DW-40L262 Ultra-Low Temperature Upright Freezer

Overview

The DW-40L262 Ultra-Low Temperature Upright Freezer is an engineered solution for stable, long-term storage of temperature-sensitive biological specimens, reagents, vaccines, and clinical samples at precisely controlled conditions between –10 °C and –40 °C. Designed for rigorous laboratory environments—including research institutes, blood banks, public health laboratories (e.g., CDC-affiliated facilities), veterinary diagnostic centers, and pharmaceutical QC labs—the unit employs a dual-stage cascade-freezing architecture optimized for thermal stability, energy efficiency, and operational reliability. Unlike standard cold storage units, the DW-40L262 integrates a direct-cooling evaporator-as-shelf design, minimizing thermal lag and ensuring rapid recovery after door openings—a critical performance attribute in high-throughput biospecimen handling workflows.

Key Features

• Microprocessor-based temperature control system with high-resolution LED digital display (±0.1 °C resolution) and user-adjustable setpoint range from –10 °C to –40 °C
• Dual-failure detection logic: independent high/low temperature alarm + sensor fault diagnostics, each triggering both audible (piezo buzzer) and visual (red LED indicator) alerts
• Intelligent power management: automatic restart delay on power restoration to protect compressor from surge stress; non-volatile memory retains setpoints and alarm history during outages
• High-efficiency Danfoss rotary compressor paired with R290/R170 eco-friendly refrigerant blend—zero ozone depletion potential (ODP = 0), low global warming potential (GWP < 10)
• German-engineered EBM axial fans ensure uniform airflow distribution across all storage zones, reducing vertical temperature gradients to ≤ ±1.5 °C (measured per IEC 61000-4-30)
• Structural insulation: 100 mm thick polyurethane foam with CFC-free blowing agent, achieving effective thermal resistance (R-value) > 3.8 m²·K/W
• Ergonomic upright configuration with top-hinged lid (optimized for DW-40L262 variant), integrated ergonomic handle, three-point mechanical door lock, and four swiveling casters with locking brakes

Sample Compatibility & Compliance

The DW-40L262 supports storage of primary human tissues, cryopreserved cell lines (e.g., PBMCs, stem cells), RNA/DNA extracts, monoclonal antibodies, viral vectors, and diagnostic reference standards requiring sustained sub-zero integrity. Its temperature uniformity profile meets ASTM F2607–22 requirements for ultra-low temperature freezers used in biobanking applications. The unit’s alarm logging function records timestamps and event types (e.g., door open duration, temperature excursions), supporting GLP-compliant documentation under ISO/IEC 17025 and FDA 21 CFR Part 11 when integrated with validated LIMS or ELN platforms. No internal defrost cycle is implemented—ensuring uninterrupted thermal continuity for irreplaceable biospecimens.

Software & Data Management

While the DW-40L262 operates as a standalone hardware platform without embedded network connectivity, its analog alarm outputs (dry contact relay) and RS-232 serial interface enable integration with third-party building management systems (BMS), environmental monitoring networks (e.g., SensiNet, TempTale), or custom SCADA architectures. Optional external data loggers compliant with NIST-traceable calibration protocols may be deployed to generate audit-ready PDF reports meeting ISO 13485 Annex A and EU Annex 11 validation expectations. All firmware updates are performed via secure USB interface under controlled change management procedures.

Applications

• Long-term archiving of clinical trial biospecimens in centralized biorepositories
• Stabilization of thermolabile enzymes and co-factors in molecular biology core facilities
• Cold chain continuity for vaccine distribution hubs operating under WHO PQS guidelines
• Storage of reference materials for proficiency testing programs accredited to ISO/IEC 17043
• Backup freezing capacity for –80 °C ultra-low freezers undergoing maintenance or validation
• Regulatory-compliant storage of residual samples for forensic toxicology and doping control laboratories

FAQ

What is the recommended ambient operating environment for the DW-40L262?

The unit is rated for continuous operation in ambient temperatures of 10 °C to 32 °C and relative humidity ≤ 80% non-condensing, per IEC 61000-6-3 immunity standards.
Does the freezer support remote monitoring or Ethernet connectivity?

No native Ethernet or Wi-Fi module is included; however, optional third-party IoT gateways can be interfaced via the RS-232 port or relay outputs for cloud-based alerting.
Is the DW-40L262 compliant with UL 471 or EN 61000-3-2?

Yes—it carries cULus certification per UL 471 (Commercial Refrigerators and Freezers) and meets EN 61000-3-2 Class A harmonic current limits for industrial equipment.
Can the unit be validated for GxP use?

Yes—its deterministic temperature control, alarm traceability, and mechanical construction support IQ/OQ/PQ execution per ASTM E2500 and Annex 15 of the EU GMP Guidelines.
What is the typical pull-down time from 25 °C ambient to –40 °C internal?

Approximately 2.8 hours under no-load conditions, verified per ISO 23953-2 test methodology.