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Version Superseded: 02/01/2013
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Textual Amendments
For variable-volume enclosures, the enclosure must be latched to a fixed volume when the enclosure is held at an ambient temperature of 303 °K (30 °C) [(302 °K (29 °C)]. This nominal volume must be repeatable within ± 0,5 % of the reported value.
This operation determines that the chamber does not contain any materials that emit significant amounts of hydrocarbons. The check must be carried out at the enclosure's introduction to service, after any operations in the enclosure which may affect background emissions and at a frequency of at least once per year.
The calibration and hydrocarbon retention test in the chamber provides a check on the calculated volume in 2.1 and also measures any leak rate. The enclosure leak rate must be determined at the enclosure's introduction to service, after any operations in the enclosure which may affect the integrity of the enclosure, and at least monthly thereafter. If six consecutive monthly retention checks are successfully completed without corrective action, the enclosure leak rate may be determined quarterly thereafter as long as no corrective action is required.
The calculation of net hydrocarbon mass change within the enclosure is used to determine the chamber's hydrocarbon background and leak rate. Initial and final readings of hydrocarbon concentration, temperature and barometric pressure are used in the following formula to calculate the mass change.
where:
=
hydrocarbon mass in grams
=
mass of hydrocarbon exiting the enclosure, in the case of fixed-volume enclosures for diurnal emission testing (grams)
=
mass of hydrocarbon entering the enclosure, in the case of fixed volume enclosures for diurnal emission testing (grams)
=
hydrocarbon concentration in the enclosure (ppm carbon (NB: ppm carbon = ppm propane × 3))
=
enclosure volume in cubic metres as measured in section 2.1.1.
=
ambient temperature in the enclosure in K,
=
barometric pressure in kPa,
=
17,6;
where:
is the initial reading.
is the final reading]
The FID must be adjusted as specified by the instrument manufacturer. Propane in air should be used to optimize the response on the most common operating range.
The analyzer should be calibrated using propane in air and purified synthetic air. See section 4.5.2 of Annex III (Calibration and span gases).
Establish a calibration curve as described in sections 4.1 to 4.5 of this Appendix.
The response factor (Rf) for a particular hydrocarbon species is the ratio of the FID C 1 reading to the gas cylinder concentration, expressed as ppm C 1 .
The concentration of the test gas must be at a level to give a response of approximately 80 % of full scale deflection, for the operating range. The concentration must be known, to an accuracy of ± 2 % in reference to a gravimetric standard expressed in volume. In addition the gas cylinder must be preconditioned for 24 hours at a temperature between 293 K and 303 K (20 ° and 30 °C).
Response factors should be determined when introducing an analyzer into service and thereafter at major service intervals. The reference gas to be used is propane with balance purified air which is taken to give a response factor of 1,00.
The test gas to be used for oxygen interference and the recommended response factor range are given below:
Propane and nitrogen 0,95 ≤ Rf ≤ 1,05.
Each of the normally used operating ranges are calibrated by the following procedure:
date of calibration,
span and zero potentiometer readings (where applicable),
nominal scale,
reference data of each calibration gas used,
the actual and indicated value of each calibration gas used together with the percentage differences,
FID fuel and type,
FID air pressure.
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