LAUDA Alpha A Immersion Circulator (Bath-Not-Included), 25–100 °C

Overview

The LAUDA Alpha A Immersion Circulator is a compact, high-precision temperature control unit engineered for external bath applications in analytical, quality control, and research laboratories. Unlike integrated bath circulators, the Alpha A is designed as a standalone immersion heater and pump module—intended for mounting directly onto user-supplied baths with wall thicknesses up to 30 mm. It operates on the principle of forced convection: an internal centrifugal pump circulates thermal fluid (water or silicone oil) through the external bath vessel, while a PID-controlled heating element maintains setpoint accuracy within ±0.05 K across its full operating range of 25–100 °C. Its robust aluminum housing, sealed electronics, and low-noise pump architecture ensure long-term reliability under continuous operation. The device complies with IEC 61010-1 safety standards for laboratory electrical equipment and meets electromagnetic compatibility requirements per EN 61326-1.

Key Features

• High-stability temperature control with ±0.05 K stability at setpoint—validated per ISO/IEC 17025 traceable calibration protocols
• Modular immersion design: mounts externally to user-provided baths (e.g., glass, stainless steel, or polypropylene vessels) without requiring proprietary tank integration
• Adjustable flow rate (0–15 L/min) and pressure-limited delivery (max. 0.2 bar) to prevent overflow or splashing in open-bath configurations
• Dual-voltage compatibility (220 V/60 Hz or 230 V/50 Hz) with CEE7/7 Schuko plug—suitable for global lab infrastructure without adapter dependency
• Thermally insulated heater core and low-thermal-mass sensor placement minimize overshoot and improve response time during ramping cycles
• Compact footprint (W × D × H ≈ 145 × 180 × 290 mm) and lightweight construction (3.6 kg) facilitate benchtop repositioning and shared-instrument workflows

Sample Compatibility & Compliance

The Alpha A supports a wide range of bath media—including deionized water, glycol-water mixtures, and silicone oils—enabling compatibility with diverse sample types such as enzymatic reaction cuvettes, viscometry spindles, calorimetric cells, and dissolution apparatus vessels. Its external-mount configuration eliminates direct contact between the circulator’s electronics and bath fluids, enhancing chemical resistance and simplifying cleaning protocols. From a regulatory standpoint, the unit supports GLP-compliant temperature validation when paired with external PT100 probes and third-party data loggers. While the Alpha A itself does not include built-in audit trail or electronic signature functionality, its analog output (0–10 V) allows integration into LIMS or SCADA systems meeting FDA 21 CFR Part 11 requirements via validated interface hardware.

Software & Data Management

The LAUDA Alpha A operates via an intuitive front-panel interface with rotary encoder and dual-line LCD display—showing real-time temperature, setpoint, and pump status. It features no embedded software stack or network connectivity; instead, it prioritizes deterministic, firmware-level control for maximum operational uptime and minimal failure modes. Analog voltage output (0–10 V proportional to measured temperature) enables connection to programmable logic controllers (PLCs), chart recorders, or PC-based DAQ systems running LabVIEW, MATLAB, or Python (via USB-to-analog converters). For laboratories requiring digital traceability, optional LAUDA RCxx-series controllers can be deployed upstream to provide RS485 Modbus RTU communication, event logging, and password-protected parameter locking—aligning with ISO 17025 clause 6.4.8 on equipment management.

Applications

• Temperature stabilization of UV-Vis spectrophotometer sample compartments and flow cells
• Controlled heating of jacketed reactors and glassware during synthetic chemistry procedures
• Calibration support for thermometers, RTDs, and thermocouples per ASTM E74 and ISO 17025
• Steady-state thermal conditioning of polymer melt rheometers and differential scanning calorimeters (DSC)
• Supporting USP and compounding environments where precise ambient-equilibration baths are required
• Integration into automated dissolution testing systems (e.g., USP Apparatus II) for sink condition maintenance

FAQ

Does the Alpha A include a bath vessel?
No—the Alpha A is a bath-not-included immersion circulator. Users must supply their own compatible bath (wall thickness ≤30 mm) and fill it with appropriate heat-transfer fluid.
Can it cool below ambient temperature?
No—it is a heating-only circulator. For sub-ambient control, consider LAUDA’s Alpha K or Proline series with integrated refrigeration.
Is it suitable for use with flammable solvents?
Only with non-flammable heat-transfer media. Do not operate with ethanol, acetone, or other Class I liquids unless housed in an explosion-proof enclosure meeting ATEX/IECEx directives.
What maintenance is required?
Annual inspection of pump impeller clearance and O-ring integrity is recommended. Filter cleaning every 6 months prevents particulate-induced flow restriction.
How is temperature uniformity verified in the external bath?
Uniformity must be assessed separately using multiple calibrated PT100 probes placed at defined positions (e.g., center, corners, top/bottom)—per ISO 17025 Annex A.3.2 guidelines for auxiliary equipment validation.