6.1 Emission testing should follow the requirements of the NOX
Technical Code 2008, chapter 5, and associated appendices, except as
provided for in these guidelines.
6.2 CO2 should be measured using an analyser operating on
non-dispersive infrared (NDIR) principle and with additional equipment such as dryers as
necessary. SO2 should be measured using analysers operating on non-dispersive
infrared (NDIR) or non-dispersive ultra-violet (NDUV) principles and with additional
equipment such as dryers as necessary. Other systems or analyser principles may be
accepted, subject to the approval of the Administration, provided they yield equivalent
or better results to those of the equipment referenced above. For acceptance of other
CO2 systems or analyser principles, the reference method should be in
accordance with the requirements of appendix III of the NOX Technical Code 2008.
6.3 Analyser performance should be in accordance with the requirements of
sections 1.6 to 1.10 of appendix III of the NOX Technical Code
2008.
6.4 An exhaust gas sample for SO2 should be obtained from a
representative sampling point downstream of the EGC unit.
6.5 SO2 and CO2 should be monitored using either in situ or
extractive sample systems.
6.6 Extractive exhaust gas samples for SO2 determination should
be maintained at a sufficient temperature to avoid condensed water in the sampling
system and hence loss of SO2.
6.7 If an extractive exhaust gas sample for determination needs to be dried prior to
analysis it should be done in a manner that does not result in loss of SO2 in
the sample as analysed.
6.8 The SO2 and CO2 values should be compared on the basis of the
same residual water content (e.g. dry or with the same wetness fraction).
6.9 In justified cases where the CO2 concentration is reduced by
the EGC unit, the CO2 concentration can be measured at the EGC unit inlet,
provided that the correctness of such a methodology can be clearly demonstrated. In such
cases the SO2 and CO2 values should be compared on a dry basis. If
measured on a wet basis the water content in the exhaust gas stream at those points
should also be determined in order to correct the readings to dry basis values. For
calculation of the CO2 value on a dry basis, the dry/wet correction factor
may be calculated in accordance with paragraph 5.12.3.2.2 of the NOX Technical Code 2008.