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sensitive to NO, and therefore the sample shall be passed
through a converter 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.
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 be 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
necessary flow conrrol components, such as rc~ulators, a) Total range: 0 to 2 500 ppm in appropriate ranges.
valves, flowmeters, etc. ~aterkilsin contact with the sample
gas shall 'be restricted to those which are resistant to attack by b) Resolution: bitter than 0.5 per cent of full scale of
oxides of,nitrogen, such as stainless steel, glass, etc. The range used or 1 ppm, whichever is greater.
temperature of the sample shall everywhere be maintained at
values, consistent with the local pressures, which avoid c) Repeatability: better than *I per cent of full scale of
condensation of water. range used, or +1 ppm, whichever is greater.
Annex 16 - Environmental Protection Volume II
d) Stabilily: better than 5~2pe r cent of full scale of range
used or +1 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 k1 ppm, whichever is greater, in a period of
, 1 hour.
f ) Noise: 0.5 Hz and greater, less than e1.0 per cent of
full scale of range used or 21 ppm, whichever is
greater, in a period of 2 hours.
g) fntetference: suppression for samples containing CO,
and water vapour, shall be limited as follows:
- less than 0.05 per cent readin&er cent CO,
concentration;
- less than 0.1 per cent reading@ cent water
vapour concentration.
If the interference limitation(s) for CO, and/or water vapour
cannot be met, appropriate correction factors shall be
determined, reported and applied.
Note.- It is recammended as consistent with good
practice that such correction procedures be adopted in all
cases.
h) Response time: shall not exceed 10 seconds frominlet
of the sample to the analysis system to the
achievement of 90 per cent of the final reading.
i) Linearity: better than k2 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 NO, present in the sample to
NO. The converter shall not affect the NO miginally
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
Note.- The following table lists the gclres which will
cover the range of setting and calibration procedures,
described elsewhere.
Analyser Gas Accuracy*
Carbon monoxide and carbon dioxide calibration gases
may be blended singly or as dual component mixtures. Three
component mixtures of carbon monoxide, carbon dioxide and
propane in zero air may be used, provided the stability of the
mixture is assured.
HC propane in 10 21 per +1 per cent
cent 0, balance N,
HC propane in 2 1 21 per ?I per cent
cent O2 balance N,
BC propylene in zero air k1 per cent
HC toluene in xro air ? 1 per cent
HC n-hexane in zero air el per cent
HC propane in zero air +2 per cent or k0.05 ppm**
CO CO in air ?2 per cent or *2 ppm**
co2 CO, in air +2 p r cent or flOO ppm**
*OX NO in N2 22 per cent or &1 ppm**
* Taken over the 95 per cent confidence interval.
** Whichever is greater.
Zero gas as specified for the CO, CO, and HC analysers
shall be zero air (which includes "artificial" air with 20 to 22
per cent 0, blended with N,). For the NO, analyser zero
nitrogen shall be used as the zero gas. Impurities in both
kinds of zero gas shall be resbicted to be less than the
following concentrations:
1 P PC~
1 ppm CO
100 ppm CO,
1 PPm NO,
The applicant shall ensure that commercial gases supplied
to him do in fact meet this specification, or are so specified
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