Calibration Quality Analysis - Teledyne T200 Operation Manual

Teledyne API – T200 NO/NO

9.6. CALIBRATION QUALITY ANALYSIS

Table 9-5: Calibration Data Quality Evaluation
Function
NOX SLOPE
NO SLOPE
NOX OFFS
NO OFFS
06858E DCN7057
/NO Analyzer Operation Manual
2 X
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, separately for NO and NO
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 the following
test functions (see Section 4.1.1), all of which are automatically stored in the DAS
channel CALDAT for data analysis, documentation and archival.
NO OFFS
NO SLOPE
NOX OFFS
NOX SLOPE
Ensure that these parameters are within the limits listed in Table 9-5 and frequently
compare them to those values on the Final Test and Validation Data Sheet (P/N 04490)
that came attached to your manual, which should not be significantly different. If they
are, refer to the troubleshooting Section 12.
Minimum Value
-0.700
-0.700
-20.0 mV
-20.0 mV
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 STB figure (standard deviation of NO
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.
Optimum Value
1.000
1.000
0.0 mV
0.0 mV
Calibration Procedures
. The
X
Maximum Value
1.300
1.300
150.0 mV
150.0 mV
concentration)
X
203