Document ID: chunk:federal_register_of_legislation:F2024C00356:reg:3:p6
Version: federal_register_of_legislation:F2024C00356
Segment Type: reg
Provision Reference: reg 3 (pt 6/18)
Character Range: 410633–413558

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.
              5.1.2. The vehicle is taken into the test area where the ambient temperature is between 293 and 303 K (20 and 30 °C).
              5.1.3. The ageing of the canister(s) has to be verified. This may be done by demonstrating that it has accumulated a minimum of 3,000 km. If this demonstration is not given, the following procedure is used. In the case of a multiple canister system each canister shall undergo the procedure separately.
              5.1.3.1. The canister is removed from the vehicle. Special care shall be taken during this step to avoid damage to components and the integrity of the fuel system.
5.1.3.2. The weight of the canister shall be checked.
              5.1.3.3. The canister is connected to a fuel tank, possibly an external one, filled with reference fuel, to 40 per cent volume of the fuel tank(s).