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1 hour.
f) Noise: 0.5 Hz and greater, less than k1 per cent of
full scale of range used or *1 pprn, whichever is
greater.
g) Intelferences: to be limited with respect to indicated
CO concentration as follows:
1) less than 500 ppmlper cent ethylene concentration
2) less than 2 ppm/per cent CO, concentration
3) less than 2 pprntper cent water vapow*
If the interference lirnitation(s) for CO, andlor 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
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 *l per cent of full scale of range used or 100 ppm, whichever is greater.
range used, or +2 pprn, whichever is greater.
c) Repeatability: better than *l per cent of full scale of
d) Stability: better than 22 per cent of full scale of range range used or 2100 ppm, whichever is greater.
used or rt2 ppm, whichever is greater, in a period of
1 hour. * Need not apply where mearurements are on a "dry" basis.
Annex 16 - Environmental Protection Volume 11
d) Stabilify: better than 22 per cent of full scale of range
used or 2100 ppm, whichever is greater, in a period
of 1 hour.
e) Zen, drift: less than *1 per cent of full scale of range
used or 2100 ppm, whichever is greater, in a period
of 1 hour.
F) Noise: 0.5 Hz and greater, less than *l per cent of
full scale of range used or 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 O2 lo 21 per cent 0, the response of a given C02
concentration shall not change by more than 2 per
cent of reading. If this limit cannot be met an
appropriate correcrion factor shall be applied.
Note.- It is recommended as cornistent with good
practice that such correction procedures he adopted
in all cases.
CO and CO, 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 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 t2"C. The option to
measure CO and CO, on a dry basis (with suitable
water traps) is allowed, in which case unheated
analysers are permissible and the interference limits
for q0 vapour removed, and subsequent correction
for inlet water vapour and water of combustion is
required.
:) Calibration curves:
i) Analysers with a linear signal output characteristic
shall be checked on all working ranges usjng 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 squxes 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 requirements
of linearity given above, shall have calibration
curves prepared for all working ranges using
calibration gases at laown 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
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 0, is measured. This method is not sensitive
to NO, and therefore the sample shall be passed through
a convener in which NO, 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.
temperature of the sample shall everywhere be maintained at
values, consistent with the local pressures, which avoid
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