Julabo FC600S Circulating Chiller

Overview

The Julabo FC600S Circulating Chiller is a precision-engineered, air-cooled, integrated temperature control system designed for demanding laboratory and pilot-scale applications requiring stable, continuous thermal management between –10 °C and +80 °C. Built on Julabo’s decades of German engineering expertise in thermal instrumentation, the FC600S employs a single-stage hermetic compressor with R134a refrigerant and an integrated 1.2 kW electric heating element—enabling true dual-mode operation (cooling and heating) without external accessories. Its thermodynamic architecture follows the vapor-compression cycle, optimized for high reproducibility in heat exchange loops where consistent fluid temperature, flow rate, and pressure are critical—such as in rotary evaporators, spectrophotometers, laser systems, calorimeters, and reaction jacketed vessels. Unlike tap-water cooling, the FC600S eliminates water waste, reduces operational risk from leaks or inconsistent supply, and ensures compliance with modern lab sustainability protocols.

Key Features

• Integrated dual-function thermal control: simultaneous cooling (up to 500 W @ 20 °C) and heating (1.2 kW) within a single compact unit
• Air-cooled condenser design—no external water connection required; suitable for labs with limited utility infrastructure
• High-precision temperature stability of ±0.2 °C across the full operating range, supported by dual LED displays showing setpoint and actual bath/outlet temperature
• Adjustable outlet-to-inlet temperature differential (ΔT) control for optimized heat transfer in closed-loop systems
• Robust circulation pump delivering 22 L/min at 1.2 bar, compatible with both 8 mm and 12 mm ID tubing via included M16×1 male-threaded ports and dual quick-connect fittings
• Intuitive front-panel interface with 0.1 °C resolution setting and real-time monitoring; optional RS232 serial interface for remote command and data logging
• Analog output (0–10 V / 4–20 mA) for integration into centralized building management or process control systems (e.g., PLCs, SCADA)
• External Pt100 sensor input for precise, location-specific temperature feedback—critical for applications where bath temperature does not reflect process point temperature
• Reservoir volume of 6–8 L with transparent level indicator and top-fill port for rapid, spill-free refilling
• Low-noise operation (≤54 dB[A]) and energy-efficient design compliant with EU Ecodesign Directive (Regulation (EU) 2016/2281)

Sample Compatibility & Compliance

The FC600S is compatible with standard heat-transfer fluids including deionized water, 30–50% aqueous glycol solutions, and Julabo-certified thermostatic liquids (e.g., Julabo F12, F25). It is not intended for use with flammable, corrosive, or highly viscous media. The unit meets IEC 61010-1:2010 safety requirements for electrical equipment used in laboratory environments and carries CE marking. Its refrigerant charge (340 g R134a) complies with F-Gas Regulation (EU) No 517/2014, including mandatory leak-check intervals and technician certification requirements. For regulated environments, the optional RS232 interface supports basic audit-trail functionality when paired with validated third-party data acquisition software—aligning with GLP and GMP documentation expectations for temperature-critical processes.

Software & Data Management

While the FC600S operates autonomously via its embedded controller, it provides analog and digital interfaces for external integration. The 0–10 V / 4–20 mA analog output enables real-time transmission of measured outlet temperature and system status (e.g., compressor on/off, low-level alarm) to programmable logic controllers or distributed control systems. Optional RS232 communication (via standard DB9 connector) permits ASCII-based command/response protocol for remote setpoint adjustment, status polling, and event logging. Though Julabo does not ship proprietary PC software with the FC600S, its open protocol allows seamless integration with LabVIEW™, MATLAB®, or custom Python-based monitoring platforms using standard serial libraries. All parameter changes and alarms are timestamped internally and visible on the dual LED display—supporting traceability in non-validated workflows.

Applications

• Condenser cooling for rotary evaporation (RotaEvap) under vacuum, maintaining consistent solvent recovery efficiency
• Temperature stabilization of UV-Vis, FTIR, and fluorescence spectrophotometers to minimize thermal drift in optical path length and detector response
• Thermal regulation of high-power lasers (e.g., DPSS, CO₂) where coolant temperature directly affects beam stability and diode lifetime
• Controlled cooling/heating of jacketed glass reactors during exothermic or endothermic synthesis (e.g., Grignard, hydrogenation)
• Calibration support for DSC, TGA, and rheometers requiring precise, repeatable thermal ramping and isothermal holds
• Pilot-scale chromatography systems (HPLC, SFC) where column oven and detector cell temperatures must remain synchronized
• Environmental test chambers requiring auxiliary cold/hot fluid feed for extended temperature range extension

FAQ

What is the maximum allowable inlet fluid temperature?
The FC600S supports return fluid temperatures up to 80 °C—enabling compatibility with heated recirculation loops and high-temperature reactor jackets.
Can the FC600S operate continuously at –10 °C ambient?
No. The unit requires an ambient environment between 5 °C and 40 °C; operation below 5 °C may impair compressor oil viscosity and refrigerant circulation efficiency.
Is the reservoir volume fixed or variable?
The internal reservoir holds 6–8 L depending on fill level and expansion; the unit includes a calibrated sight gauge and low-level cutoff switch for automatic pump shutdown.
Does the FC600S support external temperature control via a process sensor?
Yes—via the optional Pt100 input, the controller can regulate based on external probe feedback rather than bath temperature alone, improving accuracy for process-critical applications.
What maintenance is required for long-term reliability?
Annual visual inspection of condenser coils (for dust accumulation), biannual verification of refrigerant charge integrity (using manifold gauge set), and periodic cleaning of the reservoir interior with isopropyl alcohol—per Julabo Service Bulletin FC-2022-03.