Julabo FL4003 Circulating Chiller

Overview

The Julabo FL4003 Circulating Chiller is a high-capacity, air-cooled laboratory chiller engineered for precision temperature control and robust thermal management in demanding research, analytical, and industrial applications. Based on vapor-compression refrigeration with a single-stage R404A system, the FL4003 delivers stable cooling across a wide operating range of –20 to +40 °C, with temperature stability maintained within ±0.5 °C under continuous load. Its 4.0 kW nominal refrigeration capacity at 20 °C—scalable to up to 20 kW across the FL-series platform—enables reliable heat extraction from high-power instrumentation including NMR spectrometers, laser systems, plasma sources, rotary evaporators, and vacuum pumps. Designed for integration into closed-loop cooling circuits, the unit eliminates dependency on municipal water cooling, significantly reducing water consumption and associated disposal costs while complying with modern sustainability and lab safety protocols.

Key Features

• Air-cooled condensation system eliminates need for external water supply or drainage infrastructure
• Large-volume reservoir (24–30 L) minimizes refilling frequency and enhances thermal inertia for improved stability
• High-flow, pressure-regulated circulation pump delivering up to 40 L/min at adjustable pressure (0.5–3.0 bar)
• Top-fill design with integrated level indicator simplifies fluid maintenance and reduces spill risk
• LED digital display with 0.1 °C resolution for both setpoint and actual bath temperature
• Maximum allowable return fluid temperature of 80 °C supports integration with exothermic processes and high-temperature equipment interfaces
• Compatible with aqueous, glycol–water (up to 50% v/v), and JULABO-certified Thermal Bath Fluids for extended low-temperature operation and corrosion resistance
• Standard G3/4″ male threaded pump ports with two included 3/4″ ID quick-connect fittings for rapid system integration
• Optional RS232 serial interface and Profibus connectivity enable remote monitoring, logging, and integration into centralized lab automation platforms

Sample Compatibility & Compliance

The FL4003 is designed for use with non-aggressive, non-flammable heat transfer fluids meeting ISO 8502-1 purity standards for laboratory circulation systems. It conforms to IEC 61000-6-3 (EMC emission limits) and IEC 61000-6-2 (immunity requirements), ensuring electromagnetic compatibility in shared instrument environments. While not intrinsically rated for hazardous locations, its sealed refrigeration circuit and absence of ignition sources permit safe operation in standard laboratory Class 1, Division 1 spaces per NEC Article 500. The unit complies with EU Regulation (EU) No 517/2014 on fluorinated greenhouse gases, including mandatory leak-checking intervals and certified refrigerant handling documentation. All electrical components meet CE, UL 61010-1, and CSA C22.2 No. 61010-1 safety standards. Its refrigerant charge (1800 g R404A) corresponds to 7.06 t CO₂-equivalent emissions—fully documented for environmental impact reporting under ISO 14067.

Software & Data Management

The FL4003 supports ASCII-based command protocols over RS232 for integration with custom LabVIEW, Python, or MATLAB control scripts. When equipped with optional Profibus DP-V1, it functions as a slave node in Siemens S7 or Rockwell ControlLogix networks, enabling real-time temperature setpoint updates, pump status feedback, and alarm event triggering. All operational parameters—including current temperature, pump speed, compressor run time, and error codes—are accessible via serial query. While the base unit does not include onboard data logging, third-party SCADA systems can capture timestamped readings at user-defined intervals (≥1 s). Audit trails generated through external controllers may be configured to satisfy GLP/GMP requirements, including electronic signatures and 21 CFR Part 11–compliant data integrity controls when deployed with validated software layers.

Applications

• Cooling of high-field NMR and MRI magnet cryocoolers requiring stable sub-ambient temperatures and high thermal mass buffering
• Thermal regulation of semiconductor fabrication tools, including plasma etchers and PVD sputtering chambers
• Condenser cooling for large-scale rotary evaporation and fractional distillation setups
• Temperature stabilization of high-power laser diodes, fiber amplifiers, and optical parametric oscillators
• Process cooling in pilot-scale chemical reactors and calorimetry systems where precise ΔT control is critical
• Support of automated liquid handling workstations and high-throughput screening platforms requiring consistent thermal environment

FAQ

What is the maximum allowable inlet fluid temperature?
The FL4003 accepts return fluid at temperatures up to 80 °C, making it suitable for integration with equipment generating significant waste heat.
Can the unit operate continuously at –20 °C ambient temperature?
No—the recommended ambient operating range is 5–40 °C; operation below 5 °C requires optional low-ambient kit (Part No. 9663050) to prevent compressor oil viscosity issues.
Is R404A refrigerant being phased out, and are alternatives available?
Yes—R404A is subject to EU F-Gas phase-down; Julabo offers retrofit-compatible R449A upgrade kits (subject to service technician validation) with ~65% lower GWP.
Does the FL4003 support external temperature sensors for process feedback control?
Yes—via optional PT100 input module (Accessory Kit 9663060), enabling cascade control using an external probe placed directly in the application loop.
How often should the refrigerant circuit be inspected for leaks?
Per EU F-Gas Regulation, units with ≥3 kg refrigerant charge require annual leak checks by certified personnel; the FL4003’s 1.8 kg charge mandates inspection every 24 months.