General Programming 6-23
September 2007
DRIFTCAL HANDLER
Option
The original factory XMO2 calibration should be augmented by
periodic field recalibrations. An offset curve (one-gas method) or a
drift curve (two-gas method) is calculated from the new calibration
data and is then used to compensate the original factory calibration.
When taking a reading, the XMO2 uses both the Offset/Drift Curve
and any programmed background gas/pressure compensation data to
compensate the factory calibration data.
The DriftCal Handler can be either enabled or disabled in this menu.
When enabled, it allows the user to configure the XMO2 for either of
the following calibration methods:
• One-Gas (offset gas)
• Two-Gas (zero gas and span gas)
The specific DriftCal menu options that are available at any given
time are determined by the DriftCal status (enabled or disabled) and
by the number of gases specified (1 or 2). The possible combinations
are listed in Table 6-2 below.
The XMO2 should be recalibrated with a single offset gas about every
1-3 months, depending on the application. In addition, it should be
recalibrated with zero and span gases at least once per year. The
optimum calibration intervals depend on such factors as: oxygen
range, desired accuracy, gas composition, and purity of the sample
gas. See Chapter 4, Field Calibration, for the proper procedures.
Refer to Figure C-5 on page C-5 for a menu map of the DriftCal
Handler options described in this section.
Table 6-2: Available DriftCal Menu Options
Status # Gases Option Name
N.A. N.A. Enable DriftCal?
Enabled N.A. Select Number of Gases?
1 Set Offset Gas?
Perform Offset?
View Offset?
2 Set Zero Gas?
Set Span Gas?
Perform Zero Cal?
Perform Span Cal?
View Drift Curve?
Reset DriftCal?
1 or 2 Done?
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