Tianfeng TF-HX-10A Precision Refrigerated/Heated Circulating Bath

Overview

The Tianfeng TF-HX-10A Precision Refrigerated/Heated Circulating Bath is a compact, microprocessor-controlled constant-temperature source engineered for high-stability thermal regulation in laboratory and industrial R&D environments. Unlike basic water baths, this unit integrates a dual-mode thermoregulation system—combining Peltier-free refrigeration (via an air-cooled, hermetically sealed imported compressor) with resistive heating—to deliver precise temperature control across a wide operational span from −10 °C to 99 °C. Its core function relies on forced convection through an optimized evaporator design and a low-turbulence internal circulation pump, ensuring uniform thermal distribution within the 10-liter stainless-steel bath chamber (±0.1 °C stability at setpoint). The device supports both internal temperature equilibration and external fluid transfer via dual-port circulation ports, enabling it to serve as a remote temperature source for ancillary instrumentation—including rotary evaporators, viscometers, electrophoresis systems, cryogenic medical devices (e.g., cooling caps or hypothermia blankets), and vacuum pumps requiring active thermal management.

Key Features

• High-precision PID temperature control algorithm with digital LED display for real-time monitoring of bath temperature and timer functions
• Stainless-steel interior tank resistant to corrosion, thermal shock, and chemical exposure—compatible with aqueous and mild organic media
• Dual-mode operation: simultaneous refrigeration and heating capability eliminates need for separate cold/hot baths
• Internal + external circulation architecture allows direct integration with external equipment via flexible silicone tubing (standard 10–12 mm ID)
• Intelligent safety suite: over-temperature cutoff, differential-temperature alarm (detects deviation between sensor reading and actual bath gradient), scheduled startup, and delayed shutdown
• Compact footprint (452 × 313 × 797 mm) optimized for benchtop use in constrained laboratory spaces
• Energy-efficient air-cooled refrigeration system with rapid cooldown profile—achieves −10 °C from ambient in under 45 minutes under standard load conditions

Sample Compatibility & Compliance

The TF-HX-10A accommodates a broad range of sample containers—from standard 500 mL beakers to custom reaction vessels—and maintains thermal homogeneity regardless of vessel geometry or immersion depth, provided fluid volume remains within recommended operating limits. It is compatible with water, ethylene glycol/water mixtures (up to 30% v/v), silicone oils (for elevated temperature applications), and other non-aggressive heat-transfer fluids. All wetted parts are constructed from 304 stainless steel and food-grade EPDM seals, meeting material compatibility requirements per ASTM D471 and USP Class VI standards. Manufacturing adheres to ISO 9001:2000 quality management protocols, with full traceability for critical components including compressors and temperature sensors. While not certified for GMP or FDA 21 CFR Part 11 compliance out-of-the-box, the device supports GLP-aligned documentation when paired with validated external data loggers and audit-trail-capable software interfaces.

Software & Data Management

The TF-HX-10A operates via embedded firmware without proprietary PC software; however, its RS-232 serial port (optional adapter available) enables connection to third-party data acquisition platforms such as LabVIEW, MATLAB, or custom Python-based logging tools. Temperature setpoints, runtime status, and alarm events are timestamped and retained in non-volatile memory for post-experiment review. For regulated environments, users may integrate the unit into centralized monitoring networks using Modbus RTU protocol (via optional communication module), supporting automated calibration verification logs and electronic record retention compliant with 21 CFR Part 11 Annex 11 requirements when deployed with appropriate validation packages.

Applications

• Controlled-rate cooling/heating of samples prior to chromatographic analysis (HPLC, GC injector ovens)
• Thermal conditioning of polymer melts during rheological testing and DSC sample preparation
• Stabilization of laser sources, photomultiplier tubes, and CCD detectors in optical metrology setups
• Supporting cryo-electron microscopy workflows by supplying chilled coolant to stage chillers or circulator-integrated specimen holders
• Temperature-dependent enzymatic assays and cell culture incubation pre-conditioning in molecular biology labs
• Calibration of thermocouples, RTDs, and infrared thermometers against NIST-traceable references
• Process simulation in pilot-scale pharmaceutical development—e.g., controlled crystallization, lyophilization shelf pre-cooling, and dissolution apparatus temperature validation

FAQ

What is the maximum permissible fluid height for optimal thermal uniformity?
For consistent ±0.1 °C stability, maintain fluid level between 30 mm below the top rim and 20 mm above the internal pump inlet—approximately 8–9 L for full 10 L capacity.
Can the unit operate continuously at −10 °C in ambient temperatures above 30 °C?
Yes, but sustained operation under high ambient loads requires adequate ventilation clearance (≥150 mm on all sides) and periodic condensate drainage to prevent compressor cycling inefficiency.
Is external circulation flow rate adjustable?
The integrated pump delivers a fixed nominal flow of 12 L/min at 0.15 bar backpressure; variable-speed control is not supported natively but can be added via inline PWM-driven DC pump modules.
Does the device support remote start/stop via dry-contact input?
Not by default; however, the RS-232 interface permits programmable command triggering (e.g., “START”, “STOP”, “SET TEMP=25.0”) when used with compatible host controllers.
What maintenance intervals are recommended for long-term reliability?
Compressor oil and refrigerant integrity should be verified annually; stainless-steel bath interior requires bi-weekly deionized water flush if used with salt solutions; air filter cleaning every 90 days in dusty environments.