Document ID: chunk:federal_register_of_legislation:F2012C00283:reg:3:p6
Version: federal_register_of_legislation:F2012C00283
Segment Type: reg
Provision Reference: reg 3 (pt 6/18)
Character Range: 380249–383233

seconds.
              4.7. Fans
              4.7.1. By the use of one or more fans or blowers with the SHED door(s) open it shall be possible to reduce the hydrocarbons concentration in the chamber to the ambient hydrocarbon level.
              4.7.2. The chamber shall have one or more fans or blowers of like capacity 0.1 to 0.5 m3/min. with which to thoroughly mix the atmosphere in the enclosure. It shall be possible to attain an even temperature and hydrocarbon concentration in the chamber during measurements. The vehicle in the enclosure shall not be subjected to a direct stream of air from the fans or blowers.
              4.8. Gases
              4.8.1. The following pure gases shall be available for calibration and operation:
               Purified synthetic air: (purity < 1 ppm C1 equivalent,
               1 ppm CO,  400 ppm CO2,  0,1 ppm NO);
               oxygen content between 18 and 21 per cent by volume.
               Hydrocarbon analyser fuel gas: (40 2 per cent hydrogen, and balance helium with less than 1 ppm C1 equivalent hydrocarbon, less than 400 ppm CO2),
               Propane (C3H8): 99.5 per cent minimum purity.
               Butane (C4H10): 98 per cent minimum purity.
               Nitrogen (N2): 98 per cent minimum purity.
              4.8.2. Calibration and span gases shall be available containing mixtures of propane (C3H8) and purified synthetic air. The true concentrations of a calibration gas shall be within 2 per cent of the stated figures. The accuracy of the diluted gases obtained when using a gas divider shall be to within 2 per cent of the true value. The concentrations specified in Appendix 1 may also be obtained by the use of a gas divider using synthetic air as the dilutant gas.
              4.9. Additional equipment
              4.9.1. The absolute humidity in the test area shall be measurable to within 5 per cent.
              5. Test procedure
              5.1. Test preparation
              5.1.1. The vehicle is mechanically prepared before the test as follows:
               (a) The exhaust system of the vehicle shall not exhibit any leaks;
               (b) The vehicle may be steam-cleaned before the test;
               (c) In the case of use of the gasoline canister load option (paragraph 5.1.5.  below) the fuel tank of the vehicle shall be equipped with a               temperature sensor to enable the temperature to be measured at the               mid-point of the fuel in the fuel tank when filled to 40 per cent of its               capacity;
               (d) Additional fittings, adapters of devices may be fitted to the fuel  system in order to allow a complete draining of the fuel tank. For this               purpose it is not necessary to modify the shell of the tank;
               (e) The manufacturer may propose a test method in order to take into  account the loss of hydrocarbons by evaporation coming only from the               fuel system of the vehicle.