Chest freezer MR-DF-LW series

laboratoryventilatedR134a

Product overview

• Ultra-low temperature (ULT) chest cryogenic freezer for long-term biological sample storage; available in two capacities: 128 L and 258 L.
• Setpoint range from -90°C to -135°C with 1°C control precision; digital display and built-in recording.

Control system

• Microprocessor-based controller with adjustable setpoint (-90°C to -135°C) and 1°C resolution.
• Digital temperature display and built-in temperature printer (7-day recording).
• Keyboard lock and password-protected configuration to prevent unauthorized changes.
• Delayed start and safe-stop interval to protect the refrigeration cycle during restart.
• Audible and visual alarms: high/low temperature, power failure, low battery, door open, filter blockage, system fault.
• 72-hour backup battery for controller display and printer.
• Input power: standard 380V/50Hz three-phase (adaptable to 220V 50/60Hz single-phase).

Structure / Design

• Chest-type cabinet with stainless steel interior and painted steel exterior.
• Double-seal lid and two-stage foaming insulation with 155 mm thickness for thermal stability.
• Rotatable assistant door handle and keyed top-door lock for controlled access.
• Four casters for site repositioning and maintenance access.
• Optional accessories: chart recorder, LN2 emergency back-up, storage racks and boxes, remote alarm system.

Refrigeration system

• Imported Tecumseh compressor and Germany EBM fan motor for reliable operation.
• Proprietary refrigeration circulation and unipolar compressor oil-lubrication technology.
• China-patented mixed refrigerant technology (mixtures may include R134a, R404a, R23, R410A, N2, etc.); CFC-free.
• Manufacturing and quality certifications: ISO9001, ISO14001, ISO13485.

Specifications
Model | MR-DF-LW128 | MR-DF-LW258
Temperature range | -90°C ~ -135°C | -90°C ~ -135°C
Capacity | 128 liters | 258 liters
External size (WxDxH) mm | 880 × 1590 × 1040 | 890 × 2085 × 1009
Internal size (WxDxH) mm | 370 × 600 × 550 | 410 × 1140 × 552
Control | Microprocessor | Microprocessor
Keyboard lock | Yes | Yes
Door lock | Yes | Yes
Temperature recorder | Built-in printer | Built-in printer
Alarm | Audio & Visual | Audio & Visual
Insulation thickness | 155 mm | 155 mm
Input power | 2200 W | 3000 W
Power supply | 380V/50Hz, 3 phase (changeable) | 380V/50Hz, 3 phase (changeable)
Weight (Net / Gross) | 230 / 250 kg | 300 / 320 kg

Technical specifications

• Temperature control: settable from -90°C to -135°C, control precision 1°C.
• Capacity options: 128 L (MR-DF-LW128) and 258 L (MR-DF-LW258).
• Construction: chest type with stainless steel interior.
• Display and recording: digital display and integrated printer for data recording.
• Security features: keyboard lock, password protection and multiple alarms.
• Insulation: 155 mm thickness with double sealing.
• Cooling components: Tecumseh compressor, EBM fan, patented mixed refrigerant (CFC-free).
• Power: standard 380V/50Hz 3-phase (convertible to 220V 50/60Hz 1-phase).
• Options: data recording, LN2 back-up, storage racks and boxes, remote alarm.
• Certifications: ISO9001, ISO14001, ISO13485.