Duling MDF-25H100 / MDF-40H100 / MDF-60H100 Ultra-Low Temperature Laboratory Freezer (Horizontal)

Overview

The Duling MDF-25H100, MDF-40H100, and MDF-60H100 series represent a family of horizontal ultra-low temperature (ULT) laboratory freezers engineered for reliable long-term cryopreservation of biological specimens—including human tissue samples, primary cell lines, serum, plasma, DNA/RNA extracts, and vaccine formulations—at stable operating temperatures of –25 °C, –40 °C, and –60 °C respectively. Designed to meet the stringent thermal stability and energy-efficiency requirements of modern biomedical research labs, clinical biobanks, and pharmaceutical quality control environments, these units employ a hydrocarbon-based refrigeration cycle—compliant with global ozone-depletion and global-warming potential (GWP) regulations—combined with an optimized heat exchange architecture. The system utilizes a single-stage, hermetically sealed imported compressor, wire-and-tube condenser, and internally mounted serpentine evaporator to ensure uniform cold air distribution and rapid pull-down performance from ambient to setpoint within ≤120 minutes (typical). Thermal insulation is achieved via high-density, CFC-free polyurethane foam (≥120 mm thickness in door and cabinet walls), minimizing thermal bridging and maintaining cabinet integrity under continuous operation.

Key Features

• Horizontal configuration with top-opening door for ergonomic access and minimized cold air loss during frequent retrieval
• Hydrocarbon refrigerant (R290/R600a blend) — zero ODP, ultra-low GWP (<;10), fully compliant with EU F-Gas Regulation (EU No 517/2014) and EPA SNAP program guidelines
• Microprocessor-based temperature controller with ±0.1 °C display resolution and adjustable alarm thresholds for high/low temperature, door open, power failure, and sensor fault conditions
• Dual-point temperature monitoring capability via integrated 25 mm test port—compatible with external data loggers meeting ISO 17025-accredited calibration protocols
• Four heavy-duty casters (two swivel with mechanical brakes) enabling secure repositioning on standard laboratory flooring without requiring disassembly or service interruption
• Robust structural design: powder-coated steel exterior and interior cabinet surfaces—resistant to corrosion, cleaning agents, and routine decontamination procedures including 70% ethanol wipe-downs

Sample Compatibility & Compliance

These ULT freezers are validated for storage of temperature-sensitive biospecimens per ISO 20387:2018 (Biobanking — General requirements for biobank operations) and support adherence to CAP, CLIA, and AABB accreditation standards. The consistent temperature uniformity (±2.5 °C across all zones at –40 °C, per internal mapping per ICH Q5C Annex 1) ensures sample integrity throughout the 105 L usable volume. Units are suitable for use in GLP-compliant laboratories where traceable temperature records are required; when paired with a 21 CFR Part 11–compliant external data logger, full audit trails—including operator ID, timestamped alarms, and calibration history—can be maintained. No hazardous substances (e.g., CFCs, HCFCs, or HFCs) are used in manufacturing or operation, satisfying RoHS Directive 2011/65/EU and REACH SVHC screening criteria.

Software & Data Management

While the MDF-25 series features a standalone microcontroller interface without embedded network connectivity, its modular architecture supports seamless integration into centralized environmental monitoring systems (EMS). The 25 mm test port allows direct connection to third-party validated data loggers (e.g., Vaisala, Omega, or Elpro) capable of real-time cloud upload, email/SMS alerting, and automated PDF report generation. All logged temperature data may be archived in CSV or XML formats compatible with LIMS platforms such as LabVantage or STARLIMS. Firmware updates are performed locally via USB interface (optional accessory), ensuring continued compliance with evolving FDA and EMA guidance on electronic record retention and integrity.

Applications

• Cryostorage of primary human cells, induced pluripotent stem cells (iPSCs), and organoid cultures at –40 °C or –60 °C for downstream omics analysis
• Long-term archival of clinical trial biospecimens under ISO 20387-aligned biobanking SOPs
• Stabilization of thermolabile reagents including monoclonal antibodies, cytokines, and CRISPR-Cas9 ribonucleoprotein complexes
• Backup cold chain storage for vaccine distribution centers operating under WHO PQS cold chain requirements
• QC/QA holding environment for raw materials and finished products in GMP-compliant pharmaceutical manufacturing suites

FAQ

What is the recommended ambient operating temperature range for this unit?
The MDF-25H100/MDF-40H100/MDF-60H100 is rated for continuous operation in ambient environments between +10 °C and +32 °C, with relative humidity ≤70% non-condensing.

Does the unit include a factory calibration certificate?
Yes—each unit ships with a traceable NIST-traceable temperature calibration certificate (at three points: –25 °C, –40 °C, and –60 °C) issued by the manufacturer’s ISO/IEC 17025-accredited metrology lab.

Can the freezer be installed in a confined space?
Minimum clearance requirements are 150 mm rear, 100 mm sides, and 100 mm top to ensure adequate airflow over condenser coils and sustained thermal performance.

Is remote monitoring supported out-of-the-box?
No native Ethernet or Wi-Fi interface is included; however, the test port enables plug-and-play integration with certified third-party EMS hardware supporting Modbus RTU or analog 4–20 mA output protocols.

What maintenance intervals are recommended?
Compressor oil inspection every 24 months; condenser coil cleaning every 6 months (using compressed air or soft brush); door gasket integrity check quarterly per preventive maintenance SOPs aligned with ISO 13485.