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Table of calibration gases
Analyser Gas Accuracy*
HC propane in zero air +2 per cent or s0.05 ppm**
co2 C02 in zero air &2 per cent or A00 ppm*'
CO CO in zero air +2 per cent or +2 ppm**
NO, NO, in zero nitrogen *2 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.
zon/97
No. 3
Appendix 3
Table of test gases
Annex 16 - Environmental Protection
Analyser Gas Accuracy *
HC propane in 10 +1 per cenl 0, +I per cent
balance zero nitrogen
Hc propane in 21 f1 per cent O2 21 per cent
balance zero nitrogen
Hc propylene in zero air +1 per cent
HC toluene in zcro air 11 per cent
HC n-hexane in zero air f 1 per cent
HC propane in zero air fl per cent
co2 COz in zero air 21 per cent
' 3 2 C02 in zero nitrogen +I per cent
CO CO in zero air +1 pcr cent
NO, NO in zero nitrogen +1 per cent
* Taken over the 95 per cent confidence interval
The above gases are required to carry out the tests oE Attachments A, B and C.
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.
Zero gas as specified for the CO, C02 and HC analyscrs
shall be zero air (which includes "artificial" air with 20 to 22
per cent 0, blendcd with Nz) For the NO, analyser zero
nitrogen shall be used as the zero gas. Impurities in both
kids of zero gas shall be restricted to be less than the
following concenirations:
1 PPm C
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
by the vendor.
-2013197
No. 3
Annex 16 - Environmental Protection
2-0/3/97
No. 3
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Volume I1
Appendix 5 Annex I6 - Environmental Protection
El wf A
(Wf") <
(El,) 4
L k
(f) TB (TI
1 I
58
I I
a) El v Tg b) Wf v Tg
I I
I I
, - - - + - - - - - - - - - - - - - - - - - - - A
I
F A
I
F A
I
(Fool
(Fn)
h
(TI TB
El = EMISSION INDEX
TB = COMBUSTOR INLET TEMPERATURE
Wf = ENGINE FUELMASS FLOW RATE
F = ENGINE THRUST
n = ENGINE PRESSURE RATIO
Flgure 5-3. Calculation procedure
ATTACHMENT A TO APPENDIX 5. SPECIFICATION
FOR HC ANALYSER
Note I .As outlined in 5.2 of Appendix 5, the measuring
element in this analyser is the flame ionizati~nd etector (FID)
in which the whole or a representative portion of the sample
pow is admitted into a hydrogen-fuelled flame. With suitably ~ -
positioned electrodes an ioilization current can be established
which is afunction of the mass rate of hydrocarbon entering
the &me. It is this current which, referred to an appropriate
zero, is amplified arzd ranged to provide the output response
as a measure of the hydrocarbon concentration expressed as
ppmC equivalent.
Note 2.- See Attachment D for information on calibration
and test gases.
1. GENERAL
Precautions: The performance specifications indicated are
generally for analyser full scale. Errors at part scale may be
a s~gnlficantly 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.
The instrument to be used shall be such as to maintain the
temperature of the detector and sample-handling components
a1 a set point temperature within the range 155°C to 165°C to
a stability of *2"C. The leading spccification points shall be
as follows, the detector response having been optim~zcd and
the instrument generalIy having stabilized:
a) Total range: 0 to 500 ppmC in appropriate ranges.
g) 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.
h) Linearity: response with propane in air shall be linear
for each range within +2 per cent of full scale,
otherwise calibration corrections shall be used.
2. SYNERGISTIC EFFECTS
Note.- In application there are two aspects of
performance which can affect the accuracy of measurement:
a) the oxygen eflect (whereby differing proportions of
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