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Calibration Procedures Teledyne API Model T360/T360M Operation Manual
184
5.7. CALIBRATION QUALITY
After completing one of the calibration procedures described above, it is
important to evaluate the analyzer’s calibration SLOPE and OFFSET parameters.
These values describe the linear response curve of the analyzer. The values for
these terms, both individually and relative to each other, indicate the quality of
the calibration. To perform this quality evaluation, you will need to record the
values of both test functions (Section 4.2.1 or Appendix A-3), all of which are
automatically stored in the DAS channel CALDAT for data analysis,
docum
entation and archival.
Make sure that these parameters are within the limits listed in Table 5-3 and
frequently
compare them to those values on the Final Test and Checkout Sheet
that came attached to your manual, which should not be significantly different. If
they are, refer to the troubleshooting Section 8.
Table 5-3 : Calibration Data Quality Evaluation
FUNCTION MINIMUM VALUE OPTIMUM VALUE MAXIMUM VALUE
SLOPE
0.700 1.000 1.300
OFFS
-0.500 0.000 0.500
These values should not be significantly different from the values recorded on the Teledyne API Final Tes
t
and Validation Data sheet that was shipped with your instrument. If they are, refer to the troubleshooting
Section 8.
The default DAS configuration records all calibration values in channel
CALDAT as well as all calibration check (zero and span) values in its internal
memory. Up to 200 data points are stored for up 4 years of data (on weekly
calibration checks) and a lifetime history of monthly calibrations. Review these
data to see if the zero and span responses change over time. These channels also
store the STABIL value (standard deviation of CO concentration) to evaluate if
the analyzer response has properly leveled off during the calibration procedure.
Finally, the CALDAT channel also stores the converter efficiency for review and
documentation.
If your instrument has an O
2
sensor option installed, that should be calibrated as
well.
07272B DCN6552