Julabo FL7006 Circulating Chiller

Overview

The Julabo FL7006 Circulating Chiller is a high-capacity, air-cooled laboratory chiller engineered for precision temperature control in demanding continuous-duty applications. Designed and manufactured in Germany, it operates on the principle of vapor-compression refrigeration using a single-stage hermetic compressor and R404A refrigerant—optimized for stable thermal management across wide ambient conditions (5–40 °C). Its core function is to maintain a constant bath temperature by circulating conditioned fluid through external equipment—such as spectrometers, NMR consoles, laser systems, or reactor jackets—while rejecting heat via an integrated finned-tube condenser and axial fans. Unlike tap-water cooling, the FL7006 eliminates water waste, reduces operational risk from supply fluctuations or contamination, and enables precise thermal setpoints within ±0.5 °C stability over its full operating range of –20 °C to +40 °C. With a maximum refrigeration capacity of 7 kW at 20 °C and a robust 60 L/min pump flow, it serves as a central thermal management unit for multi-instrument labs or pilot-scale industrial processes.

Key Features

• High-power air-cooled design with 7 kW nominal refrigeration output (derated to 1.55 kW at –20 °C), enabling operation without chilled water infrastructure or dedicated ventilation ducting
• Wide temperature range (–20 to +40 °C) supported by optimized refrigerant charge (3000 g R404A) and low-temperature expansion valve calibration
• Precision temperature stability of ±0.5 °C, achieved via PID-controlled electronic expansion valve, dual-sensor feedback loop (bath & return line), and insulated reservoir
• High-flow, pressure-variable circulation pump (60 L/min max, 0.5–6.0 bar) with G1¼” BSP male ports and 1″ internal hose ID for minimal system pressure drop
• Large reservoir volume (39–47 L) with integrated level indicator and visual fill port on top panel for safe, tool-free replenishment
• Robust mechanical architecture: stainless-steel reinforced frame, vibration-damped compressor mounting, and IP54-rated electrical cabinet for long-term reliability in shared lab environments
• Return fluid tolerance up to 80 °C—critical for integration with exothermic reactors or high-power lasers where hot return lines are unavoidable

Sample Compatibility & Compliance

The FL7006 is compatible with aqueous coolants including deionized water, water/ethylene glycol mixtures (up to 50% v/v), and JULABO-certified Thermal G series heat transfer fluids. All wetted components—including pump head, reservoir liner, and heat exchanger—are constructed from corrosion-resistant stainless steel (AISI 304) and EPDM seals, ensuring compatibility with pH-neutral to mildly alkaline solutions. The unit complies with EU directives 2014/68/EU (PED), 2012/19/EU (WEEE), and 2011/65/EU (RoHS). Refrigerant handling conforms to EN 378-1:2016 for stationary refrigeration systems. While not intrinsically rated for hazardous areas, its design supports integration into ISO/IEC 17025-accredited laboratories and meets baseline requirements for GLP-compliant thermal validation protocols when paired with external calibrated thermistors and audit-trail-enabled controllers.

Software & Data Management

Standard RS232 interface enables bidirectional communication with host PCs or PLCs for remote setpoint adjustment, real-time temperature logging, and alarm status polling. Optional Profibus DP-V1 integration supports deterministic cyclic data exchange in industrial automation environments (e.g., Siemens S7-based control systems). Julabo’s proprietary WinControl software (Windows-compatible) provides graphical trend analysis, event-triggered data export (CSV), and password-protected parameter locking—supporting basic 21 CFR Part 11 readiness when deployed with Windows domain authentication and file-level write protection. No onboard data storage is included; all logging is host-dependent. Firmware updates are performed via serial connection using Julabo’s certified update utility, with version rollback capability and checksum verification.

Applications

• Continuous cooling of high-power analytical instruments: FTIR spectrometers, X-ray diffractometers, ICP-MS plasma interfaces, and MALDI-TOF laser sources
• Temperature stabilization of jacketed glass reactors (10–50 L scale) during exothermic synthesis or cryogenic crystallization
• Thermal conditioning of semiconductor process tools requiring stable coolant inlet temperature under variable load
• Support for calorimetry systems (e.g., DSC, ITC) where low-noise, drift-free temperature ramps are essential
• Integration into HVAC bypass loops for environmental test chambers requiring auxiliary heat rejection

FAQ

What is the maximum allowable return fluid temperature?
The FL7006 accepts return fluid up to 80 °C, making it suitable for applications involving high-temperature process loops or equipment with significant thermal inertia.
Can the unit operate unattended for extended periods?
Yes—it features automatic low-level shutdown, overtemperature cutout, dry-run protection, and compressor high-pressure safety switch, meeting IEC 61000-6-2 EMC immunity standards for continuous 24/7 operation.
Is glycol mixture required for sub-zero operation?
For sustained operation below 0 °C, a water/glycol blend (typically 30–40% v/v) is mandatory to prevent freezing and ensure adequate viscosity for pump performance.
Does the FL7006 support external temperature sensors?
Yes—via optional PT100 input (JULABO accessory part no. 9666090), allowing direct feedback control from the process point rather than the chiller bath.
How often does the refrigerant require servicing?
Under normal operation and sealed-system integrity, R404A does not require periodic replenishment; leak detection and recharge should only occur following verified pressure loss or performance degradation confirmed by subcooling/superheat diagnostics.