Teledyne 9110E - Nitrogen Oxides Analyzer - Manual (Page 143)

Model 9110E Instruction Manual Calibration Procedures
M9110E Rev B 129
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 (Section 6.2.1 or Appendix A-3), all of which are automatically stored in the iDAS
channel CALDAT for data analysis, documentation and archival.
• NO OFFS
• NO SLOPE
• NOX OFFS
• NOX SLOPE
Make sure that these parameters are within the limits listed in Table 7-5 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 trouble-
shooting Chapter 11.
Table 7-5: 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 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 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 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.