8.2 Test chamber air samplingAssemble the sampling line. If the sampling flow rate is determined with a calibrator, start the pump, note and record the sampling flow rate. Appropriate sampling flow rate is in the range of 50 ml/min to 200 ml/min. When sampling from an emission chamber, the sampling flow shall not exceed 80 % of the air flow rate or the chamber. Connect the sampling tube to the test chamber outlet or other sampling port of the emission test chamber, note and record the time the tube was connected. Note and record temperature and if necessary atmospheric pressure. Al the end or the sampling period, disconnect the sampling tube from the chamber sampling port, note and record the time of disconnection, repeat the sampling flow determination, and turn off the pump. Disconnect the sampling tube from the sampling line and seal both ends using screw cap fittings with PTFE ferrules.