Memmert ULT1000eco ULT freezer, ultra-low-temperature freezer

The Memmert ULT1000eco ULT freezer represents the cutting edge of technology and the largest capacity segment in the field of cryogenic system solutions for the long-term preservation of highly sensitive samples. In biobanks, pharmaceutical production facilities and large-scale research institutions, uncompromising temperature uniformity within large containers is the critical factor for the biological and structural integrity of samples. With an exceptional capacity of 966 litres, this system offers sufficient space for large-scale storage processes within a temperature range of -50 °C to -86 °C. Thanks to its strict focus on an energy-optimised operating concept, the ULT1000eco combines maximum storage density with minimal operating costs, thereby fully meeting the stringent criteria for sustainable and validated processes under GLP and GMP conditions.

Cascade cooling and inverter-controlled compressor operation

The thermal management of this large-capacity cryogenic cabinet is based on a highly advanced cascade cooling system, which is operated by two inverter-controlled high-performance compressors. To provide the enormous cooling capacity required for an internal volume of almost 1,000 litres in an environmentally friendly manner, the system utilises the natural refrigerants R290 and R170. The integrated inverter technology controls the compressor speed dynamically and continuously in real time. In the event of significant load changes – for example, following a prolonged sample withdrawal – the unit immediately mobilises its maximum kinetic cooling capacity to stabilise the target temperature again using the pull-down method. During normal, continuous operation in a closed system, the system switches to a highly efficient partial-load mode. This not only reduces the thermal and mechanical stress on the system components to a physical minimum, but also significantly lowers the laboratory’s carbon footprint and energy consumption.

Material-science barrier function and ergonomics

The physical boundary of the system is defined by a highly resistant housing made of textured stainless steel and a solid interior made of pure stainless steel. This material-science specification guarantees maximum resistance to abrasive cleaning processes and prevents corrosion during continuous operation. To prevent convective heat transfer when the insulated stainless steel outer door is opened, the interior is divided into four precisely segmented sections, which are further shielded by two separate stainless steel inner doors. A mechanical door lock provides physical access protection for the sample load. Once the outer door is closed, an integrated pressure relief vent with a diameter of 26 mm ensures rapid equalisation of the internal vacuum, so that the door can be reopened immediately at any time. With a maximum load capacity of 220 kg per shelf and a total load capacity of 440 kg, the mechanical structure is optimally designed to accommodate up to 770 standard 50 mm cryoboxes.

Cyber security and Lab 4.0 documentation

To ensure seamless monitoring as part of quality management, the ULT1000eco features an intuitive communication centre in the form of an ergonomically positioned 7-inch touchscreen in the outer door. Metrological data acquisition is carried out via calibratable Pt1000 temperature sensors, which provide a setting accuracy of 0.1 °C. The integrated safety concept protects the samples through visual and audible alarm systems, as well as continuous door-open detection. A high-performance backup battery ensures that alarm and data-logging functions are fully maintained in the event of a total power failure. Thanks to modern connectivity via Ethernet LAN and USB interfaces, the system can be seamlessly integrated into higher-level Laboratory Information Management Systems (LIMS) for digital remote monitoring and complete cold chain documentation.

Technical details

Thermodynamics & Refrigeration Technology

• Cooling system: Cascade configuration with two inverter compressors
• Compressor control: Inverter-controlled for maximum energy efficiency
• Refrigerant, stage 1: R290 (natural refrigerant)
• Refrigerant Stage 2: R170 (natural refrigerant)
• Condenser: Air-cooled
• Temperature range: -50 °C to -86 °C

Metrology & Control Technology

• Control unit: Ergonomic 7-inch touchscreen, integrated directly into the outer door
• Setting accuracy: 0.1 °C
• Temperature sensor: Pt1000
• Interfaces: Ethernet LAN, USB
• Safety features: Visual and audible alarm, integrated door-open detection
• Power failure protection: Backup battery for continuous alarm and monitoring

Construction & dimensions

• Internal volume: 966 litres
• Internal dimensions (W x H x D): 1035 x 1276 x 732 mm
• Casing dimensions (W x H x D): 1285 x 1992 x 973 mm
• Housing material: Robust textured stainless steel
• Interior material: Pure, easy-to-clean stainless steel
• Max. load per unit: 440 kg
• Max. load per shelf: 220 kg
• Maximum capacity (50 mm boxes): 770 units

Infrastructure & Logistics

• Door construction: Insulated stainless steel outer door with mechanical lock
• Pressure equalisation: Side feed-through / pressure relief opening with a diameter of 26 mm
• Installation: Mobile and lockable on sturdy swivel castors
• Net weight: 425 kg
• Gross weight (including packaging): 590 kg
• HS code: 8418 69 00
• Certifications: CE-approved

Contents of delivery

• 1 x Memmert ULT1000eco ULT freezer base unit
• 2 x stainless steel internal doors for thermal segmentation
• 3 x stainless steel shelves (height-adjustable)
• 1 x Integrated backup battery for power failure protection
• 1 x Integrated castor unit (movable and lockable)
• 1 x operating instructions

Important note: Storage racks and cryoboxes for the systematic storage of samples inside the chamber are not included as standard and must be configured to suit the specific application.

Customised requirements & accessories

To organise the enormous 966-litre capacity of the Memmert ULT1000eco ultra-low temperature freezer systematically and minimise thermal losses when accessing samples, we recommend fitting it with precisely dimensioned stainless steel pull-out racks. The system accommodates up to 770 standard 50 mm boxes. Due to the high load capacity of up to 220 kg per drawer, care must be taken to ensure even loading in order to reduce the strain on the drawer runners. For demanding GMP- and FDA-regulated processes, we are happy to carry out manufacturer-compliant qualification (IQ/OQ) directly at your site. Please use our procurement service to configure your individual cryogenic infrastructure.