Document ID: chunk:federal_register_of_legislation:F2024C00356:reg:3:p14
Version: federal_register_of_legislation:F2024C00356
Segment Type: reg
Provision Reference: reg 3 (pt 14/18)
Character Range: 431914–434917

the requirements of paragraph 7.5. above are not met, the competent authority shall ensure that all necessary steps are taken to re-establish conformity of production as rapidly as possible.
Annex 7 - Appendix 1
  Calibration of equipment for evaporative emission testing
              1. Calibration frequency and methods
              1.1. All equipment shall be calibrated before its initial use and then calibrated as often as necessary and in any case in the month before type approval testing. The calibration methods to be used are described in this appendix.
              1.2. Normally the series of temperatures which are mentioned first shall be used. The series of temperatures within square brackets may alternatively be used.
              2. Calibration of the enclosure
              2.1. Initial determination of internal volume of the enclosure
              2.1.1. Before its initial use, the internal volume of the chamber shall be determined as follows:
               The internal dimensions of the chamber are carefully measured, allowing for any irregularities such as bracing struts. The internal volume of the chamber is determined from these measurements.
               For variable-volume enclosures, the enclosure shall 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 shall be repeatable within 0.5 per cent of the reported value.
              2.1.2. The net internal volume is determined by subtracting 1.42 m3 from the internal volume of the chamber. Alternatively the volume of the test vehicle with the luggage compartment and windows open may be used instead of the 1.42 m3.
              2.1.3. The chamber shall be checked as in paragraph 2.3. below. If the propane mass does not correspond to the injected mass to within 2 per cent, then corrective action is required.
              2.2. Determination of chamber background emissions
               This operation determines that the chamber does not contain any materials that emit significant amounts of hydrocarbons. The check shall 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.
              2.2.1. Variable-volume enclosures may be operated in either latched or unlatched volume configuration, as described in paragraph 2.1.1. above, ambient temperatures shall be maintained at 308 K 2 K. (35 2 °C) [309 K 2 K (36 2 °C)], throughout the 4-hour period mentioned below.
              2.2.2. Fixed volume enclosures shall be operated with the inlet and outlet flow streams closed. Ambient temperatures shall be maintained at 308 K 2 K
              (35 2 °C) [309 K 2 K (36 2 °C) throughout the 4-hour period mentioned below.
              2.2.3. The enclosure may be sealed and the mixing fan operated for a period of up to 12 hours before the 4-hour background sampling period