Julabo FPW55-SL Ultra-Low Temperature Heating and Cooling Circulating Bath

Overview

The Julabo FPW55-SL is a high-performance ultra-low temperature heating and cooling circulating bath engineered for precision thermal control in demanding laboratory and industrial applications. Based on dual-mode thermoelectric-compressor hybrid architecture—featuring a single-stage hermetic scroll compressor with R404A refrigerant and high-efficiency resistive heating elements—the FPW55-SL delivers stable, reproducible temperature regulation across an extended range of –60 °C to +100 °C. Its design adheres to DIN 12876-1 Class III (FL) safety requirements for flammable liquids, making it suitable for use with organic solvents, silicone oils, and other low-flashpoint heat transfer media. The unit integrates active thermal management strategies—including ACC (Adaptive Cold Control) for dynamic refrigerant expansion valve modulation and FP (Fractional Power) proportional cooling—to maintain consistent cooling capacity while minimizing energy consumption across the full operating span. A water-cooled condenser ensures stable performance under ambient conditions up to 40 °C, eliminating dependency on variable air-cooling efficiency.

Key Features

• VFD-backlit high-contrast LCD display showing real-time bath temperature, setpoint, external sensor reading, pump status, and alarm codes
• ICC (Intelligent Control Circuit) self-tuning algorithm automatically optimizes PID parameters for each thermal load and medium viscosity
• ATC3 three-point calibration support enables traceable temperature validation at –20 °C, 25 °C, and 80 °C using certified PT100 probes
• SmartPump™ technology dynamically adjusts motor speed and pressure output based on real-time fluid viscosity and system backpressure
• Integrated external PT100 input channel allows direct feedback control of process jackets, reactors, or inline systems with ±0.1 °C measurement accuracy
• Programmable temperature profiles with up to 6 segments × 60 steps per segment, supporting ramp-hold sequences with slope control from 0.1 to 10 °C/min
• Modular I/O architecture including standard RS232/RS485 ports and optional Profibus-DP interface for integration into SCADA or LIMS environments
• Removable front air grille and service-accessible condenser coil simplify preventive maintenance and comply with ISO 5171 cleaning protocols
• Dual-level liquid level monitoring: optical low-level detection plus redundant float switch for fail-safe dry-run protection
• Electromagnetic valve interface supports coordinated control of auxiliary cooling water supply and high-pressure booster pumps (HSP)

Sample Compatibility & Compliance

The FPW55-SL accommodates a wide range of heat transfer fluids—from deionized water and ethylene glycol/water mixtures to silicone oils (e.g., DC200 series) and fluorinated solvents—thanks to its chemically resistant stainless-steel reservoir (AISI 316L), EPDM-free wetted components, and sealed circulation path. Its DIN 12876-1 Class III (FL) certification confirms suitability for operation with flammable liquids up to flash point 60 °C. All electronic controls meet IEC 61000-6-3 (EMC emission) and IEC 61000-6-2 (immunity) standards. Firmware supports audit-trail logging per FDA 21 CFR Part 11 requirements when paired with compliant data acquisition software; temperature records include user ID, timestamp, setpoint, actual value, and deviation flags.

Software & Data Management

Julabo’s proprietary Wintherm® software (Windows-based, included) provides remote configuration, real-time graphing, and automated report generation in PDF or CSV format. Logged data includes bath temperature, external probe reading, pump RPM, compressor duty cycle, and alarm history—with configurable sampling intervals from 1 second to 60 minutes. Optional analog I/O module (0–10 V / 4–20 mA) enables closed-loop integration with PLCs or DCS systems for multi-zone thermal synchronization. All communication protocols implement CRC error checking and handshake confirmation to ensure data integrity during long-duration experiments.

Applications

This system is routinely deployed in polymer characterization labs for DSC sample prep and rheometer temperature control; in pharmaceutical development for accelerated stability testing per ICH Q1A(R3); in materials science for cryogenic tensile testing fixtures; and in analytical chemistry for column oven conditioning in HPLC and GC systems requiring sub-zero mobile phase pre-cooling. Its precise ramp-and-soak capability supports ASTM E2022 thermal cycling protocols, while its low-temperature hold stability meets ISO 17025 calibration lab requirements for reference thermometer verification.

FAQ

What is the minimum operating temperature achievable with aqueous solutions?
With 30% v/v ethylene glycol/water mixture, the FPW55-SL reliably maintains –55 °C; pure water is not recommended below 0 °C due to freezing risk.
Can the unit be operated in a fume hood?
Yes—its water-cooled condenser eliminates vented hot air, and all electrical enclosures are rated IP20 for indoor laboratory use.
Is external calibration documentation provided with shipment?
Each unit ships with a factory calibration certificate traceable to DKD/DAkkS-accredited standards, covering temperature uniformity, stability, and sensor linearity at three points.
How does SmartPump™ respond to changes in fluid viscosity?
Using integrated pressure transducers and motor current sensing, the controller modulates PWM drive frequency to sustain target flow rate within ±5% tolerance across viscosities from 1 to 100 mPa·s.
What safety interlocks prevent compressor damage during low-temperature operation?
The system enforces minimum evaporator superheat limits, oil return safeguards, and staged startup sequencing to avoid liquid slugging—fully compliant with EN 60335-1 Annex G for refrigeration safety.