Ezi vils ze-autsampler zinoyilo lwentamo eqinisekisa ukuvalwa okukhuselekileyo, ukuthintela isampulu yokuvuza okanye ungcoliseko ngexesha lohlalutyo. I-cap yesikhafu inokutywina ngokuqinileyo kwi-vial, iqinisekisa itywina eliqinisekileyo nelivuzayo. Le ndlela yokhuseleko ekhuselekileyo iqinisekisa ukuthembeka kweesampulu ezigciniweyo ngexesha lokugcina, ukuthutha, kunye nohlalutyo.