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Calibration Procedures Teledyne API – Model T300/T300M CO Analyzer
218
9.5. CO 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 (see Section 3.4.3 or Appendix A-3), all of which are automatically stored in
the DAS channel CALDAT for data analy
s
is, documentation and archival.
Make sure that these parameters are within the limits listed below and frequently
compare them to those values on the Final Test and Validation Data Sheet that came
attached to your manual, which should not be significantly different. If they are, refer to
the troubleshooting Section 11.
Table 9-5: 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’s Final Test
and Validation Data Sheet that was shipped with your instrument.
If they are, refer to the troubleshooting
Section 11.
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 to 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 either an O
2
or CO
2
sensor option installed these should be
calibrated as well.
06864B DCN6314