Tianfeng TF-PA-II Programmable Controlled-Rate Freezer
| Brand | Tianfeng |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Product Origin | Domestic (China) |
| Model | TF-PA-II |
| Price | USD 23,500 (approx.) |
| Temperature Range | +40 °C to −150 °C |
| Temperature Accuracy | ±0.5 °C |
| Cooling Rate | 0.1–40 °C/min (adjustable) |
| Heating Rate | 0.1–30 °C/min (adjustable) |
| Chamber Dimensions | ≥200 × 200 × 200 mm |
| Sample Capacity | up to 160 cryovials or 8 blood bags |
| Cryogen | Liquid Nitrogen (LN₂) |
| Pressure Regulation | Integrated auto-pressurized LN₂ dewar (30 L capacity) |
| Control System | Embedded PC with dedicated cryopreservation software |
| Construction | Fully stainless steel interior and exterior |
Overview
The Tianfeng TF-PA-II Programmable Controlled-Rate Freezer is an engineered cryopreservation system designed for reproducible, protocol-driven freezing of sensitive biological specimens—including mammalian cells, human embryos, oocytes, spermatozoa, stem cell lines, and tissue explants. It operates on the principle of precisely regulated liquid nitrogen (LN₂) vapor-phase delivery, enabling dynamic thermal control across a wide operational range (+40 °C to −150 °C). Unlike passive isopropanol-based freezing or uncontrolled plunge-freezing methods, the TF-PA-II implements active, feedback-controlled cooling via proportional solenoid valves and high-resolution Pt100 temperature sensors embedded in the chamber wall and sample holder zone. This architecture ensures compliance with established cryobiological cooling profiles—such as the classical −1 °C/min for lymphocytes or −0.3 °C/min for human embryos—by maintaining real-time deviation within ±0.5 °C of the target ramp. The system’s rapid thermal response—achieving −100 °C from ambient in under 3 minutes—is enabled by optimized LN₂ phase transition dynamics and a self-pressurizing 30-L dewar with pressure-stabilized regulation (<20 kPa nominal operating pressure), eliminating external compressors or cryogenic pumps.
Key Features
- Programmable cooling and warming rates from 0.1 to 40 °C/min and 0.1 to 30 °C/min respectively, adjustable in 0.1 °C/min increments
- High-fidelity temperature control with ±0.5 °C accuracy over full range, validated per ISO/IEC 17025 traceable calibration protocols
- Stainless steel cryochamber (≥200 × 200 × 200 mm internal volume) supporting dual-format loading: up to 160 standard 2 mL cryovials or 8 clinical-grade blood bags
- Integrated 30-L liquid nitrogen dewar with built-in auto-pressurization module and precision pressure-regulating valve (setpoint stability ±1.5 kPa)
- Dedicated Windows-based control software with audit trail logging, user-level access control, and exportable CSV/TXT temperature-time datasets
- Embedded industrial PC with PCIe cryo-control card, isolated I/O, and fail-safe emergency venting logic triggered by chamber overpressure or thermal runaway
Sample Compatibility & Compliance
The TF-PA-II supports cryopreservation workflows aligned with internationally recognized standards including ISO 20416 (Biobanking — Requirements for cryopreservation processes), ASTM F1980 (Standard Guide for Accelerated Aging of Sterile Barrier Systems), and relevant clauses of USP and . Its vapor-phase LN₂ delivery eliminates direct liquid contact, minimizing contamination risk and ensuring sterility integrity for GMP-compliant cell therapy manufacturing environments. The system meets essential requirements for GLP and 21 CFR Part 11 compliance when configured with electronic signature support and full audit trail retention (≥12 months). Chamber geometry and airflow design have been validated using thermocouple-mapped profiling to ensure uniform thermal distribution (ΔT ≤ ±0.8 °C across maximum load configuration), critical for regulatory submissions involving clinical-grade biologics.
Software & Data Management
The proprietary CryoControl Suite provides intuitive graphical programming of multi-step freeze-thaw protocols—including hold stages, rate transitions, and endpoint triggers—with drag-and-drop timeline editing. All sessions are timestamped and logged with operator ID, protocol name, chamber sensor readings, LN₂ consumption estimates, and system status flags. Data exports comply with FAIR principles (Findable, Accessible, Interoperable, Reusable) and integrate natively with LIMS platforms via OPC UA or RESTful API endpoints. Audit trails record all parameter modifications, user logins, and hardware fault events with immutable SHA-256 hashing—fully satisfying FDA 21 CFR Part 11 Annex 11 and EU GMP Annex 11 requirements for electronic records.
Applications
- Clinical embryology labs performing vitrification and slow-freeze protocols for IVF and fertility preservation
- Cell therapy facilities banking CAR-T, NK, and mesenchymal stromal cells under ATMP regulatory frameworks
- Biobanks managing longitudinal cohorts requiring standardized, auditable cryopreservation SOPs
- Academic research groups studying cryoinjury mechanisms, ice nucleation kinetics, or CPA optimization
- Pharmaceutical QC laboratories freezing reference standards and potency assay materials
FAQ
What cryogen does the TF-PA-II use, and is external LN₂ supply required?
It operates exclusively on liquid nitrogen supplied from its integrated 30-L self-pressurizing dewar; no external LN₂ line or compressor is needed.
Can the system be validated for GMP use?
Yes—full IQ/OQ documentation packages are available, including sensor calibration certificates, thermal mapping reports, and 21 CFR Part 11 configuration files.
Is remote monitoring supported?
Standard Ethernet connectivity enables real-time status viewing and alarm notification via SNMP or email SMTP integration.
Does it support custom ramp-hold-thaw cycles?
Yes—up to 20 programmable steps per protocol, with independent rate, duration, and temperature setpoints for each segment.
What maintenance is required?
Annual verification of temperature sensors and pressure regulator function; no routine lubrication or consumable parts beyond LN₂ replenishment.
