Emerson ROSEMOUNT OCX 8800 - Manual (Page 59)

Instruction Manual
IM-106-880, Rev 1.0
January 2007
5-5
OCX 8800
Manual COe Calibration using HART
To perform a manual COe calibration using the HART communicator or AMS,
use the following procedure. If necessary, refer to Section 4, Using HART
Communications, 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 CALIBRATION. From the
CALIBRATION menu, select PERFORM CAL.
2. From the PERFORM CAL menu, select CAL METHODS. Select COe
CALIBRATION to start COe calibration.
3. In the first COe Calibration screen, a Loop should be removed from
automatic control warning appears. Remove the OCX 8800 from any
automatic control loops to avoid a potentially dangerous operating
condition and press OK.
4. The main Calibration screen should look like the following. Press OK to
continue.
OCX: TAG NAME
STATUS: Idle
TIME REMAIN: 0s
COe: 0.20 ppm, 0.00 mV
OK/NEXT to Select
ABORT/CANCEL to Exit
5. From the SELECT ACTION screen, select START/NEXT CALSTEP to
continue calibration, select ABORT CAL to abort calibration or EXIT
CAL to exit calibration. Select one item from the list and press ENTER.
OCX: TAG NAME
SELECT ACTION
1. START/NEXT CALSTEP
2. ABORT CAL
3. EXIT CAL
6. The unit samples reference air as the COe Low Gas. The Calibration
Status should automatically change to ReadCOLow for a period of time.
During this period, if an attempt is made to go to the next calibration
step by pressing OK and selecting Start/Next Cal Step, you will be
prompted with Operator step command is not accepted at this time.
The Next Cal Step command is not accepted at this time.
7. When ready, Calibration Status will stop at the AppCOeHi. Switch on
the COe High Gas. Verify the COe concentration measured matches the
COe HIGH GAS parameter in the Setup. Press OK when ready.
8. Select Start/Next Cal Step to start applying the COe High Gas. The
time to apply the test gas is specified by the Gas Time.