• Flow High Gas: Flows the high O
2
test gas for the time specified in the
calibration setup.
• Flow Low Gas: Flows the low O
2
test gas for the time specified in the
calibration setup.
• Flow COe Gas: Flows the COe gas for the time specified in the calibration
setup.
• Purge: Intitiates a delay for the specified purge time before oxygen/
combustibles readings are considered valid.
Note
A purge automatically follows a gas flow.
3.8 Calibration tolerance feature
The calibration tolerance feature provides a mechanism to fail a calibration if the
calibration measurement does not fall within a specific tolerance of the test gas
value. The tolerance is preset within the transmitter software and is not user-
adjustable.
The tolerance is different between the oxygen and combustibles test gases. For
oxygen, the calibration fails if the measured value differs by more than ±10% of
the configured value. For combustibles, the calibration fails if the measured value
differs by more than ±30% of the configured value.
A transmitter shipped from the factory must be configured before the calibration
tolerance feature can be implemented. The same process must be performed any
time a replacement card stack is installed.
3.8.1
Configure calibration tolerance with the Field
Communicator - HART
®
Complete the following steps to configure the calibration tolerance with the Field
Communicator using the HART communication protocol.
Procedure
1. Use the Field Communicator or AMS software to access the HART menu.
2. From the DETAILED SETUP menu, select CAL SETUP.
3. From the CAL SETUP menu, select O2 CAL PARAMS.
4. To enable the calibration tolerance feature for the oxygen calibration, from
the O2 CAL PARAMS menu, select O2 Tol Check. Select On to enable the
calibration tolerance feature.
5. Go back to the CAL SETUP menu and select COe CAL PARAMS.
6. To enable the calibration tolerance for the combustibles calibration, from
the COe CAL PARAMS menu, select COe Tol Check. Select On to enable the
calibration tolerance feature.
Manual Configuration and start-up
00809-0500-4880 December 2022
Rosemount OCX8800A 63
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