Thermo Scientific MBF-700LSAO-E - Dual-Safe -80°C Chest Freezers

The Thermo Scientific™ Dual-Safe -80ºC chest freezer with its dual cooling system was developed for demanding military applications where the loss of samples is not an option. Unlike other chest freezers, should one compressor system fail, the other will maintain the operating temperature at -80ºC. In addition to sample protection, the DualSafe features a powerful refrigeration system for the cooling of high-value samples. The Dual-Safe features large storage capacity (over 32 cu. ft.), high cooling capacity (more than twice our standard chest freezers) and redundancy (two independent refrigeration systems) for critical samples.

Rapidly freeze samples in a secure environment with Thermo Scientific™ Dual-Safe -80°C Chest Freezers, which feature a redundant cascade refrigeration systems.

Control system features a digital temperature display, 6" circular chart recorder, independent refrigeration controls, a keyed master switch and indicator lights for all control and operational functions.

Control System

• Keyed master power switch for operating security 
• Independent refrigeration controls selectable for systems “A” and “B” 
• Adjustable, integrated temperature control 
• Toggle between display setpoint, actual operating temperature and alarm limits 
• Independent adjustable cold and warm alarm setpoints with key activated switch, audible warning and alarm silence options 
• Power failure alarm with battery back-up 
• Indicator lights for all control and operational functions 
• Standard 6” circular chart recorder for permanent record of cabinet performance 
• Battery meter allows for easy check of backup charge

General Performance Features

• Two independent cascade refrigeration systems configured to deliver reserve refrigeration capacity under extreme conditions 
• Four (1.5) HP air-cooled (water-cooled optional) compressors for high capacity and maximum reliability 
• Three modes of operation, including normal and accelerated pull-down, plus long-term storage 
• Redundant controls in case of controller failure

Cabinet Design

• Uses standard ultra-low temperature inventory racks with boxes 
• Coved corner interior design improves refrigeration efficiency and accelerates heat removal from stored product 
• Laboratory grade construction includes minimum 5" (12.7 cm) CFC-free foamed-inplace urethane insulation surrounding interior chamber, plus 3" (8.9 cm) insulation in lid 
• Fully insulated lid has two cam action latches which compress against multi-seal gasket to protect against frost build-up 
• High density sub-lids provide additional protection to stored product during lid openings 
• Heavy-gauge, reinforced, cold-rolled steel interior chamber has 50% greater thermal efficiency than stainless steel 
• Exterior and interior surfaces are finished with high impact powder coat paint 
• Includes 1" diameter thru-wall access port with plug 
• CE and UL approved

Refrigeration System

• Two independent cascade systems capable of operating separately or together depending on system loading 
• Thermal expansion valve increases BTU removal capacity, increases temperature pulldown rate, improves temperature recovery following lid openings and warm product insertion, and automatically reacts to changing ambient temperatures 
• Gravity feed evaporator design assures temperature uniformity within chamber interior, enhances refrigerant flow and oil return, and increases overall efficiency 
• CFC-free refrigerants