Instruction Manual
IM-106-880, Rev 2.1
April 2017
13.
Press the right-pointing key when the CO reading is stable.
14.
Turn off the CO test gas and press the right-pointing key to start the CO
gas purge.
15.
When the purge period expires, the LOI display reverts to the normal
operation display. If the calibration failed, the display will indicate an
alarm condition.
Manual O
2
Calibration using the Field Communicator - HART
To perform a manual O
2
calibration using the 375 Field Communicator, use
the following procedure. If necessary, refer to Section 6, Field Communicator,
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 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
STEP: Idle
TIME REMAIN: 0s
O2: 0.4 %
O2 Snsr: 85.95mV
OK/NEXT to Select
ABORT/CANCEL to Exit
8.
From the SELECT ACTION screen, select START CAL/STEP CAL 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 CAL/STEP CAL
2.
ABORT CAL
3.
EXIT CAL
9.
When the Calibration Status is at the AppO2Low step, switch on O
2
Low Gas. Verify the O
2
concentration measured matches the O2 LOW
GAS parameter in the Setup. Press OK when ready.
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