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26 July 1993
1 1 November 1993
20 March 1997
20 March 1997
-
-2013197
No. 3
ATTACHMENT A TO APPENDIX 3. SPECIFICATION
FOR HC ANALYSER
Note 1.- As outlined in 5.2 of Appendix 3, the measuring g) Response time: shall not exceed 10 seconds from inlet
element in this analyscr is thejame ionization detector (FZD) of the sample to the analysis system, to the
in which the whole or a representative portion of the sample achievement of 90 per cent of the final reading.
jow is admitted into a hydrogett-fuelled flame. With suitably
positioned electrodes an ionization current can be established h) Linearity: response with propane in air shall be linear
which is afunction of the rnass rate of hydrocarbon entering for each range within 22 per cent of full scale,
thejame. It is this current which, referred to an appropriate otherwise calibration corrections shall be used.
zero, is amplified and ranged to provide the output response
as a mensure of the hydrocarbon concentration expressed as
ppmC equivalent. 2. SYNERGISTIC EFFECTS
Note 2.- See Attachment D for information on cali- Note.- In application there are rwo aspects of
bration and test gases. pe$ormance which can affect the accuracy of measurement:
a) the oxygen effect (whereby differing proportions of
1. GENERAL oxygen present in the sample give differing indicated
hydrocarbon concentration for constant actual HC
Precautions: The performance specifications indicated are concentrations); and
generally for analyscr full scale. Errors at part scalc may be
a significantly greater percentage of reading. The relevance b) ath ed ifrleelraetnivt er ehsypdornoscea rtob otnh er esaspmoen ssea m(wplhee rheybdyr othcaerreb oins
and importance of such increases shall be considered when concentrations expressed as equivalent ppmC,
preparing to make measurements. If better performance is dependent on the class or admixture of classes of
necessary, then appropriate precautions shall be taken. hydrocarbon compounds).
The instrument to be used shall be such as to maintain the The magnitude of the effects noted above shall be
temperature of the detector and samplc-handling components detemined as follows and limited accordingly.
at a set aoint temaeraturc within the ranpc 155'C to 165OC to ..d
a stability of k2OC. The leading specification points shall be Oxygen response: measure the response with two blends
as follows, the detector response having been optimized and of at approximately 500 p p r n ~co ncentralion known
the instrument generally having stabilized: to a relative accuracy of +1 per cent, as follows:
a) Total range: 0 to 5 000 ppmC in appropriate ranges. 1) propane in 10 + 1 per cent 0,, balance N,
b) Resolution: better than 0.5 per cent of full scalc of 2) propane in 21 * 1 per cent O,, balance N,
range used or 0.5 ppmC, whichevcr is greatcr.
If R, and Rz arc the rcspectivc normalized responses then
c) Rraenpgeea tuasbeidli,f yo:r bke0t.t5e rp tphrannC +, Iw pheicr hceevnctr oifs fgurlela stccra.l c of (R, - R,) shall be less than 3 per cent of R1.
d) Stabili~:b etter than +2 per cent of full scale of range Dijkrential hydrocarbon response: measure the response
used or k1.0 ppmC, whichever is greater, in a period with four blends of different hydrocarbons in air, at
of J hour. concentrations of approximately 500 ppmC, known to a
relativc accuracy of rl per cent, as follows:
e) Zero dr~fr: less than 41 per cent of full scale ofrange a) propane in zero air
used or +0.5 ppmC, whichever is greater, in a period
of 1 hour. b) propylenc in zero air
f) Noise: 0.5 Hz and greater, less than +I per cent of c) toluene in zero air
full scale of range used or k0.5 pprnC, whichever is
greater. d) n-hcxane in zero air.
-20M97
No. 3
ANNEX 16 - VOLUME I1 27
Annex 16 - Environmental Protection Volume XI
If R,, Rb, R, and Rd arc, respectively, the normalized
responses (with respect to propane), then (R, - Rb), (R, - R,)
and (Rn - Rd) shall cach be lcss 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.
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