Document ID: chunk:federal_register_of_legislation:F2011C00805:reg:3:p11
Version: federal_register_of_legislation:F2011C00805
Segment Type: reg
Provision Reference: reg 3 (pt 11/18)
Character Range: 326180–328916

emission calculation, paragraph 6. below. The ambient  temperature T of the enclosure shall not be less than 296 K and no more than 304 K during the 60-minute hot soak period.

          5.5.7.  The hydrocarbon analyser shall be zeroed and spanned immediately before the end of the 60  0.5 minute test period.

          5.5.8.  At the end of the 60  0.5 minute test period, the hydrocarbon concentration in the chamber shall be measured. The temperature and the barometric pressure are also measured. These are the final readings CHCf, Pf and Tf for the hot soak test used for the calculation in paragraph 6. below.

          5.6. Soak

          5.6.1.  The test vehicle shall be pushed or otherwise moved to the soak area without use of the engine and soaked for not less than 6 hours and not more than 36 hours between the end of the hot soak test and the start of the diurnal emission test. For at least 6 hours of this period the vehicle shall be soaked at 293  2 K (20  2C).

          5.7. Diurnal test

          5.7.1.  The test vehicle shall be exposed to one cycle of ambient temperature according to the profile specified in Appendix 2 to this annex with a maximum deviation of  2 K at any time. The average temperature deviation from the profile, calculated using the absolute value of each measured deviation, shall not exceed  1 K. Ambient temperature shall be measured at least every minute. Temperature cycling begins when time Tstart = 0, as specified in paragraph 5.7.6. below.

          5.7.2. The measuring chamber shall be purged for several minutes immediately before the test until a stable background is obtainable. The chamber mixing fan(s) shall also be switched on at this time.

          5.7.3. The test vehicle, with the engine shut off and the test vehicle windows and luggage compartment(s) opened shall be moved into the measuring chamber. The mixing fan(s) shall be adjusted in such a way as to maintain a minimum air circulation speed of 8 km/h under the fuel tank of the test vehicle.

          5.7.4. The hydrocarbon analyser shall be zeroed and spanned immediately before the test.

          5.7.5. The enclosure doors shall be closed and gas-tight sealed.

          5.7.6. Within 10 minutes of closing and sealing the doors, the hydrocarbon concentration, temperature and barometric pressure are measured to give the initial readings CHCi, Pi and Ti  for the diurnal test. This is the point where time Tstart = 0.

          5.7.7.  The hydrocarbon analyser shall be zeroed and spanned immediately before the end of the test.

          5.7.8.  The end of the emission sampling period occurs 24 hours  6 minutes after the beginning of the initial sampling, as specified in paragraph