Emerson Rosemount OCX 8800 - Calibration tolerance feature

3.7 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.
3.7.1 Configuring the calibration tolerance feature with the
Field Communicator -HART
Complete the following steps to configure the calibration tolerance with the Field
Communicator using the HART communication protocol.
1. Use the 375 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.
3.7.2
Configuring the calibration tolerance feature with the
Field Communicator - Fieldbus
Complete the following steps to configure the calibration tolerance feature with the Field
Communicator using the Foundation Fieldbus communication protocol.
1. Use the 375 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 , select O2 CAL SETUP/COe CAL SETUP.
4. From the O2 CAL SETUP/COE CAL SETUP menu, select O2 Tolerance Check/COe Tolerance
Check. Select Yes to enable the calibration tolerance feature.
Configuration and startup
52 OCX 8800