Meling Biomedical DW-HL50 −40°C to −86°C Undercounter Ultra-Low Temperature Freezer 50 L

The Meling Biomedical DW-HL50 is a compact 50 L ultra-low temperature freezer designed for long-term storage of temperature-sensitive biological materials between −40°C and −86°C. Its undercounter cabinet combines a stainless-steel interior, insulated inner door, microprocessor temperature control, mixed-refrigerant refrigeration system, local USB temperature logging, comprehensive alarm protection, and secure solid-door construction. The compact configuration is suitable for laboratories, research facilities, biobanks, clinical environments, and other professional facilities requiring dedicated ultra-low temperature storage close to the point of use.

Certifications

• UL certified for applicable United States safety requirements

• cUL certified for applicable Canadian safety requirements

• CE marked for conformity with applicable European requirements

The microprocessor controller provides continuous digital temperature monitoring with readings displayed in 0.1°C increments. A direct-cooling, mixed-refrigerant refrigeration system supports operation down to −86°C, while manual defrost, substantial cabinet insulation, and an insulated inner door help reduce heat entry and maintain ultra-low temperature conditions during routine storage.

Key Features

• 50 L ultra-low temperature storage capacity

• Adjustable operating range from −40°C to −86°C

• Compact undercounter configuration

• Microprocessor temperature controller

• Digital display with 0.1°C temperature increments

• Direct-cooling refrigeration system

• Mixed-refrigerant system

• Manual defrost

• Single-compressor refrigeration design

• Stainless-steel interior

• One stainless-steel storage shelf

• Insulated inner door for additional thermal protection

• Solid insulated exterior door

• Ergonomic door handle

• Secure mechanical door lock

• Built-in USB temperature data logger

• Local storage for up to 100,000 temperature records

• RS485 communication interface

• Remote alarm contact

• Backup battery for continued local monitoring and alarm operation

• Optional CO₂ backup system for additional sample protection

• 25 mm access port for an independent probe or compatible monitoring equipment

• Circuit breaker for electrical protection

• Four heavy-duty casters for positioning and relocation

Temperature Performance

Manufacturer internal testing reports:

• Pull-down time to −80°C of approximately 1.63 hours

• Temperature recovery time of approximately 0.24 hours after the door has been opened for one minute

• Cabinet insulation measuring up to approximately 110 mm, depending on the cabinet surface

These figures are based on manufacturer internal testing with the freezer set to −80°C and operated at an ambient temperature of 25°C. Actual performance may vary depending on cabinet loading, ambient conditions, installation, ventilation, initial product temperature, power supply, and door-opening frequency.

Comprehensive Alarm Protection

The integrated alarm system provides visual and audible notification for conditions including:

• High cabinet temperature

• Low cabinet temperature

• High ambient temperature

• High condenser temperature

• Power failure

• Low backup-battery level

• Temperature-sensor error

• Backup-battery power-detection failure

• Door-ajar condition

• Local data-communication failure

These alarms help personnel identify temperature excursions, electrical interruptions, open-door conditions, refrigeration-system conditions, and monitoring faults promptly.

Local Temperature Data Management

The built-in data logger records cabinet temperature locally at ten-minute intervals and can retain up to 100,000 temperature records. Authorized users can export stored records directly through the USB port for documentation, audits, quality-control procedures, and local recordkeeping.

The RS485 interface and remote alarm contact can connect the freezer to compatible on-site alarm panels, monitoring equipment, or building-management systems without requiring an internet connection.

Privacy-Focused Offline Operation

Internet connectivity, cloud communication, and external manufacturer-server data collection are disabled to support institutional privacy, cybersecurity, and data-governance requirements.

Temperature records remain stored locally within the freezer and can be accessed or exported directly through the built-in USB data logger. RS485 communication and remote alarm-contact functionality remain available for compatible on-site systems.

Designed for Space-Conscious Facilities

The DW-HL50 provides true −86°C storage capability in a compact cabinet measuring approximately 757 mm high. Its undercounter format allows laboratories to place dedicated ultra-low temperature storage near workstations, testing areas, or frequently accessed sample collections without installing a full-height ULT freezer.

The insulated inner door helps reduce heat entry when the exterior door is opened, while the stainless-steel interior, secure lock, local data logger, backup battery, comprehensive alarms, mixed-refrigerant refrigeration system, and optional CO₂ backup system support professional long-term sample-storage workflows.

Main Specifications

• Model: DW-HL50

• Product type: Undercounter ultra-low temperature freezer

• Capacity: 50 L

• Temperature range: −40°C to −86°C

• Cooling performance: −86°C

• Recommended ambient temperature: 16°C to 32°C

• Climate class: N

• Controller: Microprocessor

• Display: Digital temperature display

• Display resolution: 0.1°C increments

• Cooling method: Direct cooling

• Defrost method: Manual

• Compressor: One

• Refrigerant: Mixed refrigerant

• Insulation thickness: Approximately 76 mm at the door and approximately 110–111 mm at the side walls and rear

• Exterior material: Cold-rolled steel

• Interior material: Stainless steel

• Storage configuration: One stainless-steel shelf

• Inner-door configuration: Insulated inner door

• Access port: One, 25 mm in diameter

• Mobility: Four heavy-duty casters

• Data-recording interval: Every 10 minutes

• Data-storage capacity: Up to 100,000 records

• Data export: USB

• Communication interfaces: RS485 and remote alarm contact

• Backup battery: Included

• CO₂ backup system: Optional

• Internal dimensions, W × D × H: 305 × 425 × 430 mm

• External dimensions, W × D × H: 951 × 700 × 757 mm

• Packaged dimensions, W × D × H: 1,045 × 770 × 932 mm

• Net weight, 110 V version: 96 kg

• Gross weight, 110 V version: 116 kg

• North American electrical supply: 110 V, 60 Hz

• Rated current at 110 V: 10 A