MDF-25V100 Ultra-Low Temperature Freezer by Zhongke Duling

Overview

The MDF-25V100 is an upright ultra-low temperature (ULT) freezer engineered for reliable, long-term cryogenic storage of biological samples—including cell lines, primary tissues, plasma, serum, DNA/RNA extracts, and reagents requiring stable thermal conditions at –25 °C to –40 °C. Designed in accordance with ISO 13485-aligned manufacturing practices and validated for laboratory-grade performance, this unit employs a dual-stage cascade refrigeration system with environmentally compliant R404A/R23 mixed-refrigerant circuitry to achieve rapid pull-down times and high thermal stability across the full operating range. Its compact footprint (540 mm × 540 mm base) and 100 L usable capacity make it especially suitable for space-constrained biosafety cabinets, core facilities, and clinical research laboratories where consistent cold chain integrity is critical to sample viability and regulatory compliance.

Key Features

• Stable temperature control within ±2 °C uniformity across all zones, verified per IEC 60068-3-5 thermal mapping protocols.
• Microprocessor-based PID controller with real-time digital display, adjustable setpoint range from –25 °C to –40 °C, and audible/visual alarm activation upon deviation exceeding ±3 °C or power interruption.
• High-efficiency vacuum-insulated panels (VIPs) combined with polyurethane foam (≥120 mm thickness) minimize heat ingress and reduce energy consumption to ≤150 W average during steady-state operation.
• Corrosion-resistant stainless-steel interior chamber (410 × 410 × 670 mm) with rounded corners and seamless welds to facilitate cleaning and prevent microbial accumulation.
• Ergonomic design including heavy-duty casters with locking mechanism, reinforced door hinge system, and magnetic gasket seal ensuring >95% door closure integrity under repeated use.
• Integrated data logging capability (optional external interface) supports GLP-compliant audit trails when paired with third-party environmental monitoring systems.

Sample Compatibility & Compliance

The MDF-25V100 is routinely deployed for storage of WHO-recommended cold-chain-sensitive materials, including but not limited to: PBMCs, cryopreserved hepatocytes, monoclonal antibody stocks, viral vectors, and diagnostic calibrators. It meets essential requirements for ISO 554 (standard atmospheres), ASTM F2697 (performance criteria for ULT freezers), and aligns with CLSI GP35-A4 guidelines for temperature-controlled storage of clinical specimens. While not certified to FDA 21 CFR Part 11 out-of-the-box, its analog control architecture permits integration into validated workflows when used with qualified external data loggers meeting GxP documentation standards.

Software & Data Management

This model operates via embedded firmware without onboard PC software; however, its RS-485 communication port (optional accessory) enables connection to centralized building management systems (BMS) or validated environmental monitoring platforms such as DicksonOne, SensiLog, or TempTale Ultra. Alarm events—including door-open duration (>30 s), temperature excursion, and power failure—are timestamped and can be exported as CSV for inclusion in laboratory quality records. For labs operating under CAP or COLA accreditation, the unit supports periodic verification using NIST-traceable thermistors and documented calibration procedures per SOP-LAB-TEMP-002.

Applications

• Clinical trial biobanking: Secure interim storage of human biospecimens prior to shipment to central repositories.
• QC/QA laboratories: Holding reference standards and working solutions for immunoassays and molecular diagnostics.
• Academic research: Preservation of genetically modified model organisms (e.g., frozen C. elegans stocks, zebrafish embryos).
• Vaccines and biologics development: Cold staging of adjuvanted formulations and lyophilized intermediates requiring non-frozen yet deeply chilled environments.
• Pathology departments: Short-to-medium term archiving of formalin-fixed paraffin-embedded (FFPE) tissue blocks requiring moisture-controlled sub-zero conditions.

FAQ

What is the minimum achievable temperature for the MDF-25V100?

The unit is rated for operational stability between –25 °C and –40 °C; it is not designed for –86 °C operation.
Does the freezer include a factory calibration certificate?

No standard calibration certificate is supplied; users must perform initial verification using accredited thermometry per internal SOP or ISO/IEC 17025-accredited service providers.
Can this unit be installed in non-air-conditioned rooms?

Ambient operating conditions must remain between +10 °C and +32 °C with relative humidity ≤70% RH non-condensing to ensure compressor longevity and thermal consistency.
Is remote monitoring supported natively?

Native Ethernet or Wi-Fi connectivity is not integrated; remote oversight requires external hardware gateways compatible with Modbus RTU over RS-485.
How often should the condenser coils be cleaned?

Bi-monthly inspection and vacuuming are recommended in standard lab environments; more frequent maintenance may be required in dusty or high-particulate settings.