Julabo CF30 Compact Heating and Cooling Circulating Bath

Overview

The Julabo CF30 Compact Heating and Cooling Circulating Bath is an engineered thermal management solution designed for precision temperature control in laboratory and analytical applications requiring both heating and refrigeration capabilities within a minimal footprint. Based on closed-loop liquid circulation thermodynamics, the CF30 utilizes a high-efficiency air-cooled single-stage compressor with R134a refrigerant—selected for its low toxicity, non-flammability, and compliance with modern environmental regulations—and a 2 kW resistive heating system to achieve rapid, bidirectional thermal response across a wide operating range of –30 °C to +150 °C. Its microprocessor-based PID temperature controller delivers exceptional stability of ±0.03 °C, making it suitable for applications demanding high reproducibility, such as calibration of temperature-sensitive sensors, conditioning of optical components, or thermal pre-treatment of polymer samples prior to rheological or DSC analysis. The unit complies fully with DIN 12876-1 Class III (FL) safety requirements for flammable liquid handling, enabling safe operation inside fume hoods without side exhaust vents—a critical feature for confined lab spaces and multi-unit installations.

Key Features

• Compact footprint (24 × 46 × 40 cm) optimized for benchtop or fume hood integration
• DIN 12876-1 Class III (FL) certified construction with stainless steel and chemically resistant plastic wetted parts
• Front-mounted drain port and ergonomic spill-resistant keypad with large, high-contrast LED display (0.1 °C resolution)
• Adjustable overtemperature alarm via dedicated rotary dial; automatic shutdown upon threshold breach
• Integrated external circulation pump (15 L/min flow, 0.35 bar pressure) with M16×1 female thread outlet and dual quick-connect fittings (8 mm / 12 mm ID)
• RS232 serial interface for remote monitoring, parameter logging, and integration into automated lab systems
• Air-cooled, single-stage compressor architecture eliminating need for chilled water supply or ventilation ducting

Sample Compatibility & Compliance

The CF30 is compatible with a broad range of heat transfer fluids—including water, water-glycol mixtures, silicone oils, and low-viscosity synthetic heat transfer media—enabling use across diverse thermal protocols. All fluid-contact surfaces are constructed from electropolished 316 stainless steel and FDA-compliant polypropylene, ensuring long-term resistance to corrosion and leaching. The device meets DIN 12876-1 Class III (FL) certification for operation with flammable liquids up to flash point 60 °C, supporting GLP-compliant workflows where traceability and hazard mitigation are essential. While not inherently 21 CFR Part 11 compliant, audit trail functionality can be implemented via third-party data acquisition software interfaced through RS232, satisfying basic GMP documentation requirements for temperature-controlled process validation.

Software & Data Management

The CF30 operates autonomously via its embedded firmware but supports ASCII protocol-based communication over RS232 for real-time telemetry and command execution. Compatible with standard terminal emulators or custom LabVIEW/Python scripts, users may log temperature setpoints, actual bath readings, pump status, and alarm events at configurable intervals. Though no proprietary software is bundled, Julabo provides detailed command reference documentation—including SCPI-like syntax for read/write operations—to facilitate integration into centralized laboratory information management systems (LIMS) or electronic lab notebooks (ELN). Timestamped event logs (e.g., overtemperature triggers, power cycles) are retained in volatile memory and can be exported for quality assurance review.

Applications

• Thermal conditioning of HPLC columns, viscometers, and spectrophotometer cuvettes
• Temperature stabilization of laser diodes, photodetectors, and interferometric optics
• Controlled cooling/heating of small-volume reaction vessels in synthetic chemistry
• Calibration of thermocouples, RTDs, and infrared thermometers against NIST-traceable references
• Pre-conditioning of polymer films and composites prior to tensile or DMA testing
• Supporting external jacketed reactors, calorimeters, or vacuum desiccators via external loop connection

FAQ

What is the minimum recommended fluid volume for stable operation?
The bath requires ≥3.0 L of heat transfer fluid for optimal thermal mass and sensor immersion; the nominal fill volume is 3.5 L.
Can the CF30 operate continuously at –30 °C ambient temperature?
No—the specified ambient operating range is 5–40 °C per DIN 12876-1; operation below 5 °C may impair compressor oil viscosity and condensation management.
Is the RS232 interface optically isolated?
No—electrical isolation is not provided; users deploying in electrically noisy environments should implement external isolation modules.
Does the unit support programmable ramp-soak profiles?
No—CF30 features fixed-setpoint control only; profile-based sequencing requires external programmable logic controllers or PC-based software.
Are replacement refrigerant charges field-serviceable?
Refrigerant recharging must be performed by Julabo-certified technicians using calibrated recovery equipment to maintain environmental compliance and warranty validity.