Milestone PrestoCHILL, Operator'S Manual

Page: 26 / 72

PrestoCHILL MM138-003
– Operator Manual
26
3.8. Set up freezing parameters
IN MANUAL MODE: To set up freezing temperature and duration, enter in the Chiller page, through the
“Start chiller” icon.
IN AUTOMATIC MODE: To set up freezing temperature and duration must be in the working chiller period
(pre-set in automatic cycle settings- see chapter 3.7.1) otherwise you can not access the screen below.
When you are in the screen displayed below, modify the set temperature with the right arrows (red arrow to
increase and blue arrow to decrease) or by touching the set temperature box (in this case a keypad will
appear).
Modify the set freezing time in with the lateral arrow or by touching the Time box (in this case a keypad will
appear).
3.9. Defrost
The defrost procedure allows to obtain, in a short time, the complete elimination of frost that forms during
normal PrestoCHILL use.
Defrost procedure consists of plate heating, while an aspiration removes aqueous vapors derived from frost
evaporation.
Since samples prepared in PrestoCHILL are fresh and so potentially dangerous, defrost vapors are filtered
through an HEPA12 filter (blue arrow on the picture below), which removes biological pathogens.
Then vapors condense in the cool trap, positioned in the left angle of the PrestoCHILL frontal side, yellow
arrow on the picture below.
Milestone suggests freezing samples at -40°C.
The freezing time depends on mould size used.
Refer to chapter 3.10.1.