Tianfeng TF-HX-20F Advanced Precision Circulating Chiller/Heater

Overview

The Tianfeng TF-HX-20F Advanced Precision Circulating Chiller/Heater is a high-performance, dual-mode thermal management system engineered for laboratory and industrial applications requiring stable, programmable temperature control across an exceptionally wide range (−60 °C to +99 °C). Unlike basic water baths, this unit integrates a hermetically sealed, air-cooled refrigeration circuit with precision resistive heating elements and a robust stainless-steel bath chamber—enabling both active cooling and heating within a single compact architecture. Its core function is to generate and maintain a highly uniform, thermally stable environment either internally (within the 20 L bath) or externally via forced circulation through auxiliary equipment. The system operates on the principle of closed-loop liquid circulation, where a heat-transfer fluid (typically water or water–glycol mixtures) is conditioned in the bath reservoir and pumped—via adjustable flow rate—to external devices such as rotary evaporators, viscometers, electrophoresis units, cryogenic medical devices, or vacuum pumps. This makes the TF-HX-20F not merely a static bath but a dynamic, field-source temperature controller compliant with rigorous experimental reproducibility standards.

Key Features

• Wide operational temperature span (−60 °C to +99 °C) enabled by high-efficiency, imported air-cooled compressors and optimized evaporator geometry based on large-volume refrigeration dynamics
• ±0.1 °C temperature stability at setpoint, achieved through digital PID algorithm with adaptive tuning and real-time feedback from high-resolution Pt100 sensors
• Dual-circulation capability: internal recirculation ensures bath homogeneity; external circulation supports integration with third-party instrumentation via standard 1/2″–3/4″ quick-connect ports
• Stainless-steel 20 L bath chamber with corrosion-resistant finish, designed for long-term compatibility with aqueous and mildly aggressive thermal fluids
• Intuitive touch-sensitive soft-key interface with dual digital displays showing real-time bath temperature and programmed setpoint; supports timer-based startup/shutdown scheduling
• Comprehensive safety suite including over-temperature cutoff, differential-temperature alarm (detecting abnormal ΔT between sensor and bath), and automatic fault logging
• Compact footprint (1020 × 630 × 1000 mm) with front-access service panel for maintenance of compressor, pump, and electrical modules

Sample Compatibility & Compliance

The TF-HX-20F is compatible with a broad spectrum of heat-transfer media—including deionized water, 30%–50% ethylene glycol/water solutions, and low-viscosity silicone oils—ensuring suitability for cryogenic, ambient, and elevated-temperature protocols. Its stainless-steel wetted components meet ASTM A240 and ISO 8502-3 material specifications for laboratory-grade corrosion resistance. While not certified to UL/CSA or CE for North American/EU market placement without regional adaptation, the unit complies with ISO 9001:2015 quality management requirements throughout design, manufacturing, and testing phases. It supports GLP-compliant workflows through traceable temperature logging (when paired with optional RS485/Modbus-enabled data acquisition systems) and is routinely deployed in laboratories adhering to USP , ISO/IEC 17025, and GMP Annex 15 thermal validation frameworks.

Software & Data Management

The TF-HX-20F features embedded firmware supporting local parameter configuration and real-time monitoring via its integrated display. For advanced integration, optional communication modules enable Modbus RTU (RS485) or analog 4–20 mA output, allowing connection to SCADA platforms, LIMS, or centralized HVAC control systems. When interfaced with validated third-party software (e.g., LabVIEW, MATLAB, or custom Python-based DAQ scripts), users can implement automated ramp-soak-hold profiles, export timestamped temperature logs (CSV format), and trigger alarms via email/SNMP upon deviation thresholds. Audit trail functionality—including operator ID tagging, parameter change history, and calibration event logging—is achievable when deployed with FDA 21 CFR Part 11–compliant electronic record systems.

Applications

• Chemical synthesis: precise temperature control during exothermic/endothermic reactions, crystallization studies, and reflux setups
• Pharmaceutical R&D: cold-chain validation for drug stability testing (ICH Q1A–Q5C), dissolution apparatus temperature regulation
• Materials science: thermal cycling of polymer samples, rheological characterization under controlled thermal gradients
• Biotechnology: electrophoresis buffer cooling, PCR instrument pre-chilling, cryopreservation support
• Instrumentation support: secondary cooling for SEM/TEM chillers, vacuum pump thermal management, laser cavity stabilization
• Quality control labs: viscosity measurement per ASTM D445, density determination per ISO 1183, and thermal expansion coefficient analysis

FAQ

What types of external equipment can be connected to the TF-HX-20F’s external circulation port?
Rotary evaporators, viscometers, electrophoresis tanks, cryosurgical devices (e.g., cooling caps or hypothermia blankets), vacuum pumps, and analytical instruments requiring thermal load management.
Is the bath fluid level automatically monitored?
No—fluid level must be manually verified before operation; however, low-level detection is available as an optional add-on module.
Can the unit operate continuously at −60 °C?
Yes, provided ambient conditions remain ≤25 °C and relative humidity <70%; continuous sub-zero operation requires use of antifreeze-compatible fluid and periodic defrost cycle execution.
Does the system support remote calibration verification?
Calibration traceability is maintained via factory-certified Pt100 sensors; field verification requires external reference thermometer and documented SOP per ISO/IEC 17025 Clause 6.5.
What maintenance intervals are recommended for the compressor and circulation pump?
Compressor oil inspection every 12 months; pump impeller cleaning and seal check every 6 months; full system performance validation annually or after 2000 operating hours.