MELNG DW-HL398 Ultra-Low Temperature Freezer
| Brand | MELNG |
|---|---|
| Origin | Anhui, China |
| Model | DW-HL398 |
| Instrument Type | Upright |
| Effective Volume | 398 L |
| Interior Dimensions (W×D×H, mm) | 440 × 696 × 1266 |
| Exterior Dimensions (W×D×H, mm) | 785 × 1041 × 1947 |
| Power Supply | 220 V / 50 Hz |
| Rated Power | 1050 W |
| Weight | 252 kg |
| Temperature Range | –10 °C to –86 °C |
Overview
The MELNG DW-HL398 Ultra-Low Temperature Freezer is an upright, high-efficiency cryogenic storage system engineered for long-term preservation of temperature-sensitive biological materials—including primary cell lines, stem cells, tissue samples, plasma, mRNA vaccines, and diagnostic reagents—at stable temperatures down to –86 °C. Designed in collaboration with the Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, the unit employs a proprietary single-stage oil-lubricated compressor refrigeration cycle using an environmentally compliant refrigerant blend—eliminating ozone-depleting substances and reducing global warming potential (GWP) in alignment with international environmental directives such as the Kigali Amendment and EU F-Gas Regulation. Its thermodynamic architecture integrates high-efficiency EBM axial fans, precision platinum resistance temperature sensors (Pt100), and a dual-layer foamed door with vacuum-insulated panel (VIP) reinforcement in the cabinet walls—achieving thermal stability of ±2 °C across the full operating range and minimizing temperature fluctuation during door openings.
Key Features
- Single-stage oil-lubricated compressor system with imported high-torque, low-noise compressor—optimized for continuous operation under laboratory load cycles.
- Vacuum-insulated panels (VIPs) integrated into side and rear walls, combined with polyurethane foam-in-place insulation (≥150 mm thickness), delivering superior thermal resistance and reducing energy consumption by up to 22% versus conventional ULT freezers of comparable volume.
- 7-inch capacitive touch LCD interface with intuitive icon-driven navigation; real-time display of setpoint, actual chamber temperature, compressor status, fan speed, and alarm history.
- Dual-lock mechanical door system with independent key sets—meets ISO 20387:2018 biobank security requirements for access control and sample integrity assurance.
- Stainless steel interior (AISI 304 grade), fully welded and electropolished—resistant to embrittlement at –86 °C and compatible with standard laboratory decontamination protocols (e.g., 70% ethanol, hydrogen peroxide vapor).
- Front-accessible condenser with washable dust filter and tool-free panel removal—enabling routine maintenance without relocating the unit or disrupting adjacent equipment.
- USB data logging port supporting CSV export of timestamped temperature, alarm events, and operational parameters (compressor run time, fan duty cycle) for audit-ready record retention.
Sample Compatibility & Compliance
The DW-HL398 accommodates standard cryogenic storage configurations including 2-inch and 5-inch rack systems (not included), cryoboxes (10×10 and 9×9 formats), and loose vials mounted on adjustable heavy-duty stainless steel shelves (load capacity: 25 kg per shelf). All internal components are validated for mechanical stability at –86 °C per ASTM F2697–21 (Standard Practice for Cryogenic Storage of Biological Materials). The unit complies with IEC 61010-1:2010 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use) and meets electromagnetic compatibility (EMC) requirements per IEC 61326-1:2020. Optional accessories—including external temperature monitoring via RS485/Modbus RTU, remote alarm relay outputs, and integration-ready dry contact interfaces—support centralized lab infrastructure management under ISO/IEC 17025:2017 and GLP-compliant environments.
Software & Data Management
The embedded microcontroller records all critical operational data at user-configurable intervals (1–60 minutes), storing up to 12 months of temperature logs internally. Exported USB files include ISO 8601 timestamps, sensor IDs, deviation flags, and event-triggered annotations (e.g., “Door Open >30 s”, “Power Interruption Detected”). For regulated laboratories, optional firmware upgrade enables 21 CFR Part 11–compliant electronic signatures, audit trail generation, and role-based user access levels (Operator, Supervisor, Administrator). Data exports are natively compatible with LIMS platforms (e.g., LabVantage, Thermo Fisher SampleManager) via standard CSV or XML schema mapping.
Applications
- Biobanking: Long-term archival storage of human biospecimens under ISBER Best Practices guidelines.
- Vaccine Development: Cold chain stabilization of mRNA-LNP formulations during preclinical evaluation and stability testing (ICH Q5C).
- Cell Therapy Manufacturing: Maintenance of master and working cell banks per USP and Ph. Eur. 5.2.12.
- Clinical Diagnostics: Preservation of reference standards, calibrators, and proficiency testing materials per CLIA and CAP requirements.
- Academic Research: Reliable low-temperature housing for CRISPR libraries, organoid cultures, and frozen section repositories.
FAQ
What is the minimum ambient temperature required for stable operation?
The unit is rated for installation in rooms maintained between +10 °C and +32 °C, with relative humidity ≤70% non-condensing. Performance validation confirms stable –86 °C operation at 32 °C ambient with adequate ventilation (≥150 mm clearance on all sides and above).
Does the freezer support validation protocols for IQ/OQ/PQ?
Yes—factory-installed NIST-traceable Pt100 sensors, documented calibration certificates, and configurable alarm thresholds enable straightforward execution of Installation Qualification (IQ), Operational Qualification (OQ), and Performance Qualification (PQ) per GAMP 5 and Annex 15.
Can the USB log data be password-protected or encrypted?
Raw USB exports are unencrypted for universal compatibility; however, when configured with the Part 11 firmware option, audit trails and exported reports are digitally signed and stored with AES-256 encryption within the system’s secure memory partition.
Is the compressor covered under extended warranty?
The imported compressor carries a standard 36-month parts-and-labor warranty; extended coverage up to 60 months is available under MELNG’s Certified Service Agreement (CSA), including annual preventive maintenance and thermodynamic performance verification.
Are external monitoring interfaces compatible with BMS systems?
RS485 Modbus RTU output supports direct integration with building management systems (BMS) and third-party environmental monitoring platforms (e.g., SensiNet, TempTrak) via standard register mapping—no proprietary gateways required.
