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preparing to make measurements. If better performance is
necessary, then appropriate precautions shall be taken. If the interference limitation(s) for CO, andlor water vapour
cannot be met, appropriate correction factors shall be
The principal performance specification shall be as determined, reported and applied.
follows:
CO Analyser
Note.- It is recommended as consistent with good
practice that such correction procedures be adopted in all
cases.
a) Total range: 0 to 2 500 ppm in appropriate ranges.
b) Resolution: better than 0.5 per cent of full scale of CO, Analyser
range used or 1 ppm, whichever is greater. a) Total range: 0 to 10 per cent in appropriate ranges.
c) Repeatability: better than 11 per cent of full scale of
range used, or k2 ppm, whichever is greater. * Need not apply where measurements are on a "dry" basis.
-2013197
No. 3
Annex I6 - Environmental Protection Volume I1
b) Resolution: better than 0.5 per cent of full scale of
range used or 100 ppm, whichever is greater.
c) Repeatability: better than k1 per cent of full scale of
range used or &lo0 ppm, whichever is greater.
d) Stability: better than 52 per cent of full scale of range
used or &I00 ppm, whichever is greater, in a period
of 1 hour.
e) Zero drifi: less than &1 per cent of full scale of range
used or *I00 ppm, whichever is greater, in a period
of 1 hour.
f) Noise: 0.5 Hz and greater, less than rl per cent of
full scale of range used or 2100 ppm, whichever is
greater.
g) The effect of oxygen (02) on the C02 analyser
response shall be checked. For a change from 0 per
cent O2 to 21 per cent O2 the response of a given
COz concentration shall not change by more than 2
per cent of reading. If this limjt cannot be met an
appropriate correction factor shall be applied.
Note.- It is recommended as consistent with good
practice that such correction procedures be adopted
in all cases.
CO and CO, Analysers
a) Resportse time: shall not exceed 10 scconds from inlet
of the sample to the analysis system, to the
achievement of 90 per cent of the final reading.
b) Sample temperature: the normal mode of operation is
for analysis of the sample in its (untreated) "wet"
condition. T h i s requires that the sample cell and all
other components in contact with the sample in this
sub-system be maintained at a temperature of not less
than 50°C, with a stability of 22'C. The option to
measure CO and C02 on a dry basis (with suitable
water traps) is allowed, in which case unheated
analysers are permissible and the interference limits
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. The
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
42 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 requirements
of linearity given above, shall have calibration
curves 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 5. SPECIFICATION FOR
NO, ANALYSER
Note.- See Attuchment D for information on calibration
and test gases.
1. As indicated in 5.4 of Appendix 5, 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 N 4 and therefore the sample shall be passcd through
a converter in which NO2 is converted m NO beforc 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.
2. The instrument to be used shall be completc with all
necessary flow control components, such as regulators,
valves, flowmeters, etc. Materials in contact with the sample
gas shall be restricted to those which are resistant to attack by
oxides of nitrogen, such as stainless steel, glass, ctc. The
　
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