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f) Noise: 0.5 Hz and greater, less than +1 per cent of
full scale of range used or k1 ppm, whichever is
greater.
g) Interferences: to be limited with respect to indicated
CO concentration as follows:
the lattel; 1) less than 500 pprnlper cent ethylene concentration
Precautions: The performance specifications indicated are 2) less than 2 ppmlper cent CO, concentration
generally for analyser full scale. Errors at part scale may be
a significantly greater percentage of reading. The relevance 3) less than 2 pprnlper cent water vapour.*
and importance of such increases shall be considered when
preparing to make measurements. If better performance is If the interference limitation(s) for CO, andm water vapour
necessary, then appropriate precautions shall be taken. cannot be met, appropriate correction factors shall be
determined, reported and applied. - -
The principal performance specification shall be as
follows: Note.- It is recommended as consistent with good
practice that such correction procedures be adopted in all
CO Analyser cases.
a) Total range: 0 to 2 500 ppm in appropriate ranges. CO, Analyser
b) Resolution: better than 0.5 per cent of full scale of a) Total range: 0 to 10 per cent in appropriate ranges.
range used or 1 ppm, whichever is greater.
b) Resolution: better than 0.5 per cent of full scale of
c) Repeatability; better than 21 per cent of full scale of range used or 100 ppm, whichever is greater.
range used, or %2 ppm, whichever is greater.
c) Repeatabilily: better than k1 per cent of,full scale of
d) Srability: better than *2 per cent of full scale of range range used or *lo0 ppm, whichever is greater.
used or *2 ppm, whichever is greater, in a period of
1 hour. * Need not apply where measurements are on a "dry" basis.
Appendix 3 Annex 16 - Environmental Protection
d) Stability: better than *2 per cent of full scale of range
used or 2100 ppm, whichever is greater, in a period
of 1 hour.
e) Zero drift: less than 41 per cent of full scale of range
used or 4 0 0 ppm, whichever is greater, in a period
of 1 hour.
f ) Noise: 0.5 Hz and greater, less than +.1 per cent of
full scale of range used or +I00 ppm, whichever is
greater.
g) The effect of oxygen (0,) on the CO; analyser
response shall be checked. For a change from 0 per
cent 0, to 21 per cent O,, the response of a given
CO, concentration shall not change by more than 2
per cent of reading. If this limit cannot be met an
appropriate correction factor shall be applied.
Note.- 11 is recommended as consistent with good
practice that such correction pmcedures be adopted
in all cases.
CO and CO, Anulysers
a) Response time: shall not exceed 10 seconds 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. This 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 &"C. The option to
measure CO and CO, on a drj basis (with suitable
water traps) is allowed, in which case unheated
analysers are permissible and the interference limits
for &O 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 worhng 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
+2 per cent of the full scale value. If it does then
a calibration curve shall be prepared for
operational use.
ii) Andysers with a non-linear signal output chwicteristic,
and those that do not meet the requirements
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
1. As indicated in 5.4 of Appendix 3, the measurement
of the oxides of nitrogen concenrration shall be by the
chemiluminescent technique in which radiation emitted by the
reaction of NO and O3 iS measured. This method is not
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