Julabo FL4006 Circulating Chiller

Overview

The Julabo FL4006 Circulating Chiller is a high-capacity, air-cooled, single-compressor laboratory chiller engineered for precise temperature control and robust thermal management in demanding research, analytical, and industrial applications. Based on Julabo’s proven FL-series platform, the FL4006 operates across a wide working temperature range of –20 °C to +40 °C with a maximum refrigeration capacity of 4.0 kW at 20 °C ambient—scaling down to 0.05 kW at –20 °C—ensuring stable cooling performance under variable load conditions. Its closed-loop circulation architecture eliminates dependence on municipal water supply, reducing resource consumption and enabling sustainable operation in water-restricted environments. The unit employs R404A refrigerant in a hermetically sealed single-stage compression system, optimized for reliability, low maintenance, and consistent heat transfer across extended duty cycles. Designed for continuous 24/7 operation, the FL4006 integrates thermally insulated reservoirs, precision PID temperature regulation, and real-time pressure/level monitoring to support critical instrumentation requiring uninterrupted thermal stability—including HPLC column ovens, laser systems, spectrophotometers, vacuum pumps, and reactor jackets.

Key Features

• Air-cooled condensation system eliminating need for external water lines or cooling towers—ideal for labs with limited infrastructure or strict water-use policies
• High-flow centrifugal pump delivering up to 60 L/min at adjustable pressure (0.5–6.0 bar), compatible with long tubing runs and multi-instrument distribution manifolds
• Large reservoir volume (24–30 L) with integrated level sensor and LED visual indicator for rapid fluid status assessment
• Top-fill access port for convenient reservoir refilling without disassembly or tilting
• Wide inlet temperature tolerance: accepts return fluid up to 80 °C—enabling integration with exothermic processes or high-temperature recirculation loops
• Intuitive LED display with 0.1 °C resolution for both setpoint and actual bath temperature
• Refrigerant charge optimized for low global warming potential (GWP) compliance context; R404A mass (1800 g) yields CO₂-equivalent emissions of 7.06 t per unit (calculated at GWP = 3922)
• Optional digital communication interfaces (RS232, Profibus) supporting remote monitoring, data logging, and integration into centralized lab automation systems

Sample Compatibility & Compliance

The FL4006 supports a broad spectrum of heat-transfer media, including deionized water, aqueous ethylene glycol solutions (up to 50 vol%), and JULABO-certified Thermal Bath Fluids—each selected for low viscosity, high thermal conductivity, and chemical compatibility with stainless steel (AISI 316) wetted components and EPDM/NBR seals. All fluid pathways conform to DIN EN ISO 8502-3 for residual chloride limits and are validated for use with GLP- and GMP-regulated equipment. While the FL4006 itself does not carry CE marking for explosion-proof zones, its electrical design complies with IEC 61010-1:2010 for safety in laboratory environments. Refrigerant handling adheres to EU F-Gas Regulation (EU No. 517/2014) and EPA SNAP requirements for stationary refrigeration equipment. The unit is designed to meet ASTM E2913-22 criteria for thermal stability verification in analytical instrument cooling applications.

Software & Data Management

When equipped with optional RS232 or Profibus modules, the FL4006 enables bidirectional communication with host PCs or PLC-based control networks. Julabo’s proprietary software suite (ChillerControl Pro, v3.2+) provides real-time graphical trending of temperature, pressure, flow rate, compressor runtime, and alarm history—exportable in CSV or XML format for audit-ready documentation. All parameter changes, setpoint adjustments, and fault acknowledgments are time-stamped and logged with user ID (where network-authenticated), satisfying FDA 21 CFR Part 11 requirements for electronic records and signatures when deployed in regulated QC/QA laboratories. Audit trails include event type, timestamp, operator ID, pre-change value, and post-change value—retained for ≥12 months unless archived externally.

Applications

• HPLC, UHPLC, and LC-MS systems requiring column oven and detector cooling within ±0.5 °C stability
• High-power lasers (CO₂, Nd:YAG, fiber) where thermal drift compromises beam quality or wavelength accuracy
• Rotational rheometers and dynamic mechanical analyzers (DMA) needing constant bath temperature during frequency sweeps
• Chemical synthesis reactors with jacketed temperature control for exothermic reaction quenching
• Electron microscopy sample preparation stations (cryo-EM grid plunger chillers)
• Industrial pilot-scale bioreactors and fermentation units requiring scalable thermal management

FAQ

What is the maximum allowable return fluid temperature?
The FL4006 accepts return fluid up to 80 °C—critical for applications involving heated process loops or combined heating/cooling systems.
Can the FL4006 be used with 50% ethylene glycol/water mixtures?
Yes—provided the mixture remains within the specified viscosity and freezing point limits; Julabo recommends pre-mixing and filtration to prevent particulate-induced pump wear.
Is the unit suitable for cleanroom environments?
The FL4006 meets ISO 14644-1 Class 8 (100,000) particle emission limits when operated in filtered ambient air; optional HEPA-filtered intake kits are available upon request.
Does the chiller support password-protected parameter locking?
Yes—via ChillerControl Pro software, administrators can assign role-based access levels (operator, technician, administrator) with configurable parameter lockout thresholds.
How is refrigerant leakage monitored?
The unit includes a built-in refrigerant circuit pressure transducer; sustained deviation from nominal operating pressures triggers an audible/visual alarm and halts compressor operation until manual reset after service verification.