Tianfeng TF-40-118-WA Ultra-Low Temperature Freezer

Overview

The Tianfeng TF-40-118-WA Ultra-Low Temperature Freezer is an engineered solution for stable, energy-efficient cryogenic storage in regulated laboratory and clinical environments. Designed for continuous operation at temperatures ranging from −15 °C to −40 °C, it employs a dual-mode cooling architecture—combining natural convection with targeted forced-air condensation—to ensure thermal stability under variable ambient conditions (up to 32 °C ambient, 60% RH). Its hermetically sealed refrigeration circuit utilizes an environmentally compliant, zero-ozone-depletion-potential (ODP) refrigerant blend, meeting international environmental directives including EU F-Gas Regulation (EU No. 517/2014) and China’s HCFC Phase-out Management Plan. The unit integrates a high-efficiency imported compressor, precision expansion valve control, and low-thermal-conductivity polyurethane insulation (≥120 mm thickness), enabling consistent temperature uniformity (±2.5 °C across chamber volume) and minimized thermal recovery time after door opening.

Key Features

• Stainless steel 304 interior and inner doors—corrosion-resistant, non-porous, and compatible with routine disinfection protocols (e.g., 70% ethanol, 0.5% sodium hypochlorite)
• Four independently sealed inner doors—minimizes cold air loss during selective access and reduces frost accumulation on evaporator surfaces
• Three-tier adjustable stainless steel shelving—enables flexible configuration for vial racks, cryoboxes, or sample trays without compromising airflow
• Hybrid condenser design—half natural convection, half fan-assisted—provides redundancy against dust-induced airflow restriction and extends compressor service life
• Acoustic optimization—sound-dampened cabinet structure and vibration-isolated compressor mounting achieve ≤57 dB(A) operational noise, suitable for shared lab spaces
• RS-232 serial interface (optional)—supports integration with building management systems (BMS) or centralized monitoring platforms for temperature logging and alarm forwarding
• Dual mechanical locking system—separate keyed door lock and main power lock—meets ISO 15190:2020 requirements for secure biospecimen storage
• Round-corner interior geometry—eliminates crevices for microbial accumulation and facilitates validated cleaning procedures per ISO 14644-1 Class 8 cleanroom maintenance standards

Sample Compatibility & Compliance

The TF-40-118-WA is validated for long-term storage of temperature-sensitive biological materials including peripheral blood mononuclear cells (PBMCs), plasma fractions, viral vectors, primary tissue explants, and lyophilized reagents. Its temperature stability profile supports compliance with key regulatory frameworks: WHO Technical Report Series No. 961 (2011) Annex 5 for vaccine cold chain integrity; AABB Standards for blood bank refrigerated storage; and CLSI GP44-A4 for frozen specimen handling. While not certified to UL 471 or IEC 61010-1 as a medical device, its construction adheres to electrical safety principles outlined in GB 4706.1–2005 (Chinese national equivalent of IEC 60335-1). All materials in contact with stored samples are REACH-compliant and free of phthalates, BPA, and heavy metals per RoHS Directive 2011/65/EU.

Software & Data Management

The freezer includes a microprocessor-based controller with LED display showing real-time internal temperature, setpoint, and system status (compressor run time, alarm history). Optional RS-232 connectivity enables ASCII-based data export at user-defined intervals (1–60 min) for traceability in GLP/GMP workflows. When interfaced with third-party data acquisition software (e.g., LabArchives ELN, Thermo Fisher SampleManager), the unit supports audit-trail generation—including timestamped temperature excursions, door-open events (>10 s), and manual setpoint changes—aligned with FDA 21 CFR Part 11 electronic record requirements. Local event logging retains ≥1,000 entries with date/time stamps, accessible via front-panel navigation.

Applications

This ultra-low temperature freezer serves core functions across multiple regulated domains: short-to-medium term storage of hematopoietic stem cells prior to cryopreservation processing; stabilization of thermolabile enzyme preparations (e.g., reverse transcriptase, Taq polymerase); quarantine holding of incoming biological reagents before QC release; cold-chain buffering in hospital blood banks between receipt and ABO/Rh typing; and field-deployable backup storage for remote research stations lacking liquid nitrogen infrastructure. It is routinely deployed in ISO/IEC 17025-accredited testing laboratories for reference material preservation and in biobanking facilities operating under ISBER Best Practices (2022 edition) for secondary storage tiers.

FAQ

What is the recommended ambient operating environment?
Operate within 10–32 °C ambient temperature and ≤60% relative humidity. Maintain ≥10 cm clearance behind and on both sides for adequate heat dissipation.
How frequently should the condenser filter be cleaned?
Inspect weekly in dusty environments; clean every 2–4 weeks using compressed air or a soft brush. Do not use water or solvents.
Can this unit store samples at −80 °C?
No. The TF-40-118-WA is rated for −15 °C to −40 °C operation. For −80 °C storage, refer to Tianfeng’s dedicated ultra-low temperature freezer series (e.g., TF-80 models).
Is validation documentation available for IQ/OQ protocols?
Yes—Tianfeng provides a Factory Acceptance Test (FAT) report and blank IQ/OQ templates aligned with ASTM E2500-13. On-site qualification support is available upon request.
Does the unit support remote monitoring via Ethernet or Wi-Fi?
No. RS-232 is the only standard communication interface. Ethernet/Wi-Fi modules are not supported in this model variant.