LAUDA Alpha RA 8/12/24 Refrigerated Circulating Bath

Overview

The LAUDA Alpha RA 8/12/24 Refrigerated Circulating Bath is an engineered solution for precise, stable temperature control across a broad operational range of −25 °C to +100 °C. Based on closed-loop thermoregulation using a dual-mode (refrigeration + electric heating) system, it employs a hermetically sealed scroll compressor and PID-controlled resistive heating elements to maintain thermal equilibrium with high reproducibility. Designed for laboratory environments where reliability, energy efficiency, and long-term operational integrity are critical, the Alpha series implements a demand-driven compressor activation strategy—engaging cooling power only when required—to minimize mechanical wear and reduce electricity consumption. Its stainless steel bath vessel ensures chemical resistance and structural rigidity, while the integrated external circulation port enables seamless integration with external reactors, viscometers, spectrophotometer jackets, or other temperature-sensitive instrumentation.

Key Features

• Stainless steel bath vessel with rear-mounted drain valve for safe, residue-free fluid exchange
• Intelligent compressor management system that dynamically adjusts refrigeration output based on real-time thermal load, extending compressor service life and lowering total cost of ownership
• Front-access condenser grille designed for tool-free removal—enabling rapid maintenance and routine dust removal without disassembly
• Factory-calibrated temperature stability of ±0.05 °C at setpoint (measured in water at mid-bath depth, under static conditions)
• Standard inclusion of bath cover, external circulation pump assembly, and chemically resistant silicone tubing (ISO 3309 compliant)
• Three volume configurations (RA 8: 7.5 L; RA 12: 14.5 L; RA 24: 22.0 L) to match varying experimental scale and heat capacity requirements
• Compliant with IEC 61010-1:2010 safety standards for laboratory electrical equipment and CE-marked for use within the European Economic Area

Sample Compatibility & Compliance

The LAUDA Alpha series is validated exclusively for use with non-flammable heat transfer fluids—including deionized water and aqueous ethylene glycol mixtures (up to 50% v/v). It is not rated for organic solvents, hydrocarbons, or any flammable media. All models comply with ISO/IEC 17025:2017 general requirements for the competence of testing and calibration laboratories, supporting traceable temperature verification protocols. The bath’s thermal performance data is generated and documented per ASTM E74–22 (Standard Practice for Calibration of Laboratory Thermometers) and supports GLP-compliant workflows through configurable logging intervals and user-accessible calibration offset adjustment.

Software & Data Management

While the Alpha RA series operates via an intuitive front-panel interface with LED display and rotary encoder navigation, optional RS232 or USB connectivity (via LAUDA’s optional COM module) enables remote monitoring and parameter setting via LAUDA’s proprietary LabSoft software. This software supports time-stamped temperature logging, alarm event export (e.g., overtemperature, low-level detection), and export of CSV-formatted datasets compatible with LIMS integration. Audit trail functionality—including operator ID tagging and change history—is available when used in conjunction with LabSoft Enterprise Edition, satisfying FDA 21 CFR Part 11 requirements for electronic records and signatures in regulated QC/QA environments.

Applications

• Calibration of reference thermometers, RTDs, and thermocouples across extended temperature ranges
• Temperature stabilization of analytical instruments including HPLC column ovens, UV-Vis cuvette holders, and FTIR sample compartments
• Controlled-rate cooling/heating of reaction mixtures in jacketed glass reactors (when paired with external circulation)
• Material testing under defined thermal conditions—e.g., polymer viscosity profiling, phase transition analysis, and thermal expansion coefficient determination
• Cell culture incubator pre-conditioning and environmental chamber validation
• Supporting ASTM D2857 (FTIR spectroscopy), ISO 11357 (DSC calibration), and USP (thermometer calibration) procedures

FAQ

What fluids are approved for use in the LAUDA Alpha bath?
Only non-flammable liquids such as deionized water and aqueous ethylene glycol solutions (≤50% concentration) are permitted. Flammable, corrosive, or highly viscous fluids will void warranty and compromise safety compliance.
Can the Alpha RA bath be used for external circulation with pressurized systems?
Yes—the external circulation pump delivers up to 12 L/min at 0.3 bar differential pressure (RA 24 model); however, maximum backpressure tolerance is 0.5 bar. Integration with pressurized reactors requires inline pressure regulation and flow monitoring.
Is NIST-traceable calibration documentation provided with the unit?
A factory-issued calibration certificate (traceable to PTB, Germany) is included. Full NIST-traceable recalibration services are available through LAUDA’s authorized service centers upon request.
How often should the condenser be cleaned?
Under standard laboratory air conditions (ISO 8 cleanroom equivalent), quarterly cleaning is recommended. In high-dust environments, monthly inspection and cleaning are advised to sustain optimal heat exchange efficiency.
Does the Alpha series support programming ramps and holds?
No—the Alpha RA models feature fixed-point temperature control only. For programmable ramp/soak profiles, consider the LAUDA Proline or Chiller series with integrated controller logic.