Teledyne T200, Operation Manual, Page: 205 / 425

Teledyne API
– T200 NO/NO
2
/NO
X
Analyzer Operation Manual Calibration Procedures
203
9.6. CALIBRATION QUALITY ANALYSIS
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
X
. 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 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.
Table 9-5: Calibration Data Quality Evaluation
Function Minimum Value Optimum Value Maximum Value
NOX SLOPE -0.700 1.000 1.300
NO SLOPE -0.700 1.000 1.300
NOX OFFS -20.0 mV 0.0 mV 150.0 mV
NO OFFS -20.0 mV 0.0 mV 150.0 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
X
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.
06858E DCN7057