–80˚C
–130˚C
–152˚C
Recrystallization point
Hexagonal crystal
Cubic crystal
Amorphous
ice crystal
Why Freeze to –152˚C?
Recrystallization Mechanism (Artist’s Concept)
World’s lowest –152˚C freezer
ensures stable cell and tissue
preservation
An important factor to consider when
preserving cells or tissue at ultra-low
temperatures is to prevent amorphous ice
crystals from recrystallizing within and
outside the cells. Samples that are
maintained in an ultra-low temperature
freezer at –152˚C which is far lower than the
recrystallization point (–130˚C for pure water)
can be preserved semi-permanently.
Preservation at ultra-low temperatures
maintains vitrification without crystallization
occurring inside and outside cells.
In contrast to conventional liquid nitrogen
preservation containers, freezer preservation
has numerous advantages: no sample
contamination, no sudden liquid eruptions,
as well as low operational costs.
SANYO’s MDF-1156 and 1156ATN make
long-term storage below the recrystallization
point easier and more stable than ever
before.
Built-In Temperature & Power
Failure Alarms (Lamp/Buzzer)
In case of power failure or an irregular rise in
temperature, a rechargeable battery-operat-
ed indicator lamp and alarm will be activat-
ed. A compact recording unit which auto-
matically records the inside temperature,
and a backup system with liquefied CO
2
or
N
2
which is selfactivated when a power out-
age occurs are also available separately. This
equipment helps insure that the contents
will be protected in the event of any power
failure or mechanical trouble.
For MDF-1156/1156ATN
Safety Device
Advanced Features
Alarm lamp and buzzer
Filter check lamp
Buzzer key
Alarm test key
Mode setting key
Digit shift key
Numerical value shift key
Power switch
CO
2
back-up test swich (AT type only)
CO
2
back-up swich (AT type only)
Battery switch
Temperature recorder
Control panel
Hot line
Standard casters and levelling feet
Standard-equipped heavy duty casters make
it easy to move a freezer when necessary.
The levelling feet keep a freezer level and
firm on the floor.
Self-diagnostic function
The temperature sensor, filter sensor and
cascade sensor monitor operation conditions
continuously. Should abnormality be picked
up, an error code and the current tempera-
ture will be displayed in turn.
Ring back function
The alarm buzzer can be silenced by press-
ing the BUZZER key on the control panel.
(The remote alarm signal is not cancelled.)
Should the alarm condition continue after a
certain suspension, the alarm buzzer sound
will resume.
Easy Maintenance
(MDF-193/193AT have
no filters)
Filter check lamp notifys
the user of a clogged
condenser filter.The
condenser filter is situat-
ed at the front panel to
make filter removing
and cleaning easier.
Note:
The position of the filter check lamp is shown
on the control panel (see photo shown at the
bottom of this page).
MDF-394AT
1
2
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5
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7
8
9
10
12
11
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2
3
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7
8
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10
12
11
Specially designed compressor and
cascade refrigeration system
Specially designed
for rugged ultra-low
temperature
applications in a
laboratory
environment (HFC
refrigerants only).
Micro-processor Temperature
Control with LED Digital Display
Extremely accurate, easy-to-read display.
The temperature inside the freezer can be
set and monitored easily by means of a
microprocessor temperature control with an
LED digital display. The thermostat
incorporates a platinum resistor (Pt. 100
Ω
),
precision and durability.
Integrated Cabinet Design
High-performance refrigeration system with
foamed-in-place cabinet insulation
maximizes interior temperature uniformity
and protects against fluctuating ambient
temperatures.
Hot line for secure sealing
Moisture condensation at the top edges of
the cabinet due to differences in tempera-
ture inside and out causes frost and icing
problems that may reduce heat insulation
efficiency and obstruct door movements.
These problems are prevented by the “hot
line” by means of which hot gas from the
higher temperature circuit is circulated
through the problem areas.
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