Tianfeng TF-HX-30B Low-Temperature Circulating Bath
| Brand | Tianfeng |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Product Category | Domestic |
| Model | TF-HX-30B |
| Instrument Type | Constant-Temperature Bath |
| Circulation Mode | Internal & External Circulation |
| Temperature Control | Refrigeration & Heating |
| Bath Volume | 30 L |
| Temperature Range | −20 °C to 99 °C |
| Temperature Stability | ±0.1 °C |
| Power Supply | 220 V / 50 Hz |
| Rated Power | 1400 W |
| Dimensions (Operating) | 280 × 250 × 230 mm (L×W×H) |
| Overall Dimensions | 690 × 540 × 1070 mm (L×W×H) |
Overview
The Tianfeng TF-HX-30B Low-Temperature Circulating Bath is a precision-engineered, dual-mode (refrigeration/heating) constant-temperature source designed for laboratory environments requiring stable thermal control across a broad operational range (−20 °C to 99 °C). Built upon a compact, stainless-steel bath architecture and integrated with a high-efficiency air-cooled hermetic compressor system, it delivers rapid cooling kinetics and uniform temperature distribution—enabled by an optimized evaporator design based on large-volume refrigeration principles. Unlike passive water baths, the TF-HX-30B actively maintains setpoint accuracy through PID-controlled thermal regulation with real-time digital feedback, ensuring long-term stability within ±0.1 °C under dynamic load conditions. Its dual-circulation capability—supporting both internal bath homogenization and external fluid delivery via flexible tubing—enables seamless integration as a secondary temperature control module for externally mounted instruments.
Key Features
- Air-cooled, hermetically sealed imported compressor for reliable low-temperature performance and extended service life
- Dual-mode thermal regulation: simultaneous heating and refrigeration with independent power management
- Stainless-steel inner tank (30 L capacity) resistant to corrosion and compatible with aqueous and mild organic media
- Touch-sensitive soft-key interface with LED digital display for temperature setpoint, real-time bath temperature, and timer functions
- PID-based temperature control algorithm delivering high reproducibility and minimal overshoot during ramp transitions
- Programmable functions including scheduled startup, delayed shutdown, and user-defined hold times
- Comprehensive safety protection: over-temperature alarm, differential-temperature warning, and automatic cut-off on sensor failure
- External circulation port with standardized G1/4″ BSP fitting for connection to auxiliary equipment (e.g., rotary evaporators, viscometers, electrophoresis units)
Sample Compatibility & Compliance
The TF-HX-30B is compatible with standard laboratory fluids including deionized water, ethanol–water mixtures, and silicone oil (within viscosity limits appropriate for the pump head). It is not intended for use with highly volatile, flammable, or strongly corrosive solvents without prior validation. The unit complies with ISO 9001:2000 quality management standards and conforms to IEC 61010-1:2010 requirements for electrical safety in laboratory equipment. While not certified for medical device use per FDA 21 CFR Part 820, its temperature stability and traceable calibration support GLP-compliant experimental workflows in analytical chemistry, pharmaceutical development, and materials characterization laboratories.
Software & Data Management
The TF-HX-30B operates via embedded firmware with no external PC dependency. All operational parameters—including setpoint, actual temperature, elapsed time, and alarm status—are continuously displayed and logged in non-volatile memory. Data retention supports post-experiment review of thermal profiles over up to 72 hours of continuous operation. For audit-trail requirements, optional RS-485 serial output (with Modbus RTU protocol) enables integration into centralized lab monitoring systems. The device supports manual calibration offset adjustment per ASTM E74-22 guidelines for thermometric verification, facilitating routine qualification per internal SOPs or ISO/IEC 17025 accreditation criteria.
Applications
- Temperature-controlled reaction support for rotary evaporation, reflux condensation, and low-temperature synthesis
- Cooling source for vacuum pumps, diffusion pumps, and electron microscopy cold stages
- Thermal conditioning of samples prior to rheological, viscometric, or calorimetric analysis
- Controlled environment for enzyme kinetics, protein folding studies, and cell culture incubation pre-chilling
- Calibration reference bath for thermometer and probe validation (per ISO 17025 Section 6.5)
- Support for cryogenic accessories such as medical cooling caps, therapeutic hypothermia blankets, and electrophysiology rigs
- Integration with freeze-dryers, chiller loops, and multi-stage purification systems in pilot-scale bioprocessing
FAQ
What is the minimum operating temperature and how quickly does it reach −20 °C from ambient?
The unit achieves −20 °C from 25 °C in approximately 45 minutes under no-load conditions; cooling rate varies with fluid volume, thermal mass of connected devices, and ambient room temperature.
Can this bath be used with ethylene glycol/water mixtures?
Yes—up to 30% v/v ethylene glycol is supported; higher concentrations may reduce pump efficiency and require viscosity verification.
Is external circulation flow rate adjustable?
Flow is fixed at ~12 L/min nominal; pressure-regulated output ensures consistent delivery across typical 3–5 m hose runs with ≤6 mm ID tubing.
Does the unit include NIST-traceable calibration documentation?
Factory calibration certificate is provided; NIST-traceable recalibration services are available through authorized Tianfeng service centers.
What maintenance intervals are recommended for optimal performance?
Compressor oil inspection every 24 months; annual cleaning of condenser coils and filter mesh; biannual verification of temperature sensor drift using reference thermometers.
