GE XMO2, User Manual

Page: 93 / 196

September 2007
6-26 General Programming
DriftCal Enabled and One
Gas Selected (cont.)
The Perform Offset option:
This option performs an one-gas calibration of the XMO2 using the
offset gas and time interval specified in the
Set Offset Gas option.
IMPORTANT:
Be sure the XMO2 is connected to the correct offset
gas at the correct flow rate prior to using the
Perform Offset option. Refer to Chapter 4, Field
Calibration , for details.
If
[Y]
was pressed above, the XMO2 begins taking offset gas readings.
Approximately every 2.5 sec, it displays the % oxygen and the time
remaining for the calibration.
After the specified calibration time has expired, the XMO2 records
the calibration data and displays the new calibration.
Note:
If the XMO2 does not reach equilibrium before the calibration
time expires, the calibration is rejected and the error message,
“Offset Gas Calibration Error-Check Cal Gases” is displayed.
To correct the error, erase the DriftCal data in the Reset
DriftCal menu (see page 6-33).
This completes the prompts for the Perform Offset option, and the
XMO2 returns to the One-Gas DriftCal menu.
DRIFTCAL MENU
Press
[Y]
or
[Enter]
to perform an
offset calibration, or press [N] to
proceed to the next menu option.
Perform Offset?
Cal Gas ON (M:SS)
xx.xx %O2
DriftCal in Progress
Measuring Drift x.xx %O2