The TwinGuard MDF-DU502VX -86°C Ultra Low Temperature Freezer satisfies an industry demand for safe, long-term storage for the most high-valued materials. 2 INDEPENDENT REFRIGERATION SYSTEM , combined with optional liquid nitrogen or liquid CO2 back-up systems, offer a circle of protection unmatched in the marketplace. With two independent refrigeration systems TwinGuard freezers maintain a reliable and uniform -86ºC ultra low temperature environment. Should one cooling system suffer an unexpected failure, the other circuit will keep irreplaceable samples safely around -70ºC until service can be arranged.

Dual Cooling System (TwinGuard ULT Freezer)

The two independent refrigeration systems in the TwinGuard range ULT freezers, with CoolSafe compressors, provide a reliable and exceptionally stable -86˚C ultra-low temperature environment.

In the case of an unexpected failure of one cooling circuit, the other circuit will maintain the freezer in the -70˚C range, protecting samples until service can be arranged.

The dual cooling technology differs significantly from conventional cascade refrigeration technology in fundamental design and operation. In dual cooling systems, two independent refrigeration systems provide a reliable -86ºC ultra-low temperature environment. Should an unexpected failure occur in one cooling circuit, the other can maintain the freezer in the -70ºC range until service can be arranged. This level of ultra-low temperature back-up cannot be achieved by conventional cascade systems.

Ultimate Sample Protection

The Dual Cooling System offers the highest level of protection through the use of two independent refrigeration systems. If one system unexpectedly fails the other can maintain the freezer in the -70°C range. Securely store valuable and irreplaceable samples with the upmost confidence that they won’t be lost in the case of compressor failure.

Efficient Sample Storage

The combination of VIP PLUS vacuum insulation and an enhanced cabinet design with insulated outer door, ensures optimum temperature uniformity, while the reduced wall thickness maximizes storage capacity.

Flexible shelf layout

Multiple shelf configurations allow a variety of storage options. Organize your samples by transferring your current inventory racks.

Intelligent Interface

The EZlatch makes access to stored samples even easier. A colour LCD touch panel allows full user control, even with gloved hands, while the USB port makes transferring logged data to a PC convenient. Significantly extended time to react to any sudden mechanical failures and data logging are ideal for high security applications such as pathogenic research.



  • Extreme secure Dual Cooling System
  • VIP PLUS insulation
  • Flexible shelf layout
  • Intelligent Interface
  • Innovative Cabinet Design
  • Dual Cooling System
  • EZlatch
  • LCD Touch screen
  • USB port
  • Eco Mode Operation



External Dimensions (W x D x H)790 x 882 x 1993 mm
Internal Dimensions (W x D x H)630 x 600 x 1400 mm
Volume528 litres
Net Weight285 kg
Capacity (Aluminium Racks 2” Boxes)384 (2” boxes)
Capacity (Stainless Steel Racks 2” Boxe)
Cooling Performance-86 °C
Temperature Setting Range-50 to -90 °C
Temperature Control Range-50 to -86 °C
ControllerMicroprocessor, non-volatile memory
DisplayLCD Touch Screen
Temperature SensorPt-1000
Refrigeration SystemIndependent Dual-Cooling
Compressors2 x 1100 W
Insulation MaterialPUF / VIP Plus
Insulation Thickness80 mm
Exterior MaterialPainted Steel
Interior MaterialPainted Steel
Outer Doors/Lid1
Outer Door LockY
Inner Doors/Lid2
Max. Load – Per Shelf50 kg
Max. Load – Total415 kg
Vacuum Release Port2 (1 automatic, 1 manual)
Access Port3
Access Port Positionback x 1, bottom x 2
Access Port Diameter17
Casters4 (2 leveling feet)
Power FailureV-B-R
High TemperatureV-B-R
Low TemperatureV-B-R
FilterFilterless design
Door OpenV-B
Power SupplyLocal
Noise Level52 dB [A]