Julabo FPW90-SL-150C Ultra-Low Temperature Heating and Cooling Circulator

Overview

The Julabo FPW90-SL-150C is a dual-stage, ultra-low temperature heating and cooling circulator engineered for demanding laboratory and industrial applications requiring precise thermal control across an exceptionally wide operating range—from −90 °C to +150 °C. Unlike single-stage systems limited by thermodynamic constraints at cryogenic temperatures, this unit employs a cascade refrigeration architecture: a primary R404A circuit cools the secondary R23 circuit, enabling stable operation below −70 °C while maintaining high reproducibility and low temperature drift. Its design meets DIN 12876-1 Class III (FL) safety requirements for flammable liquid handling, making it suitable for use with organic solvents in reaction calorimetry, material testing, and low-temperature synthesis. The integrated SmartPump™ technology dynamically adjusts motor output based on fluid viscosity and system backpressure—critical when circulating high-viscosity heat transfer fluids (e.g., silicone oils or ethylene glycol/water blends) across extended external loops. Thermal stability of ±0.05 °C is maintained under dynamic load conditions via ICC (Intelligent Control Concept) auto-tuning and TCF (Temperature Compensation Function), which compensates for ambient fluctuations and sensor thermal lag.

Key Features

• VFD + LCD-backlit dual display for simultaneous monitoring of bath temperature, setpoint, external sensor reading, pump status, and alarm history
• Waterproof membrane keypad with tactile feedback for reliable operation in humid or solvent-rich environments
• ATC3 three-point calibration support for traceable temperature validation using certified Pt100 probes (ISO/IEC 17025-compliant workflows)
• Integrated external Pt100 input channel enabling direct closed-loop control of remote process jackets or reactor vessels
• RS232 standard interface with ASCII protocol; optional RS485 or Profibus-DP modules for integration into SCADA or LIMS platforms
• 6 programmable temperature profiles (each up to 60 steps), supporting ramp-hold-cool sequences for ASTM D341 viscosity-temperature studies or ICH Q5C stability protocols
• SmartPump™ variable-speed circulation with pressure and suction monitoring (0.2–0.4 bar suction, 0.4–0.7 bar discharge) to maintain laminar flow across complex external manifolds
• Removable front air grille and rear-access condenser panels facilitate routine maintenance without disassembly
• Dual refrigerant system with documented GWP values (R404A: 3922; R23: 14800) and CO₂-equivalent mass reporting per EU F-Gas Regulation (EU) No 517/2014

Sample Compatibility & Compliance

The FPW90-SL-150C accommodates a broad spectrum of heat transfer media—including water, 50% aqueous glycol, silicone oils (e.g., DC200 series), and specialized low-temperature fluids such as Therminol LR. Its stainless-steel bath chamber and fluoropolymer-sealed pump head resist corrosion from aggressive solvents. The unit conforms to DIN 12876-1 Class III (FL) for use with flammable liquids up to flash point 60 °C, and incorporates redundant safety layers: low-level detection with automatic heater cutoff, overtemperature shutdown (mechanical and electronic), and compressor discharge temperature monitoring. For regulated environments, its firmware supports audit-trail-capable logging (when paired with Julabo’s LabSoft software), aligning with FDA 21 CFR Part 11 requirements for electronic records and signatures. All temperature-critical components are calibrated against NIST-traceable standards, and full calibration certificates (including uncertainty budgets) are available upon request.

Software & Data Management

Julabo LabSoft v4.x provides secure, time-stamped data acquisition via RS232 or optional Ethernet gateway. It enables real-time plotting of up to four channels (bath temperature, external probe, pump power, refrigeration load), configurable alarm notifications (email/SMS via SMTP), and export to CSV or PDF formats compliant with GLP documentation standards. The software supports IQ/OQ protocol templates aligned with ISO/IEC 17025 and ASTM E2500, facilitating instrument qualification in pharmaceutical QC labs. Raw data files include metadata tags (operator ID, method name, environmental conditions), ensuring full traceability. When deployed with optional analog I/O modules (0–10 V or 4–20 mA), the circulator can serve as a slave device in master-controlled thermal systems—e.g., synchronizing jacket temperature with DSC furnace ramps or bioreactor cooling profiles.

Applications

• Low-temperature reaction kinetics studies in synthetic organic chemistry (e.g., lithiation, Grignard additions below −78 °C)
• Calibration of cryogenic sensors and infrared detectors requiring stable thermal sinks
• Material science testing: coefficient of thermal expansion (CTE) measurements per ASTM E831, brittle-to-ductile transition analysis
• Pharmaceutical stability chambers simulating ICH Q1A–Q1E long-term and accelerated storage conditions
• External cooling of high-power lasers, NMR preamplifiers, or vacuum pump chillers
• Integration into automated synthesis platforms (e.g., Chemspeed, Uniqsis) via digital or analog control signals

FAQ

What is the minimum external loop volume this unit can stabilize?
The FPW90-SL-150C achieves optimal stability with external volumes ≥5 L; for smaller loops (<2 L), optional PID parameter adjustment or external buffer tanks are recommended to dampen thermal inertia.
Can it operate continuously at −90 °C?
Yes—continuous operation at −90 °C is supported under nominal ambient conditions (20–25 °C, ≤60% RH); sustained sub−80 °C operation requires adequate ventilation and clearance (≥30 cm rear/side) to dissipate condenser heat.
Is remote firmware update possible?
Firmware updates require local USB connection using Julabo’s certified update utility; no over-the-air (OTA) capability is implemented for security and regulatory compliance reasons.
How does the dual-refrigerant cascade system improve efficiency versus single-stage units?
By decoupling high-pressure R23 operation from ambient-temperature condensation, the cascade architecture avoids excessive compression ratios, reducing mechanical stress, energy consumption, and oil carryover—extending service intervals beyond 12,000 operating hours.
Does the unit meet UL/CSA electrical safety standards?
It carries CE marking per EMC Directive 2014/30/EU and Low Voltage Directive 2014/35/EU; UL/cULus certification is available under model suffix “-UL” (consult factory for regional variant availability).