Tianfeng TF-HX-5F Advanced Refrigerated/Heating Circulating Bath

Overview

The Tianfeng TF-HX-5F Advanced Refrigerated/Heating Circulating Bath is a high-precision, dual-mode thermal control system engineered for laboratory environments requiring stable, programmable temperature fields across an extended range of −60 °C to +99 °C. Unlike conventional water baths limited to ambient or mild heating, this unit integrates a hermetically sealed, air-cooled compressor system with a high-efficiency evaporator and PID-driven digital temperature regulation—enabling both active cooling and precise heating within a single compact chassis. Its operational principle relies on forced convection via internal circulation and externally routed fluid loops, establishing uniform thermal conditions not only inside the 5-liter stainless-steel bath chamber but also in external devices connected via insulated tubing. This makes it functionally equivalent to a standalone temperature-controlled heat sink or source—ideal for applications demanding dynamic thermal management beyond static immersion.

Key Features

• Wide operational temperature span (−60 °C to +99 °C) enabled by imported high-capacity refrigeration compressor and optimized evaporator geometry
• ±0.1 °C temperature stability under steady-state conditions, verified per ASTM E2784–19 guidelines for thermal stability testing
• Dual-circulation architecture: internal recirculation ensures bath homogeneity; external loop supports secondary temperature control for peripheral instrumentation
• Stainless-steel 304 inner tank resistant to corrosion from aqueous, ethylene glycol, or ethanol-based heat transfer fluids
• Microprocessor-based PID controller with real-time digital display of setpoint, actual temperature, and elapsed time
• Programmable functions including delayed start, timed shutdown, and user-defined ramp/soak profiles
• Comprehensive safety suite: over-temperature cutoff, differential-temperature alarm, low-level fluid detection, and compressor thermal overload protection
• Touch-sensitive membrane keypad with haptic feedback and IP65-rated front panel for lab-grade durability

Sample Compatibility & Compliance

The TF-HX-5F accommodates a broad spectrum of sample containers—including glass beakers, reaction flasks, jacketed reactors, and capillary viscometers—as well as integration with external equipment such as rotary evaporators, electrophoresis units, rheometers, cryogenic accessories (e.g., cooling caps, hypothermia blankets), and vacuum pumps. Its external circulation port supports flow rates up to 12 L/min at ≤0.3 bar backpressure, compatible with standard 10–16 mm ID silicone or fluoropolymer tubing. The unit complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and meets EMC requirements per EN 61326-1:2013. While not certified for medical device use per ISO 13485, its design adheres to GLP-relevant operational traceability standards—including timestamped temperature logging and configurable alarm event records—supporting audit readiness in regulated R&D and QC environments.

Software & Data Management

The TF-HX-5F operates autonomously via its embedded firmware without mandatory PC connectivity. However, optional RS485 serial interface (Modbus RTU protocol) enables integration into centralized lab monitoring systems for remote parameter adjustment, real-time temperature telemetry, and automated data archival. When interfaced with compliant SCADA or LIMS platforms, the unit supports electronic record generation aligned with FDA 21 CFR Part 11 principles—specifically through operator-authenticated session initiation, immutable audit trails of setpoint changes, and time-stamped deviation alerts. Data export formats include CSV and plain-text log files, facilitating post-acquisition analysis in MATLAB, Python (Pandas), or JMP.

Applications

This circulating bath serves critical roles across multiple scientific domains: in pharmaceutical development, it maintains precise thermal conditions during dissolution testing (USP ) and accelerated stability studies; in polymer science, it controls jacketed reactor temperatures during step-growth polymerization; in analytical chemistry, it supplies constant-temperature coolant to GC detectors or HPLC column ovens; in biophysics, it stabilizes electrophoretic mobility assays and enzyme kinetics measurements; and in materials testing, it provides thermal conditioning for tensile testers, DSC sample stages, and thermal conductivity analyzers. Its −60 °C capability further supports low-temperature crystallization trials and cryoprotectant validation protocols.

FAQ

What types of heat transfer fluids are compatible with the TF-HX-5F?
Deionized water, 30–50% aqueous ethylene glycol solutions, and silicone oils rated for −60 °C operation are validated. Avoid halogenated solvents or high-volatility alcohols.
Can the external circulation loop maintain temperature stability when connected to high-thermal-load instruments?
Yes—provided the connected device’s thermal load remains within 1.2 kW and tubing length does not exceed 5 meters with minimal bends, the system sustains ±0.2 °C stability at the point of use.
Is the unit suitable for continuous unattended operation?
It is designed for 24/7 duty cycles with automatic fault recovery and thermal cutouts, though periodic visual inspection of fluid level and tubing integrity is recommended per ISO/IEC 17025:2017 Clause 6.4.10.
Does the TF-HX-5F support calibration verification per ISO/IEC 17025?
Yes—the unit includes a dedicated PT100 sensor port for third-party reference probe insertion, enabling in-situ calibration verification against NIST-traceable standards.
What is the expected service life under routine laboratory use?
With annual preventive maintenance (compressor oil check, condenser coil cleaning, firmware update), mean time between failures exceeds 25,000 operating hours based on field data from 2020–2023 deployments.