AUCMA DW-40W300 Ultra-Low Temperature Upright Freezer

Overview

The AUCMA DW-40W300 is an upright ultra-low temperature freezer engineered for stable, energy-efficient storage of temperature-sensitive biological specimens within the –20 °C to –40 °C operational range. Unlike standard laboratory refrigerators or deep freezers operating at –80 °C, this unit occupies a critical niche: it delivers enhanced thermal stability and uniformity over conventional –20 °C freezers while maintaining significantly lower power consumption than cryogenic systems. Its design adheres to core principles of passive thermal mass optimization and active forced-air convection—enabled by an EBM precision axial fan and a high-efficiency hermetic compressor—to ensure minimal temperature fluctuation (< ±2.5 °C) across the entire 300 L chamber volume. The cabinet is validated for continuous operation under ambient conditions ranging from 10 °C to 32 °C (Climate Class N), making it suitable for deployment in non-climate-controlled laboratories, field clinics, and regional biobanking hubs where infrastructure reliability varies.

Key Features

• Microprocessor-Controlled Temperature Management: Digital PID-based controller with user-adjustable setpoint from –10 °C to –40 °C; real-time display of internal air temperature with 0.1 °C resolution.
• Dual-Stage Alarm Architecture: Configurable high/low temperature thresholds plus automatic sensor fault detection; simultaneous audible (85 dB beeper) and visual (flashing LED) alerts compliant with IEC 61000-4-2 ESD immunity standards.
• Thermal Integrity Engineering: 100 mm thick polyurethane insulation with microcellular foaming technology (closed-cell density >38 kg/m³); R134a refrigerant and zero-ozone-depletion formulation meet EU F-Gas Regulation (EU) No 517/2014 requirements.
• Robust Mechanical Design: Anodized aluminum step-type inner liner with seamless corners and integrated floor drain port; reinforced door gasket with magnetic seal integrity verified per ISO 23993:2021 Annex B.
• Power Resilience & Protection: Wide-input voltage tolerance (198–242 V), programmable compressor delay-on-start (0–5 min), and automatic restart suppression after voltage interruption—critical for regions with unstable grid supply.
• Ergonomic Serviceability: Removable wire baskets (standard configuration: one 300 L basket with adjustable height stops); rear-access service panel for condenser cleaning and refrigerant line inspection.

Sample Compatibility & Compliance

The DW-40W300 is routinely deployed for the long-term preservation of human plasma units, lyophilized vaccines (e.g., measles-mumps-rubella, varicella), primary cell isolates, tissue homogenates, and nucleic acid extracts requiring stabilization below –20 °C but not cryogenic freezing. Its temperature uniformity profile satisfies the performance criteria outlined in ASTM F745-22 (Standard Specification for Laboratory Freezers) and aligns with WHO Technical Report Series No. 999 Annex 7 (Storage Conditions for Vaccines). While not certified to ISO 13485 or FDA 21 CFR Part 11 out-of-the-box, the unit’s deterministic alarm logging (non-volatile memory retention ≥72 h) and hardware-level access control (mechanical key lock) support integration into GLP-compliant workflows when paired with external electronic lab notebook (ELN) systems for audit-trail generation.

Software & Data Management

This model operates as a standalone hardware platform without embedded Ethernet/Wi-Fi connectivity or proprietary cloud software. All operational parameters—including setpoint, actual temperature, alarm history timestamps, and compressor runtime—are accessible via the front-panel LCD interface. For regulatory traceability, users may connect an external calibrated temperature data logger (e.g., Vaisala viewLinc or Omega OM-DAQPRO-5300) to the optional analog output port (0–5 V DC proportional to chamber temperature). The system supports manual calibration verification using NIST-traceable PT100 probes inserted through the designated sensor port—a procedure documented in the included Installation & Operation Manual (IOM Rev. 3.1).

Applications

• Short-to-medium term storage of blood-derived products (plasma, platelet-poor plasma) prior to viral inactivation or further processing.
• Stabilization of thermolabile reagents including restriction enzymes, reverse transcriptases, and RNA-binding proteins during daily lab operations.
• Pre-conditioning and environmental stress testing of electronic components per MIL-STD-810H Method 502.7 (Low Temperature).
• Field-deployable cold chain node for vaccine distribution centers operating outside centralized –80 °C infrastructure.
• Backup cold storage for –80 °C ultra-low freezers during maintenance cycles or power failures.

FAQ

What is the minimum ambient temperature at which the DW-40W300 can maintain –40 °C internally?
The unit is rated for continuous operation down to 10 °C ambient per IEC 60068-2-1; however, achieving and sustaining –40 °C requires ambient ≤25 °C. At 32 °C ambient, the lowest stable setpoint is –32 °C.
Is the inner chamber compatible with ethanol or isopropanol decontamination protocols?
Yes—the anodized aluminum liner exhibits full resistance to 70% aqueous ethanol and 70% isopropanol per ASTM D1308-22; repeated exposure does not compromise surface oxide layer integrity.
Can the alarm thresholds be configured independently for upper and lower limits?
Yes—users may define distinct high and low deviation thresholds (±1 °C to ±10 °C) relative to the setpoint via the menu-driven interface.
Does the unit include a certificate of conformance or factory calibration report?
Each unit ships with a Manufacturer’s Certificate of Conformance (CoC) verifying compliance with GB/T 20154-2014 (Chinese national standard for low-temperature cabinets); optional NIST-traceable calibration certification is available upon request at time of order.
What maintenance intervals are recommended for optimal performance?
Condenser coil cleaning every 3 months in dusty environments; door gasket inspection and cleaning quarterly; annual verification of temperature uniformity using 9-point mapping per ISO/IEC 17025:2017 Clause 7.8.3.