The fish load was fresh hake coming from South Africa by plane
to Frankfurt Airport. Considering the very extreme environment of
the chilled fish (because of the presence of water, salt and ice), it
was strictly necessary to protect the tag inlay presented in Fig. 1.
The first approach was to use IP65 commercial boxes (Bopla, Germany)
to protect the inlays, as shown in Fig. 3, before placing the
smart tags within the polystyrene boxes in contact with the fish
(see Fig. 4). Moreover, to carry out the humidity measurements,
and to avoid malfunctions in the electronics caused by water condensation,
it was necessary to use a SF1 filtercap (Sensirion, Switzerland),
placed in a hole on the top of the IP67 housing box that
provided protection to the SHT15 sensor. The RFID tag was placed
on a corner of the fish box to ensure a correct real-time reading of
the temperature and relative humidity measurements (maximum
reading distance of about 10 cm) from the outside without the
need of opening the fish box.