BUCHI F-125 Circulating Chiller

Overview

The BUCHI F-125 Circulating Chiller is an integrated, water-cooled thermal management system engineered for precision temperature control in demanding laboratory applications—particularly rotary evaporation, vacuum distillation, and condenser cooling. Designed and manufactured in Switzerland, the F-125 operates on a closed-loop refrigeration cycle using environmentally compliant R134a refrigerant and delivers stable cooling performance across a regulated range of −10 °C to +25 °C. Its thermodynamic architecture enables continuous-duty operation with high reproducibility, supporting process-critical workflows where thermal drift or intermittent cooling could compromise solvent recovery efficiency, sample integrity, or vacuum stability. Unlike ambient-air-cooled chillers, the F-125’s water-cooled condenser minimizes heat rejection into the laboratory environment—reducing HVAC load and improving overall energy efficiency by up to 75% compared to legacy systems operating under equivalent thermal loads.

Key Features

• Integrated design with built-in reservoir (11 L), circulation pump, and digital controller—no external components required for standard deployment.
• High-flow circulation system delivering 11 L/min at 0.6 bar pressure, ensuring uniform coolant distribution to multiple instruments or large-surface condensers.
• Digital display with 0.1 K resolution and intuitive interface for real-time monitoring and setpoint adjustment.
• Robust mechanical construction (100 kg mass, steel-reinforced chassis) optimized for vibration-damped placement adjacent to rotary evaporators or vacuum manifolds.
• Compliant overvoltage category II rating and dual-voltage compatibility (115 VAC / 230 VAC ±10%, 50/60 Hz) for global laboratory integration.
• Optimized thermal coupling with BUCHI vacuum controllers and R-300/R-220 rotavaps via standardized communication protocols (RS485/Modbus RTU), enabling synchronized setpoint coordination and safety interlocks.

Sample Compatibility & Compliance

The F-125 is compatible with all standard laboratory coolant fluids—including deionized water, water-glycol mixtures (up to 30% v/v), and low-conductivity aqueous solutions—within its operational temperature window. It meets IEC 61010-1:2010 safety requirements for electrical equipment used in laboratory environments and conforms to electromagnetic compatibility standards EN 61326-1:2013. While not a regulated medical device, its stable thermal output supports GLP-compliant evaporation processes when paired with validated BUCHI instrumentation; audit trails and parameter logging are enabled through optional integration with BUCHI Labx® software.

Software & Data Management

The F-125 supports bidirectional communication with BUCHI Labx® Laboratory Software via RS485 interface, allowing centralized configuration, remote monitoring, and automated data capture of temperature setpoints, actual bath temperatures, and operational status flags. When deployed in networked lab environments, Labx® can correlate chiller performance metrics with concurrent evaporation parameters (e.g., bath temperature, vacuum level, rotation speed) to support method validation and process documentation per ISO/IEC 17025 and FDA 21 CFR Part 11 requirements (with appropriate user access controls and electronic signature modules). No onboard data storage is provided; all logging is managed externally through the host software platform.

Applications

• Routine and preparative rotary evaporation requiring precise condenser cooling across volatile solvent gradients (e.g., dichloromethane, ethyl acetate, hexane).
• Vacuum-assisted distillation setups where thermal stability directly impacts fraction purity and boiling point accuracy.
• Long-duration concentration protocols (>8 h) necessitating uninterrupted cooling without manual intervention or ice replenishment.
• Multi-instrument cooling networks—e.g., simultaneous supply to a rotavap condenser, cold trap, and reflux jacket—leveraging consistent flow and pressure regulation.
• Environmental testing chambers or calorimetry stations requiring auxiliary low-temperature stabilization within defined thermal envelopes.

FAQ

What is the minimum ambient temperature for safe operation of the F-125?

The unit is rated for continuous operation in ambient environments between +10 °C and +32 °C. Operation below +10 °C may impair refrigerant circulation and compressor lubrication.
Can the F-125 be used with flammable coolants such as pure ethanol?

No. Only non-flammable, low-conductivity coolants meeting BUCHI’s Material Safety Data Sheet (MSDS) specifications are permitted. Flammable liquids pose fire and compatibility risks with seals and pump components.
Is the reservoir volume sufficient for unattended overnight operation?

Yes—the 11 L capacity, combined with continuous recirculation and thermal buffering, supports stable operation over extended cycles when paired with properly insulated tubing and standard lab condenser loads.
Does the F-125 support external temperature feedback control (e.g., from a probe in the condenser jacket)?

Not natively. Temperature regulation is based on internal reservoir sensor feedback. External PID control requires third-party integration via analog 0–10 V or 4–20 mA interfaces (not included).
How often does the R134a refrigerant require servicing or replacement?

Under normal sealed-system operation and absence of leaks or physical damage, the refrigerant charge is maintenance-free for the service life of the unit. Annual visual inspection of hoses, fittings, and compressor oil level is recommended per BUCHI Preventive Maintenance Guidelines.