Tongzhou Weipu TL8000 Series Low-Temperature Circulating Chiller

Overview

The Tongzhou Weipu TL8000 Series Low-Temperature Circulating Chiller is an engineered thermal management system designed for precise, stable, and reproducible sub-ambient temperature control in demanding laboratory and pilot-scale applications. Operating within a validated working range of −80 °C to −20 °C, the TL8000 series employs a cascade refrigeration architecture with dual-stage compressors and environmentally compliant refrigerants (R23/R13 or R508B alternatives), enabling reliable low-temperature performance without liquid nitrogen dependency. Its thermodynamic design prioritizes thermal stability (< ±0.3 °C typical deviation over 24 h at steady state), rapid cooldown response (e.g., −80 °C achieved from ambient in ≤90 min on TL8075W), and long-term operational integrity under continuous duty cycles. The system is purpose-built for integration into closed-loop processes requiring external heat exchange—such as cryogenic condensation of volatile solvents, low-temperature reaction quenching in API synthesis, cryo-microscopy sample staging, and polymer crystallization studies—where consistent bath temperature and high volumetric flow delivery are critical to experimental fidelity.

Key Features

• 7-inch high-resolution TFT touchscreen interface with multilingual OS support (English, German, Chinese), real-time graphical trend display, and intuitive navigation for parameter entry, profile programming, and alarm review
• Multi-mode temperature control architecture: internal bath sensing, external PT100 feedback (via isolated analog input), master-slave cascaded control, and programmable 100-step ramp/soak sequences with time- and temperature-triggered events
• Advanced adaptive PID algorithm with multi-dimensional tuning parameters optimized for varying thermal loads, fluid viscosities, and heat exchanger configurations
• Dual cooling configuration options: air-cooled (F-series) with axial fans and aluminum finned condensers, or water-cooled (W-series) with stainless steel shell-and-tube heat exchangers rated for 3–6 bar inlet pressure
• Robust mechanical construction including electropolished 316L stainless steel reservoirs, reinforced PTFE-lined circulation pumps, and vibration-damped compressor mounts to minimize microthermal disturbance
• Comprehensive I/O interface suite: dry-contact alarm outputs (NO/NC), Modbus TCP Ethernet port (10/100BASE-T), isolated RS485 serial bus, and analog voltage/current inputs for third-party supervisory systems

Sample Compatibility & Compliance

The TL8000 series supports compatibility with a broad spectrum of heat transfer fluids—including synthetic hydrocarbon-based media (e.g., AUSI-05, AUSI-10) and low-temperature silicone oils—validated for continuous operation between −90 °C and +250 °C. All fluid pathways utilize seamless 316L stainless steel tubing with orbital-welded joints, complemented by custom-engineered insulated flex lines featuring dual-layer insulation (closed-cell elastomeric foam + aerogel composite) to suppress parasitic heat ingress. System design adheres to IEC 61000-6-2 (immunity) and IEC 61000-6-4 (emission) standards, and carries CE marking for EMC and LVD compliance. While not intrinsically certified for Zone 1 hazardous areas, explosion-proof variants (ATEX II 2G Ex db IIB T4 Gb / UL Class I Div 2) are available upon request with full documentation packages supporting FDA 21 CFR Part 11-compliant audit trails when paired with optional data logging firmware.

Software & Data Management

Embedded firmware includes non-volatile memory for storing ≥10,000 timestamped data points (temperature, pressure, pump speed, compressor status) accessible via USB mass storage export (CSV format). Optional Ethernet-enabled remote monitoring allows integration into LabVantage, DeltaV, or Siemens Desigo CCMS platforms using native Modbus TCP register mapping. Firmware version 3.2+ supports configurable event logging with user-defined severity levels (warning, error, critical), automatic backup of active control profiles, and password-protected administrator mode for calibration offset adjustment and sensor validation routines. Audit trail functionality satisfies GLP requirements for traceability, recording operator ID, timestamp, parameter change value, and reason code for all configuration modifications.

Applications

• Cryogenic condensation of process vapors in rotary evaporators, short-path distillation, and solvent recovery units
• Temperature-controlled bioreactor jacketing and fermentation vessel cooling in upstream bioprocessing
• Low-temperature material testing: tensile strength evaluation of composites at −70 °C, glass transition analysis of amorphous pharmaceuticals, and cryo-TEM grid freezing
• Calibration of infrared sensors, bolometers, and superconducting quantum interference devices (SQUIDs)
• Stabilized cooling for high-power laser diode arrays and photodetector test benches
• Environmental stress screening (ESS) chambers requiring stable sub-zero setpoints with high thermal inertia compensation

FAQ

What is the minimum achievable temperature with the TL8000 series, and how is it sustained?
The TL8000 series achieves and maintains −80 °C under nominal load conditions (20 L/min flow, 2 bar backpressure) using a two-stage cascade refrigeration cycle. Sustained operation at this temperature requires use of approved low-viscosity heat transfer fluids (e.g., AUSI-05) and proper insulation of external loops.
Can the TL8000 be integrated into a PLC-controlled production line?
Yes—Modbus TCP and RS485 Modbus RTU protocols enable bidirectional communication with Allen-Bradley, Siemens, and Omron PLCs. Register maps and sample ladder logic blocks are provided in the technical integration manual.
Is validation documentation (IQ/OQ) available for GMP environments?
Factory-applied IQ/OQ templates compliant with ASTM E2500 and Annex 15 are supplied with each unit. Full 3Q execution support—including calibrated reference sensors, protocol authoring, and witnessed testing—is available through Tongzhou Weipu’s global validation services team.
What maintenance intervals are recommended for continuous 24/7 operation?
Compressor oil analysis every 4,000 operating hours; refrigerant leak check and filter-drier replacement every 12 months; annual verification of PT100 sensor accuracy against NIST-traceable references.
Are custom fluid circuit configurations supported?
Yes—Tongzhou Weipu offers engineering consultation for bespoke manifolds, multi-zone distribution headers, vacuum-jacketed supply lines, and CIP-compatible loop designs meeting ASME BPE surface finish and weld criteria.