamp output at the digital multimeter. Enter
the reading at the Field Communicator and press
ENTER
. (Select
ABORT
to exit without changes).
8. The Field Communicator displays
Setting Fld dev output to 20 mA
.
Press
OK
. Read the COe millamp output at the digital multimeter. Enter
the reading at the Field Communicator and press
ENTER
. (Select
ABORT
to exit without changes).
9. The Field Communicator displays
Setting Fld dev output to 4 mA
.
Press
OK
.
10. The Field Communicator displays
Fld dev output 4.00 mA equal to
reference meter?
Using the up or down arrow, select
1 Yes
or
2 No
and Press
ENTER
. If
No
, the process repeats from step 6.
11. The Field Communicator displays
Setting Fld dev output to 20 mA
.
Press
OK
.
12. The Field Communicator displays
Fld dev output 20.00 mA equal to
reference meter?
Using the up or down arrow, select
1 Yes
or
2 No
and Press
ENTER
. If
No
, the process repeats from step 7.
13. The Field Communicator displays
NOTE: Loop may be returned to
automatic control
.
Summary of Contents for OCX 8800
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