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3.2 The linearity of cach analyser range shall be
checked by applying propane in air samples at concentrations
of approximately 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 zero) shall
not exceed 42 per cent of full scale value. If it docs, a
calibration curve shall be prepared for operational use.
ATTACHMENT B TO APPENDIX 3. SPECIFICATION FOR
CO AND CO, ANALYSERS
Note I.- Paragraph 5.3 of Appendix 3 summarizes the
characteristics of the analysis sub-system to be employed for
the individual measurements of CO and CO, concentrations
in the exhaust gas sample. The instruments are based on the
principle of non-dispersive absorption of infra-red radiation
in parallel reference and sample gas cells. The required
ranges of sensitivity are obtained by use of stacked sample
cells or changes in electronic circuitry or both. Inte$erences
from gases with overlapping absorption bands may be minimized
by gas absorptionjlters andor opticaljilters, preferably
the lattel:
e) Zero drift: lcss han +1 per cent of full scale of range
uscd or 22 ppm, whichever is greater, in a period of
1 hour.
f) Noise: 0.5 Hz and greater, lcss than 4 per cent of
full scale of range used or +1 ppm, whichcvcr is
greater.
g) Interferences: to be limited with respect to indicated
CO concentration as follows:
1) lcss than 500 ppmlpcr ccnt ethylene concentration
Note 2.- See Attachment D for information on cali- 2) less than 2 pprnlper cent C02 concentration
bration and test gases.
3) less than 2 ppmlpcr ccnt water vapout*
Precautions: The performance specifications indicated are
generally for analyser full scale. Errors at part scale may be If the interference limitation(s) for C02 and/or water vapour
a significantly greater percentage of reading. The relevance cannot be met, appropriate correction factors shall be
and importance of such increases shall be considered when determined, reported and applied.
preparing to make measurements. If better performance is
necessary, then appropriate precautions shall be taken. Note.- It is recommended as consistetzt with good
practice that such correction procedures be adopted in all
The principal performance specification shall be as
follows:
C02 Analyser
CO Amlyser a) Total range: 0 to 10 per cent in appropriate ranges.
a) Total range: 0 to 2 500 pprn in appropriate ranges. b) Resolution: better than 0.5 per ccnt of full scalc of
b) Resolution: bctkr than 0.5 per cent of full scalc d range uscd or 100 ppm, whichcvcr is greater.
rangc uscd or 1 ppm, whichcvcr is grcakr.
c) Repeatability: better than +1 per ccnt of full scale of
C) Repeatabiliry: better than 21 per ccnt of full scalc of rangc uscd or +I 00 ppm, whichever is greater.
rangc used, or ?2 ppm, whichcvcr is greater.
d) Stability: better than +2 per ccnt of full scalc of range
uscd or k2 ppm, whichever is greater, in a period of
1 hour. * Need not apply w h e m~e asurements rn on a "dry" basis.
-20n/97
No. 3
Appendix 3 Annex I6 - Environmental Protection
d) Stability: better than k2 per cent of full scale of range
used or *I00 ppm, whichever is greater, in a period
of 1 hour.
e) Zero drift: less than +I 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 21 per cent of
full scale of range used or +lo0 ppm, whichever is
greater.
g) The effect of oxygen (02)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
COT 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.- It is recommended as consistent with good
practice that such correction procedures be adopted
in all cases.
CO and C02 Analysers
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 sarnple cell and all
other components in contact with the sample in this
sub-system be maintained at a temperature bf not less
than 50°C, with a stability of k2"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
　
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