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for H20 vapour removed, and subsequent correction
for inlet water vapour and water of combustion is
required.
C) Calibration curves:
i) Analysers with a linear signal output characteristic
shall be checked on all working ranges using calibration
gases at known concentrations of approximately
0,30,60 and 90 per cent of full scale. Thc
maximum response deviation of any of these
points from a least squares straight line, fitted to
the points and the zero reading, shall not exceed
+2 per cent of the full scale value. If it does then
a calibration curve shall be prepared for
operational use.
ii) Analysers with a non-linear signal output characteristic,
and those that do not meet the requircmcnts
of linearity given above, shall have calibration
curves prepared for all working ranges using
calibration gases at known concentrations of
approximately 0, 30, 60 and 90 per cent of full
scale. Additional mixes shall be used, if
necessary, to define the curve shape properly.
ATTACHMENT C TO APPENDIX 3. SPECIFICATION FOR NO, ANALYSER
Note.- See Attachment D for information on calibration values, consistent with the local pressures, which avoid
and test gases. condcnsation of water.
1. As indicated in 5.4 of Appendix 3, the measurement
of the oxides of nitrogen concentration shall be by the
chemiluminescent technique in which radiation emitted by the
reaction of NO and O3 is measured. This method is not
sensitive to NO2 and therefore the sample shall be passed
through a converter in which NO2 is converted to NO before
the measurement of total NO,, is made. Both the original NO
and the total NO, concentrations shall be recorded. Thus by
difference, a measure of the NO, concentration shall be
obtained.
Precautions: The performance specifications indicated are
generally for analyser full scale. Errors at part scale may be
a significantly greater percentage of reading. The relevance
and importance of such increases shall be considered when
preparing to make measurements. If better performance is
necessary, then appropriate precautions shall bc taken.
3. The principal performance specification, determined
for the instrument operated in an ambient temperature stable
to within 2'C, shall be as follows:
2. The instrument to be used shall be complete with all a) Total range: 0 to 2 500 ppm in appropriate ranges.
necessary flow control components, such as regulators, b) Resolution: better than 0.5 per cent of full scale of
valves, flowmeters, etc. Materials in contact with the sample range used or 1 ppm, whichever is greater.
gas shall be restricted to those which are resistant to attack by
oxides of nitrogen, such as stainless steel, glass, etc. The c) Repeatabilip: better than &I per cent of full scale of
temperature of the sample shall everywhere be maintained at range used, or &I ppm, whichever is greater.
-2W3197
No. 3
Annex 16 - Environmental Protection Volume I1
d) Stahiliry: better than +2 per cent of full scale of range
used or +I ppm, whichever is greater, in a period of
1 hour.
e) Zero drift: less than +1 per cent of full scale of range
used or el ppm, whichever is greater, in a period of
1 hour.
f) Noise: 0.5 Hz and greater, less than k1.0 per cent of
full scale of range used or +1 ppm, whichever is
greater, in a period of 2 hours.
g) Interference: suppression for samples containing CO,
and water vapour, shall be limited as follows:
- less than 0.05 pcr cent readinglper cent CO,
concentration;
- less than 0.1 per cent readinglper cent water
vapour concentration.
If the interference limitation(s) for CO, andor water vapour
cannot be met, appropriate correction factors shall be
determined, reported and applied.
Note.- It is recommended as consistent with good
practice that such correction procedures be adopted in all
CCISCS.
h) Response time: shall not exceed 10 scconds from inlet
of the sample to the analysis system to the
achievement of 90 per cent of thc final reading.
i) Linearily: better than *2 per cent of full scale of
range used or +2 ppm, whichever is greater.
j) Converter: this shall be designed and operated in such
a matter as to reduce NO2 present in the sample to
NO. The converter shall not affect the NO originally
in the sample.
The converter efficiency shall not be less than 90 per cent.
This efficiency value shall be used to correct the measured
sample NO, value (i.e. [NO,], - [NO]) to that which would
have been obtained if the efficiency had not been 100 per
cent.
ATTACHMENT D TO APPENDIX 3. CALIBRATION AND TEST GASES
　
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