Sequence 2
Sequence 2 begins immediately, with its two sampling modes. The first leaves the pump unit inactive (until approximately To+23 min 30 s), so that sampling is by direct impaction. The second turns the pump unit, so that sampling is mainly by filtration.
Once the pump is switched off, the filter is retracted and the oven gate is closed. Retraction and oven closing is accomplished in only 13 s in order to avoid any evaporation of certain condensates in the aerosols. The whole of sequence 2 takes about 55 min.
Back to previous page