Avantik Cryostat QS11 / QS11UV
Avantik
36 Commerce St.
Springfield NJ 07081 / USA
387 779 - English
47
3 THEORY OF OPERATION
3-1 CHAMBER COOLING, DEFROSTING
The chamber of the cryostat is cooled by a
refrigeration machine. In the rear upper area of
the microtome chamber is the evaporator
which the cold coolant flows through. Due to
the heat extraction from the microtome
chamber a cooling down to -35°C can be
achieved.
On the left side of the cooling chamber there
are 27 freezing stations to quickly freeze-on
specimens onto specimen stages.
Additionally, a Peltier element is integrated into
the fast freezing station. It can reach a surface
temperature of max. –60°C.
Use the heat extractor to accelerate the
freezing of the specimen.
The temperature of the microtome chamber
can be adjusted continuously down to -35°C.
For th
is, pre-select the desired temperature as
set
value on the operating controls.
The actual value of the microtome is constantly
measured and sent to the control unit which
causes the refrigeration to switch on and off.
Inevitably, when working on the microtome the
dry cold air of the microtome chamber mixes
with the warm humid air outside the chamber.
Frost forms on the finned evaporator. The
increasing thickness of the frost reduces the
efficiency of the evaporator. For this reason,
the daily defrosting of the evaporator becomes
necessary.
Set the time of the daily defrosting on the
operating controls. The period of the defrosting
takes approx. 30 min. and varies according to
the thickness of the frost.
Possible frost built-up on the microtome or on
the knife carrier are not removed by defrosting
the instrument. However,
the frost recedes
after
defrosting as now the evaporator is fully
efficient again.
To avoid condensation the sliding window is
heated.
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