5.5.2 Manual O
2
Calibration using the Field Communicator -
HART
To perform a manual O
2
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. Select DIAG/SERVICE from DEVICE SETUP menu.
2. Select CALIBRATION from the DIAG/SERVICE menu.
3. Select CAL CONTROL from the CALIBRATION menu.
4. Select CAL METHODS from the CAL CONTROL menu.
5. From the CAL METHODS menu, select the type of calibration desired: O2 Calibration.
6. In the first Calibration screen, a Loop should be removed from automatic control
warning appears. Remove the Hazardous Area OCX 8800 from any automatic control
loops to avoid a potentially dangerous operating condition and press OK.
7. The Calibration screen should look like the following. Press OK to continue.
• OCX: TAG NAME
• STATUS: Idle
• TIME REMAIN: 0s
• O2: 0.4 %, 85.95mV
• OK/NEXT to Select
• ABORT/CANCEL to Exit
8. 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
9. When the Calibration Status is at the AppO2Low step, switch on O2 Low Gas. Verify the
O2 concentration measured matches the O2 LOW GAS parameter in the Setup. Press
OK when ready.
10. Select Start/Next Cal Step to start applying the O2 Low Gas. The time to apply the test
gas is specified by the Gas Time.
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