Sanyo manual Why Freeze to -152˚C?, For MDF-1156/1156ATN, Advanced Features, Safety Device

For MDF-1156/1156ATN

Advanced Features

Why Freeze to –152˚C?

Recrystallization Mechanism (Artist’s Concept)

Specially designed compressor and cascade refrigeration system

Self-diagnostic function

The temperature sensor, filter sensor and

–80˚C

–130˚C Recrystallization point

–152˚C

Hexagonal crystal

Cubic crystal

Amorphous ice crystal

Specially designed for rugged ultra-low temperature applications in a laboratory environment (HFC refrigerants only).

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

World’s lowest –152˚C freezer ensures stable cell and tissue

Micro-processor Temperature Control with LED Digital Display

will resume.

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.

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. 100Ω), 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.

Hot line

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).

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.

Safety Device

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 CO2 or N2 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.

Control panel

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1

2

3 4 5 6 7

9

81011

MDF-394AT

1Alarm lamp and buzzer

2Filter check lamp

3Buzzer key

4Alarm test key

5Mode setting key

6Digit shift key

7Numerical value shift key

8Power switch

9CO2 back-up test swich (AT type only)

10 CO2 back-up swich (AT type only) 11 Battery switch

12 Temperature recorder