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temperature of the sample shall everywhere be maintained at
values, consistent with the local pressures, whlch avoid
coiiderisation of water.
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
2OBD7
No. 3
Appendix 5 Annex I6 - Environmental Protection
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:
a) Total range: 0 to 2 500 ppm in appropriate ranges.
b) Resolution: better than 0.5 per cent of full scale of
range used or 1 ppm, whichever is greater.
c) Repeatability: better than +1 per cent of full scale of
range used, or k1 pprn, whichever is greater.
d) Stability: better than +2 per cent of full scale of range
used or k1 ppm, whichever is greater, in a period of
1 hour.
e) Zero drift: less than k1 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 k1.0 per cent of
full scale of range used or +1 pprn, whichever is
greater, in a period of 2 hours.
g) Zntelference: suppression for samples containing C02
and water vapour, shall be limited as follows:
- less than 0.05 per cent readingfper cent CO,
concentration;
- less than 0.1 per cent readinglper cent water
vapour concentciation.
If the interference limitation(s) for C02 andfor 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 he adopted in all cases.
h) 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.
i) Linearity: better than +2 per cent of full scale of
range used or 22 ppm, whichever is greater.
j ) Converter: this shall be designed and operated in such
a matter as to reduce NO2 present in the sample to
NO. The converter shall not affect the NO originally
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 5. CALIBRATION AND TEST GASES
Table of calibration gases
Analyser Gas Accuracy *
HC propane in zero air k2 per cent or e0.05 ppm**
co2 C02 in zero air k2 per cent or 2100 ppm**
CO CO in zero air &2 per cent or +2 ppm**
NO, NO, in zero nitrogen 22 per cent or &1 ppm**
* Taken over the 95 per cent confidence interval
** Whichever is greater.
The above gases are required to carry out the routine calibration of
analysers during normal operational use.
-2MD7
No. 3
Annex 16 - Environmental Protection Volume I1
Table of test gases
Anulyser Gas Accuracy*
HC propane in 10 21 per cent 0, k1 per cent
balance zero nitrogen
HC propane in 21 +1 per cent 0, +1 per cent
balance zero nitrogen
HC propylene in zero air +1 per cent
HC toluene in zero air +1 per cent
HC n-hexane in zero air ~1 per cent
HC propane in zero air ~1 per cent
co2 C0, in zero air 21 per cent
co2 CO, in zero nitrogen k1 per cent
CO CO in zero air 21 per cent
NOX NO in zero nitrogen el per cent
* Taken over the 95 per cent confidence interval.
The above gases are required to carry out the tests of Attachments A, B and C.
Carbon monoxide and carbon dioxide calibration gases kinds of zero gas shall be restricted lo be less than the
may be blended singly or as dual component mixtures. Three following concentrations:
component mixtures of carbon monoxide, carbon dioxide and
propane in zero air may be used, provided the stability of the 1 PPm (l
mixture is assured. 1 ppm CO
100 ppm CO, -
Zero gas as specified for the CO, CO, and HC analysers
1 PPm NO,
shall be zcro air (which includes "artificial" air with 20 to 22 The applicant shall ensure that commercial gases supplied
per cent 0, blended with N2). For the NOx analyser zero to him do in fact meet this specification, or are so specified
nitrogen shall be used as the zero gas. Impurities in both by the vendor.
-2W3197
No. 3
Appendix 5 Annex 16 - Environmental Protection
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