Delta-T Devices SunScan SS1 User Manual page 65

Desiccant
The SunScan probe, BF5 and BF5-RL4 transmitter module each contain
desiccant packs. The desiccant packs must be refreshed from time to time
to avoid the possibility of condensation within the instruments.
The dryness of the desiccant pack may be indicated by a coloured panel
on the instrument. Blue indicates dry, pink indicates that renewal is
needed. Otherwise it is good practice to exchange the desiccant pack for
a fresh one whenever the instrument case is opened - for example when
replacing the batteries.
Refreshing the desiccant
The desiccant pack can be regenerated by heating. Remove the pack
from the probe or BF5 and heat the pack in an oven for a few hours at
about 90ºC, then allow it to cool down away from moisture before
reinstalling it.
Technical Reference  65
SS1 User Manual v3.3