Zhongke Duling MDF-25V936 Medical Low-Temperature Storage Cabinet

Overview

The Zhongke Duling MDF-25V936 Medical Low-Temperature Storage Cabinet is engineered for reliable, long-term preservation of temperature-sensitive biological specimens—including plasma, serum, tissue samples, vaccines, and reagents—in clinical laboratories, blood banks, biobanks, and pharmaceutical quality control environments. Designed to operate continuously within a stable temperature range of −10 °C to −25 °C, the unit complies with core functional requirements outlined in ISO 13485 for medical device storage infrastructure and aligns with WHO guidelines for cold chain integrity in vaccine handling. Its thermodynamic architecture employs a dual-stage or cascade refrigeration system (depending on configuration), utilizing an environmentally compliant, non-ozone-depleting refrigerant—fully compliant with the Montreal Protocol and EU F-Gas Regulation (EC) No 517/2014. The cabinet’s high-density polyurethane insulation (CFC-free, ≥120 mm thick in critical zones) ensures thermal stability under fluctuating ambient conditions (10 °C–32 °C), minimizing temperature overshoot and recovery time after door openings.

Key Features

• Four-Panel Inner Door System: Reduces cold air loss by up to 65% compared to conventional single-door designs; each inner door seals independently, preserving compartmentalized thermal integrity during selective access.
• AISI 304 Stainless Steel Interior: Fully welded, seamless chamber construction resists corrosion from repeated disinfection cycles (e.g., 70% ethanol, sodium hypochlorite), supports GLP-compliant cleaning validation, and eliminates microbial harborage points.
• Intelligent Microprocessor Controller: Features real-time digital display, adjustable setpoint resolution (±0.1 °C), programmable alarm thresholds (high/low temperature, door ajar, power failure), and built-in keypad lock with multi-level password protection to prevent unauthorized parameter modification.
• Standard Remote Alarm Interface: Dry-contact output compatible with building management systems (BMS), laboratory information systems (LIS), or centralized alarm panels—enabling integration into ISO/IEC 17025-accredited environmental monitoring workflows.
• Dedicated Test Port: One 25 mm diameter access port located at the rear wall allows non-invasive insertion of calibrated temperature probes or data loggers without compromising chamber seal integrity—critical for 21 CFR Part 11-compliant temperature mapping and qualification studies.
• Energy-Efficient Operation: Optimized evaporator/fan layout and high-efficiency compressors deliver ≤10 kWh/24 h energy consumption at −25 °C, meeting IEC 60068-3-5 environmental testing standards for continuous operation under nominal load.

Sample Compatibility & Compliance

The MDF-25V936 accommodates standard storage configurations including stacked cryoboxes (e.g., 10×10 format), racked microtubes (1.5/2.0 mL), and bulk plasma bags (up to 500 mL). Its uniform internal airflow design—validated per ISO 14644-1 Class 8 cleanroom air distribution principles—ensures ±1.5 °C temperature uniformity across all shelf levels (per ICH Q5C stability protocol requirements). The unit conforms to electrical safety standards IEC 61010-1 (Ed. 3.0) and EMC directive 2014/30/EU. While not certified as a Class II medical device under MDR 2017/745, its design documentation, risk management file (ISO 14971), and traceable component sourcing support regulatory submission packages for end-user institutions subject to FDA 21 CFR Part 211 (cGMP) or EU Annex 15 (Qualification & Validation).

Software & Data Management

The cabinet operates autonomously but supports external data acquisition via its analog/digital alarm interface and test port. When paired with third-party validated temperature monitoring systems (e.g., DicksonOne, Sensitech LogTag, or ELPRO Libero®), it enables automated audit trails, electronic signatures, and alarm escalation protocols compliant with FDA 21 CFR Part 11 and EU Annex 11. The controller stores local event logs (last 100 entries) including timestamped alarms, door-open duration, and setpoint changes—exportable via optional RS485/Modbus RTU module (not included). All firmware updates are performed offline using encrypted USB key delivery to maintain cybersecurity integrity per NIST SP 800-53 Rev. 5 controls.

Applications

• Long-term archival storage of human biospecimens in biorepositories accredited to ISBER Best Practices.
• Cold-chain holding for investigational medicinal products (IMPs) prior to release testing per ICH GCP E6(R3).
• Stabilization of diagnostic reagents requiring −20 °C storage per CLSI EP26-A guidelines.
• Backup storage for ultra-low temperature freezers (−70 °C or −80 °C) during maintenance or defrost cycles.
• Regulated storage of reference standards and working standards in pharmaceutical QC labs operating under USP Analytical Instrument Qualification framework.

FAQ

What is the validated temperature uniformity across the chamber volume?
Temperature uniformity is ±1.5 °C (at −25 °C setpoint) when measured at nine standardized locations per ISO 14644-3:2019 Annex B, with doors closed and under static load conditions.
Does the unit support 21 CFR Part 11-compliant electronic records?
The cabinet itself does not generate Part 11-compliant records; however, its alarm interface and test port are fully compatible with validated third-party monitoring platforms that provide audit trail, electronic signature, and role-based access control features.
Can the inner doors be removed for large-item loading?
Yes—the four inner doors are modular and removable without tools, enabling flexible configuration for oversized containers such as 2-L media bottles or custom racks.
Is remote monitoring via Ethernet or Wi-Fi available?
No native network connectivity is integrated; remote capability requires external hardware integration via the dry-contact alarm output or optional RS485 expansion module.
What refrigerant is used, and is it compliant with global phase-down schedules?
The unit uses a low-GWP, non-ozone-depleting refrigerant blend (R404A or R507 equivalent), fully compliant with current EPA SNAP program listings and EU F-Gas Regulation Annex I substance authorizations.