Document ID: chunk:federal_register_of_legislation:F2012C00283:reg:3:p5
Version: federal_register_of_legislation:F2012C00283
Segment Type: reg
Provision Reference: reg 3 (pt 5/18)
Character Range: 377658–380521

end of the hot soak or diurnal emission test (including beginning and end of sampling periods along with the time elapsed between start and completion of each test).
              4.4. Fuel tank heating (only applicable for gasoline canister load option)
              4.4.1. The fuel in the vehicle tank(s) shall be heated by a controllable source of heat; for example a heating pad of 2,000 W capacity is suitable. The heating system shall apply heat evenly to the tank walls beneath the level of the fuel so as not to cause local overheating of the fuel. Heat shall not be applied to the vapour in the tank above the fuel.
              4.4.2. The tank heating device shall make it possible to heat the fuel in the tank evenly by 14 K from 289 K (16 °C) within 60 minutes, with the temperature sensor position as in paragraph 5.1.1. below. The heating system shall be capable of controlling the fuel temperature to 1.5 K of the required temperature during the tank heating process.
              4.5. Temperature recording
              4.5.1. The temperature in the chamber is recorded at two points by temperature sensors which are connected so as to show a mean value. The measuring points are extended approximately 0.1 m into the enclosure from the vertical centre line of each side wall at a height of 0.9 ±0.2 m.
              4.5.2. The temperatures of the fuel tank(s) are recorded by means of the sensor positioned in the fuel tank as in paragraph 5.1.1. below in the case of use of the gasoline canister load option (paragraph 5.1.5. below).
              4.5.3. Temperatures shall, throughout the evaporative emission measurements, be recorded or entered into a data processing system at a frequency of at least once per minute.
              4.5.4. The accuracy of the temperature recording system shall be within 1.0 K and the temperature shall be capable of being resolved to 0.4 K.
              4.5.5. The recording or data processing system shall be capable of resolving time to 15 seconds.
              4.6.  Pressure recording
              4.6.1. The difference Δp between barometric pressure within the test area and the enclosure internal pressure shall, throughout the evaporative emission measurements, be recorded or entered into a data processing system at a frequency of at least once per minute.
              4.6.2. The accuracy of the pressure recording system shall be within 2 kPa and the pressure shall be capable of being resolved to 0.2 kPa.
              4.6.3. The recording or data processing system shall be capable of resolving time to 15 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