Julabo FL Series Circulating Chillers & Temperature Control Units

Overview

The Julabo FL Series circulating chillers and temperature control units are precision-engineered refrigeration systems designed for stable, continuous thermal management in demanding laboratory and industrial environments. Based on vapor-compression refrigeration cycles with optimized scroll or reciprocating compressors (model-dependent), the FL Series delivers accurate temperature regulation across a broad operating range of –20 °C to +40 °C. These units operate as closed-loop external circulation systems—pumping conditioned fluid through external equipment such as spectrometers, laser sources, vacuum pumps, rotary evaporators, or material testing rigs. Their robust architecture supports high thermal loads and variable flow conditions while maintaining ±0.5 °C temperature stability under dynamic load conditions—a critical requirement for reproducible analytical workflows and process validation.

Key Features

• Wide operational temperature span: –20 °C to +40 °C, with consistent stability of ±0.5 °C across the full range
• Scalable refrigeration capacity: 22 models available, from 0.3 kW to 20 kW (FL20006), accommodating applications from benchtop instrumentation to large-scale pilot plants
• High-flow performance: Up to 80 L/min volumetric flow rate with pressure delivery up to 6.0 bar, ensuring reliable circulation even through long tubing runs or high-resistance heat exchangers
• Top-fill reservoir design: Simplifies fluid replenishment and minimizes spill risk during maintenance or coolant changes
• Integrated visual indicators: Continuous liquid level monitoring standard across all models; digital pressure display included on FL1201 and higher variants
• Large reservoir volume: Up to 80 L internal capacity reduces frequency of top-ups and improves thermal inertia for improved temperature homogeneity
• High-temperature inlet tolerance: Accepts return fluid up to 80 °C—enabling compatibility with exothermic processes or high-heat-load instruments without pre-cooling stages
• Dual cooling configurations: Air-cooled (FL) and water-cooled (FLW) variants allow installation flexibility depending on ambient conditions and facility infrastructure

Sample Compatibility & Compliance

The FL Series is compatible with a wide range of heat transfer fluids, including deionized water, aqueous ethylene glycol mixtures (up to 50% v/v), and Julabo-certified synthetic heat transfer media such as Thermal G®—all selected for low viscosity, high thermal conductivity, and long-term chemical stability. Units comply with IEC 61000-6-3 (EMC emission standards) and IEC 61000-6-2 (immunity), and meet CE marking requirements under the EU Machinery Directive 2006/42/EC and Low Voltage Directive 2014/35/EU. For regulated environments, optional accessories support GLP/GMP compliance—including password-protected parameter locking, audit trail logging (via optional software), and configurable alarm thresholds aligned with ISO/IEC 17025 calibration management protocols.

Software & Data Management

While the FL Series operates via intuitive front-panel controls with LED display and tactile keypad, optional PC connectivity (RS232 or USB) enables remote monitoring and parameter configuration using Julabo’s LabView-compatible communication protocol. Third-party SCADA or LIMS integration is supported through Modbus RTU (via optional interface module). All models store runtime logs—including compressor cycles, temperature setpoint deviations, and alarm history—for traceability. When paired with Julabo’s optional ChillerControl software (sold separately), users gain access to real-time trend visualization, automated report generation, and exportable CSV data files suitable for 21 CFR Part 11–compliant documentation workflows.

Applications

• Laboratory instrumentation cooling: NMR spectrometers, X-ray diffractometers, mass spectrometers, and high-power lasers requiring precise thermal stabilization
• Process support in R&D: Temperature-controlled jacketed reactors, distillation columns, and crystallization studies
• Quality control labs: Maintaining constant bath temperatures for viscometers, density meters, and calorimeters per ASTM D445, ISO 3104, or USP
• Industrial pilot lines: Thermal conditioning of extruders, coating systems, or semiconductor wafer handling stations
• Environmental simulation: Providing stable cold/hot fluid supply to climate chambers or thermal shock test setups

FAQ

What fluid types are approved for use with the FL Series?
Deionized water, water/ethylene glycol solutions (≤50% v/v), and Julabo-recommended synthetic fluids such as Thermal G® are fully compatible. Avoid chlorinated solvents, oils, or non-approved glycols due to potential seal degradation or corrosion.
Can the FL Series be integrated into a building management system (BMS)?
Yes—via optional Modbus RTU interface module, enabling read/write access to setpoints, status flags, and alarms for centralized HVAC or facility monitoring platforms.
Is remote firmware update supported?
Firmware updates require local connection via USB and Julabo’s official update utility; over-the-air updates are not supported for security and regulatory integrity reasons.
What is the maximum allowable ambient temperature for operation?
Standard air-cooled models (FL) are rated for continuous operation at ambient temperatures up to 35 °C. For environments exceeding this, water-cooled variants (FLW) or auxiliary ventilation are recommended.
Do FL units support dual-temperature zone control?
No—the FL Series provides single-loop temperature control. For multi-zone applications, multiple units or Julabo’s more advanced PRESTO or F26 models with dual-circuit capability are recommended.