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Instruction Manual
IM-106-880C, OI
September 2009
3-9
Hazardous Area OCX 8800
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 Hazardous Area OCX 8800
software and is not user adjustable. The tolerance is different between the
oxygen and combustibles test gases. For oxygen, the calibration will fail if the
measured value differs by more than ±10% of the configured value. For
combustibles, the calibration will fail if the measured value differs by more
than ±30% of the configured value.
A Hazardous Area OCX 8800 shipped from the factory must be configured
before the calibration tolerance feature can be implemented. This same
process must be performed any time a replacement card stack is installed.
Configuring the Calibration Tolerance Feature with the Field
Communicator - HART
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, select O2 Tol Check. Select On to enable
the calibration tolerance feature.
5. Back out to the CAL SETUP menu, select COe CAL PARAMS.
6. To enable the calibration tolerance feature for the combustibles
calibration, from the COe CAL PARAMS, select COe Tol Check.
Select On to enable the calibration tolerance feature.
Configuring the Calibration Tolerance Feature with the Field
Communicator - Fieldbus
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 menu, 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.
Configuring the Calibration Tolerance Feature with the LOI
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:
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.