Meling Biomedical DW-HL780 −40°C to −86°C Dual-Cooling Upright Ultra-Low Temperature Freezer 780 L

The Meling Biomedical DW-HL780 is a 780 L upright ultra-low temperature freezer engineered for long-term storage of temperature-sensitive biological materials between −40°C and −86°C. Its dual-cooling architecture uses two independent inverter-driven refrigeration systems to provide an additional level of protection for critical sample collections. A 10-inch intelligent touchscreen, stainless-steel interior, vacuum-insulated cabinet construction, biometric access control, local temperature data logging, and comprehensive alarm protection support demanding workflows in biobanks, hospitals, pharmaceutical facilities, research laboratories, and other professional environments.

Certifications

• CE marked for applicable European requirements

• MDR certified for applicable European medical-device requirements

• CE 61010 compliant — conforms to IEC/EN 61010 safety requirements for electrical equipment used in laboratory, measurement, and control applications

• UL certified for applicable United States safety requirements

• cUL certified for applicable Canadian safety requirements

The microprocessor controller and 10-inch HD intelligent touchscreen provide clear access to cabinet temperature, system status, alarm conditions, and stored records. Two independent inverter-driven compressors regulate refrigeration output according to system demand, while direct cooling, hydrocarbon refrigerants, vacuum-insulated panels, and substantial cabinet insulation support controlled operation down to −86°C.

Key Features

• 780 L / 27.5 cu. ft. storage capacity

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

• Two independent refrigeration systems

• Two inverter-driven compressors

• Redundant dual-cooling architecture for enhanced sample protection

• 10-inch HD intelligent touchscreen

• Microprocessor temperature controller

• Direct-cooling refrigeration system

• Manual defrost

• Hydrocarbon refrigerants

• Vacuum-insulated panel construction

• Stainless-steel interior

• Three stainless-steel shelves

• Insulated inner doors to reduce heat entry during routine access

• Ergonomic door handle

• Card and fingerprint access control

• Heated vacuum-relief port to assist with door reopening

• Built-in USB temperature data logger

• Temperature recording every five minutes

• Local record retention for up to ten years

• RS485 communication interface

• Remote alarm contact

• Backup battery for continued local monitoring and alarm operation

• Three 25 mm access ports for independent probes or compatible monitoring equipment

• Circuit breaker for electrical protection

• Four heavy-duty casters and two leveling feet

• Specified capacity for up to 24 freezer racks and 600 standard storage boxes

Temperature Performance

The DW-HL780 is built around two independent refrigeration systems. The manufacturer states that if one refrigeration system becomes unavailable, the remaining system can continue maintaining the cabinet at approximately −80°C under specified operating conditions.

Manufacturer internal testing also reports:

• Temperature recovery of approximately 40 minutes after the door has been opened for one minute

• Pull-down time to −80°C of approximately 280 minutes

• Daily energy consumption of approximately 8.5 kWh

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, voltage, initial product temperature, door-opening frequency, and individual unit configuration.

The redundant refrigeration design provides additional response time and sample protection compared with a conventional single-system freezer. Independent facility monitoring and an established emergency-transfer plan should still be maintained for critical or irreplaceable materials.

Comprehensive Alarm Protection

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

• High cabinet temperature

• Low cabinet temperature

• High ambient temperature

• Power failure

• Low backup-battery level

• Temperature-sensor error

• Backup-battery power-detection failure

• Local data-communication failure

• Door-ajar condition

• A/B refrigeration-system fault

These alarms help personnel identify temperature excursions, power interruptions, prolonged door openings, refrigeration-system faults, and monitoring-system conditions promptly.

Local Temperature Data Management

The integrated data logger records cabinet temperature locally at five-minute intervals and supports retention of up to ten years of historical records. Authorized users can export stored information directly through the USB port for audits, quality-control procedures, documentation, and local recordkeeping.

The RS485 interface and remote alarm contact can connect the freezer to compatible on-site monitoring equipment, alarm panels, 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 and alarm records remain stored locally within the freezer and can be accessed or exported directly through the integrated USB data logger. RS485 communication and remote alarm-contact functionality remain available for compatible on-site systems.

Designed for High-Volume, High-Value Storage

The DW-HL780 accommodates a specified configuration of up to 24 freezer racks and approximately 600 standard storage boxes. Its three-shelf stainless-steel interior and insulated inner-door arrangement divide the cabinet into organized storage zones while reducing exposure of materials that are not being accessed.

Card and fingerprint access control help restrict cabinet access to authorized personnel. The combination of two independent cooling systems, inverter-driven compressors, touchscreen control, local temperature documentation, vacuum insulation, comprehensive alarms, and secure cabinet construction makes the freezer suitable for facilities managing large, valuable, or difficult-to-replace biological collections.

Main Specifications

• Model: DW-HL780

• Product type: Dual-cooling upright ultra-low temperature freezer

• Capacity: 780 L / 27.5 cu. ft.

• 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: 10-inch HD intelligent touchscreen

• Compressors: Two inverter-driven compressors

• Refrigeration systems: Two independent systems

• Cooling method: Direct cooling

• Defrost method: Manual

• Refrigerant: Hydrocarbon refrigerants

• Insulation: Vacuum-insulated panels with supplementary cabinet insulation

• Insulation thickness: Approximately 100 mm at the door and 130 mm at the side walls and rear

• Exterior material: Cold-rolled steel

• Interior material: Stainless steel

• Shelves: Three stainless-steel shelves

• Inner-door configuration: Insulated inner doors

• Access control: Card and fingerprint access

• Vacuum relief: Heated vacuum-relief port

• Access ports: Three, each 25 mm in diameter

• Mobility: Four heavy-duty casters and two leveling feet

• Data-recording interval: Every five minutes

• Local record retention: Up to ten years

• Data export: USB

• Communication interfaces: RS485 and remote alarm contact

• Backup battery: Included

• Specified rack model: ZKL304-552B-CT

• Specified rack capacity: 24 racks

• Specified box capacity: Up to 600 boxes

• Internal dimensions, W × D × H: 865 × 696 × 1,286 mm

• External dimensions, W × D × H: 1,205 × 1,025 × 1,955 mm

• Packaged dimensions, W × D × H: 1,285 × 1,145 × 2,127 mm

• Net weight: 331 kg

• Gross weight with paper packaging: 393 kg

• Gross weight with wooden packaging: 425 kg

• Electrical supply: 110–230 V, 50/60 Hz

• Rated current: 14.83 A