The arrows indicate the gas flow sense: (1) wood box; (2) dilution valve; (3) control flow valve of the gas of
the permeation camera; (4) generating system of humidity; (5) metallic supports; (6) permeation tube; (7) permeation camera; (8) resistance; (9) serpentine; (10) Teflon
septum with sealing wax and aluminum; (11) SPME device; (12) sampling bulb; (13) mini fan; (14) copper tube and (15) synthetic air.