Teledyne M300EM Co Calibration Quality, 5:Calibration Data Quality Evaluation, Function

Calibration Procedures Teledyne API – Technical Manual - Model 300E Family CO Analyzers

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 3.5.4 or Appendix A-3), all of which are automatically stored in the iDAS channel CALDAT for data analysis, 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 Sheet that came attached to your manual, which should not be significantly different. If they are, refer to the troubleshooting Section 12.

Table 9-5: Calibration Data Quality Evaluation

FUNCTION	MINIMUM VALUE	OPTIMUM VALUE
SLOPE	0.700	1.000
OFFS	-0.500	0.000

MAXIMUM VALUE

1.300

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 12.

The default iDAS 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 O2 or CO2 sensor option installed these should be calibrated as well.

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