Julabo CD-201FS Magnetic Stirring Circulating Bath Chiller

Overview

The Julabo CD-201FS Magnetic Stirring Circulating Bath Chiller is an engineered thermal management platform designed for precision temperature control in demanding laboratory applications requiring simultaneous heating, cooling, stirring, and fluid circulation. Based on a dual-mode thermoelectric-compressor hybrid system, it delivers stable thermal regulation across a wide operating range of −20 °C to +150 °C — enabling use with water, silicone oil, ethylene glycol mixtures, and other compatible heat transfer fluids. Its core architecture integrates a high-efficiency stainless-steel heating coil, a compact vapor-compression refrigeration circuit with optimized condenser airflow, and a brushless DC magnetic stirrer capable of continuous operation at speeds from 100 to 1600 rpm. The system employs a cascaded PID1 + ACC (Adaptive Cascade Control) algorithm that dynamically adjusts proportional, integral, and derivative parameters based on real-time thermal load and ambient conditions — ensuring minimal overshoot and rapid settling time. Absolute temperature calibration (ATC) functionality allows users to perform traceable in-situ calibration without external reference equipment, supporting compliance with ISO/IEC 17025 internal verification requirements.

Key Features

• High-precision temperature stability of ±0.03 °C across the full operational range, validated per DIN 12876-1 Class III (FL) safety certification for flammable liquid environments
• Integrated magnetic stirrer with adjustable speed (100–1600 rpm), single-position configuration, and torque-consistent performance under varying viscosity and temperature conditions
• Intelligent dual-circulation design: selectable internal recirculation (via rotatable outlet nozzle) and external circulation (M16×1 male port) for integration with reactors, jacketed vessels, or analytical instrumentation
• Ergonomic bath cover featuring pyramidal condensate return geometry and thermo-insulated polymer handle — prevents finger contact with hot surfaces and ensures condensed vapor returns directly to the bath
• Modular thermal subsystems: corrosion-resistant stainless-steel heating elements, service-accessible condenser grille, and space-efficient coil layout maximizing usable bath volume (3–4 L)
• Comprehensive safety architecture including overtemperature cutoff, low-fluid-level detection with audible/visual alarm and automatic power disconnection, and IEC 61010-compliant lockable power interface
• USB interface compliant with CDC ACM class protocol, enabling bidirectional communication with Julabo’s LabWorldSoft™ for remote parameter setting, real-time data logging, and GLP-compliant audit trail generation

Sample Compatibility & Compliance

The CD-201FS is validated for use with aqueous solutions, mineral oils, silicone-based heat transfer media, and glycol–water mixtures up to 60 % concentration. Its Class III (FL) certification per DIN 12876-1 confirms suitability for operation with flammable liquids at elevated temperatures, provided appropriate ventilation and containment protocols are observed. Electromagnetic compatibility meets EN 61326-1 for laboratory environments, while electrical safety conforms to EN 61010-1:2010+A1:2019. The unit complies with EU directives 2011/65/EU (RoHS) and 2012/19/EU (WEEE). All firmware and software components support FDA 21 CFR Part 11–aligned user access controls, electronic signatures, and immutable data export when used with LabWorldSoft™ v4.2 or later.

Software & Data Management

LabWorldSoft™ provides native USB connectivity for configuration, monitoring, and automated data capture. Users may define multi-segment temperature ramps, synchronize stirring profiles with thermal programs, and export timestamped CSV files containing temperature, setpoint, stirring speed, and alarm status. Audit trails record operator ID, parameter changes, and system events with SHA-256 hashing. Data integrity is preserved via local storage redundancy and optional network backup to secure NAS endpoints. Software installation packages include IQ/OQ documentation templates aligned with GMP Annex 11 and ISO 13485 quality system requirements.

Applications

This system supports controlled reaction kinetics studies in synthetic chemistry, enzymatic activity assays requiring strict thermal uniformity, dissolution testing per USP , calibration of temperature-sensitive sensors (e.g., RTDs, thermistors), and thermal preconditioning of materials prior to mechanical or rheological characterization. It is routinely deployed in QC laboratories performing ASTM D524, ISO 3104, and DIN 51562 viscosity measurements where bath temperature deviation directly impacts kinematic viscosity accuracy. The integrated stirring function eliminates manual agitation during long-duration stability tests, reducing operator variability and improving inter-laboratory reproducibility.

FAQ

What types of heat transfer fluids are compatible with the CD-201FS?
Water, 50/50 ethylene glycol–water mixtures, and silicone oils with flash points above 150 °C are approved. Avoid chlorinated solvents or low-flash-point hydrocarbons.
Does the unit support external temperature feedback control?
Yes — optional PT100 probe input enables external sensor-based control mode, allowing regulation at the sample location rather than bath setpoint.
Is LabWorldSoft™ validation documentation available?
Yes — IQ/OQ protocols, risk assessments, and traceability matrices are supplied with enterprise licensing and meet ALCOA+ data integrity principles.
Can the stirrer operate independently of temperature control?
Yes — stirring speed and activation can be decoupled from thermal program execution via software or front-panel interface.
What maintenance intervals are recommended for the refrigeration system?
Condenser grille cleaning every 3 months; annual inspection of refrigerant charge and compressor oil level by Julabo-certified service personnel.