Teledyne 9110EH - Nitrogen Oxides Analyzer - Manual (Page 151)

Model 9110EH Instruction Manual EPA Protocol Calibration
Figure 8-1: GPT Calibration System
Converter efficiency should be set prior to calibration since its value is used in the
computation of the NO
X
and NO
2
concentration outputs.
The analyzer should be calibrated on the same range used for monitoring.
If auto ranging or independent range options are selected the highest of the ranges will
result in the most accurate calibration, and should be used.
Make sure the GPT calibration system can supply the range of concentrations at a sufficient
flow over the whole range of concentrations that will be encountered during calibration.
8.3.1. Zero Calibration
The zero point calibration procedure is identical to that described in Sections 7.2, 7.4 or 7.5
of this manual.
8.3.2. Span Calibration
Adjust the NO concentration to approximately 80% of the URL of the NO channel. The
expected NO and NO
X
span concentrations can be determined by measuring the cylinder
and diluent flows and computing the resulting concentrations. If there is any NO
2
impurity
in the NO standard gas it should be taken into account when the NO
X
concentration is
entered during the NO/NO
X
channel calibration. This is done by ADDING the impurity
concentration to the NO concentration to get the NO
X
concentration for calibration.
Calculate the exact NO and NO
X
concentrations as follows:
M9110EH Rev 0 137