Typically,
a Franz cell consists of two separate chambers, a donor chamber
on the top and receptor chamber on the bottom, with the membrane
under test placed horizontally between the two chambers.
The donor chamber is filled with the material to be permeated
through a test membrane, and the sample is obtained from the
sampling arm in the receptor chamber. For temperature control,
the receptor chamber is surrounded by a temperature jacket with
inflow and outflow arms, which is filled with water.