Coe Purge/Zero Feature - Emerson Rosemount OCX8800A Manual

Configuration and start-up
December 2022
3.8.2 Configure calibration tolerance with the Field
Communicator - F
Procedure
1. Use the Field Communicator or AMS software to access the Fieldbus menu.
2. From the TRANSDUCER block menu, select O2 CAL/COe CAL.
3. From the O2 CAL/COe CAL menu, select O2 CAL SETUP/COe CAL SETUP.
4. From the O2 CAL SETUP/COE CAL SETUP menu, select O2 Tolerance
3.8.3 Configure calibration tolerance with the LOI
Procedure
1. Use the Z pattern to enter the LOI menu tree.
2. From the SYSTEM menu, select Calib Setup.
3. From the Calib Setup menu, select the following:
3.9

COe purge/zero feature

This feature provides a way to periodically flood the COe sensor with air to
perform two functions:
1. Provide additional oxygen to help burn off any combustible residue from
2. Allow for optional adjustment of the COe calibration constant.
If the transmitter is configured to update the COe calibration constant, only the
constant is updated. The COe calibration slope is not affected. To update both the
constant and slope, you must do a full calibration.
The feature uses the calibration solenoid that is also used for high O
COe zero gas. For the feature to work properly, instrument air is used as the high
O test gas. This also requires the high O
2
percent. You can install a two-way valve to switch the high O
the normal calibration gas and instrument air. This allows the transmitter to use a
specified calibration gas for calibration, then instrument air for the COe zero
feature. Switching between the two gases must be manually coordinated between
scheduled calibrations and COe zero events.
When the COe zero feature is used, special pneumatic connections are required.
64
Check/COe Tolerance Check. Select Yes to enable the calibration tolerance
feature.
• O2 Tol Check: Select Yes to enable the calibration tolerance feature for
the oxygen calibration.
• Comb Tol Check: Select Yes to enable the calibration tolerance feature
for the combustibles calibration.
the COe sensor.
Fieldbus
™
OUNDATION
test gas value to be set at 20.95
2
Manual
00809-0500-4880
test gas and
2
test gas between
2
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