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Model 9110TH NOx Analyzer Calibration Procedures
Teledyne Analytical Instruments 211
9.4.3. MANUAL CALIBRATION USING VALVE OPTIONS
The following section describes the basic method for manually calibrating the 9110T NO
X
analyzer.
If the analyzer’s reporting range is set for the AUTO range mode, a step will appear for selecting which
range is to be calibrated (LOW or HIGH). Each of these two ranges MUST be calibrated separately.
9.4.3.1. Setting the Expected Span Gas Concentration
Note The expected concentrations for both NOx and NO are usually set to the
same value unless the conversion efficiency is not equal to 1.000 or not
entered properly in the conversion efficiency setting.
When setting expected concentration values, consider impurities in your
span gas source (e.g. NO often contains 1-3% NO
2
and vice versa).
The NO and NO
x
span gas concentrations should be 80% of range of concentration values likely to be
encountered in your application. The default factory reporting range setting is 500 ppb and the default
span gas concentration is 400.0 ppb.
To set the span gas concentration, press: