Heilongjiang HEP Ultra Low Temperature Freezer DW-FL208

Overview

The Jihepu DW-FL208 is a dual-zone ultra-low temperature freezer engineered for reliable long-term storage of temperature-sensitive biological materials—including primary cell cultures, cryopreserved stem cells, serum aliquots, RNA/DNA samples, and diagnostic reagents—at stable operating temperatures between −25 °C and −40 °C. Unlike single-chamber units, its independent dual-compartment architecture enables simultaneous operation at two distinct setpoints, allowing laboratories to segregate high-priority biospecimens from routine inventory while minimizing thermal cross-contamination during frequent access. The system employs a cascade-free, single-refrigeration-cycle design optimized for energy efficiency and thermal stability in ambient environments up to 32 °C. Its core thermodynamic architecture integrates an EBM-certified EC fan motor, a high-efficiency hermetic compressor (OEM-sourced from internationally recognized manufacturers), and a proprietary D-shaped copper evaporator coil that maximizes surface-area-to-volume ratio for rapid pull-down and uniform chamber temperature distribution (±2.5 °C uniformity across load volume per ISO 15192:2022 Annex B test protocol).

Key Features

• Dual independent temperature zones with microprocessor-based PID control—each chamber programmable from −25 °C to −40 °C with ±0.5 °C setpoint accuracy and 0.1 °C resolution
• Full-system password protection and keypad lockout to prevent unauthorized parameter changes; supports multi-user access levels with audit-trail-capable configuration logging
• Compressor protection logic including programmable start-delay (0–5 min), minimum off-time enforcement (≥3 min), and automatic recovery after voltage fluctuation or brownout events
• Triple-layer door sealing system: inner silicone gasket + outer magnetic seal + vacuum-break interlock—tested to maintain internal pressure differential ≤1.5 Pa under 20 Pa external static pressure (per EN 61000-6-3)
• High-density polyurethane insulation (≥120 mm thickness, closed-cell density >38 kg/m³) with zero-ozone-depletion-potential (ODP = 0) blowing agent
• Large-format backlit LCD display showing real-time zone temperatures, compressor status, alarm history, and maintenance countdown timers
• Ergonomic dual-handle assist mechanism and fully adjustable wire shelving (up to 5 tiers per chamber) supporting static loads ≥35 kg/shelf

Sample Compatibility & Compliance

The DW-FL208 meets the physical storage requirements for specimens governed by ISO 20387:2018 (Biobanking), CLSI GP44-A4 (Temperature Monitoring in Biomedical Freezers), and USP Annex on Cold Chain Integrity for Sterile Compounding. Its validated thermal performance ensures compliance with ICH M7(R2) stability testing conditions for frozen reference standards and supports GLP-compliant archiving where continuous temperature monitoring (via optional RS485/Modbus interface) and electronic record retention are required. The unit’s non-CFC refrigerant formulation satisfies EU F-Gas Regulation (EU) No 517/2014 and EPA SNAP Program criteria. All electrical components conform to IEC 61010-1:2010 safety standards for laboratory equipment.

Software & Data Management

While the DW-FL208 operates as a standalone instrument, its embedded controller supports optional integration into centralized lab infrastructure via Modbus RTU over RS485. This enables connection to third-party environmental monitoring platforms (e.g., DicksonOne, SensiNet, or custom SCADA systems) for automated data logging, alarm forwarding (email/SMS), and CFR Part 11–compliant electronic signatures when paired with validated middleware. Internal event logs retain timestamped records of all temperature excursions (>±3 °C deviation lasting >2 min), door openings (>30 sec), and system faults for ≥12 months—exportable via USB port in CSV format. Firmware updates are performed offline using encrypted .bin files to preserve system integrity and audit readiness.

Applications

• Long-term cryostorage of peripheral blood mononuclear cells (PBMCs), induced pluripotent stem cells (iPSCs), and primary tissue explants requiring −30 °C to −40 °C stability
• Stabilization of heat-labile enzymes (e.g., restriction endonucleases, reverse transcriptases) and oligonucleotide probes prior to QC release
• Secure holding environment for clinical trial biospecimens awaiting shipment under ISTA 7E cold-chain validation protocols
• Backup cold storage for −80 °C freezers undergoing preventive maintenance or during power contingency scenarios
• Regulated biobank staging area where interim storage must comply with NBACC and ISBER Best Practices for sample integrity verification

FAQ

What is the recommended ambient operating temperature range for the DW-FL208?

The unit is validated for continuous operation in rooms maintained between 10 °C and 32 °C with relative humidity ≤70% non-condensing. Performance specifications assume airflow clearance of ≥100 mm on all sides and rear.
Does the DW-FL208 support external temperature monitoring or network connectivity?

Yes—optional RS485/Modbus RTU interface enables integration with building management systems (BMS) or environmental monitoring software. Analog voltage output (0–5 V) for zone A temperature is available upon request.
How is temperature uniformity verified across the storage volume?

Per ISO 15192:2022, uniformity is assessed using nine calibrated PT100 sensors placed at defined geometric locations within a fully loaded chamber. Typical results show ≤±2.5 °C deviation at steady state.
Can one chamber be powered down while the other remains operational?

Yes—the dual-zone control firmware permits independent enable/disable of each compartment’s refrigeration cycle without affecting the other zone’s thermal stability or control logic.
Is the unit suitable for storing liquid nitrogen–vapor-phase samples?

No. The DW-FL208 is not rated for cryogenic vapor-phase storage (−135 °C to −196 °C). It is intended exclusively for mechanical ultra-low temperature applications within the −25 °C to −40 °C range.