Tongzhou Weipu TL6000 Series Low-Temperature Circulating Chiller

Overview

The Tongzhou Weipu TL6000 Series Low-Temperature Circulating Chiller is an engineered thermal management system designed for precise, stable, and repeatable temperature control in demanding laboratory and pilot-scale applications. Unlike general-purpose chillers, the TL6000 employs a closed-loop refrigeration architecture optimized for sustained operation at cryogenic setpoints down to −60 °C—without requiring liquid nitrogen or external cryogens. Its core thermodynamic design integrates a high-efficiency cascade or single-stage refrigeration circuit (model-dependent), low-viscosity synthetic heat transfer fluids, and a pressure-stabilized circulation loop to minimize thermal lag and ensure uniform bath or jacket temperature distribution. This system is routinely deployed in biopharmaceutical cold-chain validation, low-temperature reaction calorimetry, cryo-microscopy stage cooling, condenser trapping for rotary evaporation, and material property testing under sub-zero thermal stress. The unit operates exclusively within the −60 °C to 0 °C range—distinct from the broader −90 °C to +250 °C capability of the TC-series—and is calibrated and verified per ISO/IEC 17025-accredited procedures traceable to NIST standards.

Key Features

• 7-inch industrial-grade TFT LCD touchscreen interface with real-time graphical display of setpoint, actual temperature, pump pressure, refrigeration load, and alarm history
• Multi-dimensional PID control algorithm with auto-tuning and dynamic parameter adjustment based on thermal load, ambient conditions, and fluid viscosity changes
• Dual-mode temperature control: internal sensor feedback (standard Pt100 immersion probe) and external process feedback via user-supplied PT100 input (0–10 V / 4–20 mA optional)
• 100-step programmable temperature profile support—including ramp rates as low as 0.1 °C/min and soak stability of ±0.1 °C over 8-hour periods
• Modular cooling configuration: air-cooled (TL60xxW) and water-cooled (TL60xxF) variants, with optional ATEX-certified explosion-proof housings for Class I, Div 1 hazardous environments
• Stainless-steel fluid circuit with electropolished interior surfaces; compatible with synthetic heat transfer media including AU-280 (−90 °C to 150 °C), AUSI-05 (−80 °C to 220 °C), and AUSI-10 (−60 °C to 250 °C)
• Integrated dry-contact outputs for remote alarm signaling, emergency shutdown interlock, and PLC synchronization per IEC 61131-3 logic protocols

Sample Compatibility & Compliance

The TL6000 series is validated for continuous operation with non-corrosive, low-vapor-pressure synthetic heat transfer fluids only—never water, glycol/water mixtures, or hydrocarbon-based oils. Fluid selection must align strictly with the target operating temperature window and flash point requirements (e.g., AUSI-05 recommended for −80 °C applications due to its 128 °C flash point). All models comply with EN 61000-6-2 (immunity) and EN 61000-6-4 (emissions) for electromagnetic compatibility in shared lab infrastructure. Electrical safety conforms to IEC 61010-1:2010 + A1:2019 for laboratory electrical equipment. Optional documentation packages include Factory Acceptance Test (FAT) reports, IQ/OQ protocols aligned with ASTM E2500 and EU GMP Annex 15, and 21 CFR Part 11–ready audit trails when paired with Tongzhou Weipu’s optional data logging software.

Software & Data Management

While the TL6000 operates autonomously via its embedded controller, it supports full external integration through open-protocol interfaces. Modbus TCP enables seamless connection to LabVIEW, MATLAB, or SCADA systems for centralized monitoring and automated workflow triggering. RS485 Modbus RTU allows daisy-chaining of multiple units under a single master controller. USB port supports encrypted CSV export of time-stamped temperature, pressure, and power consumption logs (up to 30 days of 1-second resolution data). Optional Tongzhou Weipu ThermalLink™ software provides FDA 21 CFR Part 11–compliant electronic signatures, role-based access control, and automated report generation (PDF/Excel) meeting GLP audit requirements. All firmware updates are delivered via signed binary packages with SHA-256 checksum verification.

Applications

• Biopharmaceutical: Cryopreservation process development, low-temperature centrifugation support, and cold-room ambient simulation for stability studies (ICH Q5C)
• Chemical Synthesis: Exothermic reaction quenching, Grignard and organolithium reagent handling at −40 °C to −60 °C, and controlled crystallization kinetics
• Materials Science: Thermal cycling of polymers and composites per ASTM D696 and ISO 11359, low-temperature tensile testing fixtures, and cryo-SEM stage conditioning
• Analytical Instrumentation: Cooling of FTIR detector elements, LC-MS source compartments, and GC oven back-flushing circuits
• Environmental Testing: Accelerated aging chambers requiring stable sub-zero baselines for corrosion or coating adhesion validation

FAQ

What is the minimum achievable temperature stability at −60 °C?
At nominal load and with AUSI-05 fluid, the TL6000 achieves ±0.15 °C stability over 4 hours (measured at bath outlet, 1-minute averaging). Stability degrades marginally at extreme low-end setpoints due to compressor modulation limits.
Can the TL6000 be integrated into a distributed control system (DCS)?
Yes—via Modbus TCP over standard Ethernet or Modbus RTU over RS485. Register maps and protocol documentation are provided in the Engineering Integration Manual (Rev. 3.2, included with shipment).
Is external fluid filtration required?
A 5-µm inline filter is factory-installed upstream of the pump. For extended service intervals beyond 1,000 operating hours, we recommend adding a secondary 1-µm bypass filter with differential pressure monitoring.
What certifications are available for use in EU-regulated laboratories?
CE marking (EMC + LVD directives) is standard. RoHS 3 and REACH compliance documentation is supplied. ATEX certification for Zone 1/21 operation is available as a configured option (lead time +6 weeks).
How is calibration traceability maintained?
Each unit ships with a NIST-traceable calibration certificate for the primary Pt100 sensor and pressure transducer, valid for 12 months. Optional annual recalibration services include uncertainty budgets per ISO/IEC 17025.