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oxygen present in the sample give differing indicated
hydrocarbon concentration for constant actual HC
concentrations); and
b) the relative hydrocarbon response (whereby there is
a different response to the same sample hydrocarbon
concentrations expressed as equivalent ppmC,
deperzdent on the class or admixture of classes of
hydrocarbon compounds).
The magnitude of the effects noted above shall be
determined as follows and limited accordingly.
Oxygen response: measure the response with two blends
of propane, at approximately 500 ppmC concentration known
to a relative accuracy of &1 per cent, as follows:
1) propane in 10 + 1 per cent 02,ba lance N2
b) Resolution: better than 0.5 per cent of full scale of
range used or 0.5 ppmC, whichever is greater. 2) propane in 21 + 1 per cent 02,b alance N2
If R, and R, are the respective normalized responses then
c) Repeatubility: better than k1 per cent of full scale of (R, - R2) shall be less than per cent of R,.
range used, or +0.5 ppmC, whichever is greater.
Differential hydrooarbari response: measure the response
d) Stability: better than 42 per cent of full scale of range with four blends of different hydroc.ubons in air, at
used or +I pprnc, whichever is greater, in a period of concentrations of approximately 500 pprnC, known to a
1 hour. relative accuracy of &1 per cent, as follows:
e) Zero drift: less than k1 per cent of full scale of range a) propane in zero air
used or +0.5 ppmC, whichever is greater, in a period
of 1 hour. b) propylene in zero air
i) Noise: 0.5 Hz and greater, less than 41 per cent of C) toluene in zero air
full scale of range used or 20.5 ppmC, whichever is
greater. d) n-hexane in zero air.
2-013197 ANNEX 16 - VOLUME II
No. 3
Appendix 5 Annex 16 - Environmental Protection
If R,, R,, R, and Rd are, respectively, the normalized
responses (with respect to propane), then (R, - Rb), (R, - R,)
and (R, - Rd) shall each be less than 5 per cent of R,.
3. OPTIMIZATION OF DETECTOR
RESPONSE AND ALIGNMENT
3.1 The manufacturer's instructions for initial setting up
procedures and ancillary services and supplies required shall
be implemented, and the instrument allowed to stabilize. All
setting adjustments shall involve iterative zero checking, and
correction as necessary. Using as sample a mixture of
approximately 500 ppmC of propane in air, the response
characteristics for variations first in fuel flow and then, near
an optimum fuel flow, for variations in dilution air flow to
select its optimum shall be determined. The oxygen and
differential hydrocarbon responses shall then be determined
as indicated above.
3.2 The linearity of each 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 k2 per cent of full scale value. If it does, a
calibration curve shall be prepared for operational use.
ATTACHMENT B TO APPENDIX 5. SPECIFICATION FOR
CO AND CO, ANALYSERS
Note I.- Paragraph 5.3 of Appendix 5 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. Interferences
from gases with overlapping absorption bands may be minimized
by gas absorption filters andhr optical filters, preferably
the latter.
d) Stabiliry: better than *2 per cent of full scale of range
used or k2 ppm, whichever is greater, in a period of
1 hour.
e) Zero drift: less than 21 per cent of full scale of range
used or k2 ppm, whichever is greater, in a period of
1 hour.
f) Noise: 0.5 Hz and greater, less than tl per cent of
full scale of range used or ~1 ppm, whichever is
greater.
Note 2.- See Attachment D for information on cali- g) Interferences: to be limited with respect to indicated
bration and test gases. CO concentration as follows:
Precautions: The performance specifications indicated are I) less than 500 ppdper cent ethylene concentration
generally for analyser full scale. Errors at part scale may be
a significantly greater percentage of reading. The relevance 2) less than 2 ppdper cent C02c oncentration
and importance of such increases shall be considered when 3) less than 2 ppdper cent water vapour.*
　
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