LAUDA ECO RE 1225 S Refrigerated Circulating Bath with External Loop

Overview

The LAUDA ECO RE 1225 S is a high-precision, refrigerated circulating bath engineered for demanding laboratory applications requiring stable thermal control across an exceptionally wide temperature range—from −25 °C to +200 °C. Designed and manufactured in Germany, this unit integrates a compact yet robust chiller-heater architecture with a stainless-steel bath reservoir and an intelligent SmartCool collaborative cooling system. Its operational principle relies on closed-loop liquid circulation—using either water, water-glycol mixtures, or silicone oils—wherein a variable-speed pump delivers conditioned fluid to external equipment (e.g., reactors, viscometers, spectrophotometer jackets) while maintaining tight setpoint adherence via a full electronic PID controller. The device operates as both a bath and an external circulator, supporting dual-mode operation without hardware modification. Its Class III safety rating ensures compatibility with flammable heat-transfer media under IEC 61010-1, making it suitable for use in chemical synthesis, polymer characterization, and pharmaceutical stability testing environments where regulatory compliance and process reproducibility are critical.

Key Features

• LAUDA Silver immersion thermostat with monochrome graphical LCD display—simultaneously shows setpoint and actual bath temperature with intuitive soft-key navigation
• Vario pump with six adjustable flow stages (0–100%), enabling precise optimization of pressure and flow for diverse external load configurations
• SmartCool adaptive cooling system dynamically modulates compressor output based on real-time thermal demand, minimizing energy consumption and condensation risk
• Integrated 20-segment programmable timer (1 program, up to 20 steps) for unattended ramp-soak sequences, including rate-limited transitions and hold functions
• USB interface standard; optional modular expansion for RS-232/485, Profibus DP, Ethernet/IP, analog I/O (0–10 V / 4–20 mA), digital contact I/O, or Pt100/LiBus remote control
• Stainless-steel bath (200 × 200 × 200 mm) with drain valve, 13 mm quick-connect pump fittings, and insulated lid included
• Overtemperature protection (Tmax) configurable via menu; electronic safety cutoff independent of main controller
• Compliant with EU F-Gas Regulation (EU) No 517/2014; uses R-134a refrigerant (GWP 1430) with certified charge (0.075 kg)
• Thermal stability of ±0.02 K at setpoint, verified per ISO 17025-accredited calibration protocols
• Designed for GLP/GMP-aligned workflows: audit-trail-ready firmware (with optional logging modules), traceable calibration certificates available

Sample Compatibility & Compliance

The RE 1225 S accommodates a broad spectrum of heat-transfer fluids—including deionized water, ethylene glycol/water blends (up to 60 % v/v), and silicone oils (e.g., DC200 series)—enabling safe operation from sub-zero cryogenic conditions to high-temperature oil baths. Its stainless-steel bath and wetted components resist corrosion from mildly aggressive solvents, though compatibility with halogenated or strongly acidic media requires prior verification. The unit meets IEC 61010-1 Edition 3 for laboratory electrical safety and carries CE marking under the EU Machinery Directive 2006/42/EC and EMC Directive 2014/30/EU. It supports compliance with USP (Temperature Control of Laboratory Equipment), ASTM E2927-21 (Performance Verification of Liquid Baths), and FDA 21 CFR Part 11 when paired with LAUDA’s optional data logging software and electronic signature modules.

Software & Data Management

While the RE 1225 S operates autonomously via its embedded controller, connectivity options allow integration into centralized lab infrastructure. The standard USB port enables direct connection to Windows-based PCs for firmware updates and basic parameter export. Optional communication modules support bidirectional command-and-control via ASCII protocol over RS-485 or TCP/IP, permitting integration with SCADA systems, LIMS, or custom Python/Matlab scripts. When equipped with the LAUDA LabSoft Pro software suite (sold separately), users gain access to real-time graphing, automated report generation (PDF/CSV), event-triggered data capture, and electronic audit trails—including user login tracking, parameter change logs, and alarm history—with time-stamped entries compliant with ALCOA+ principles.

Applications

• Calibration of thermometers, RTDs, and thermocouples per ISO/IEC 17025 requirements
• Temperature conditioning of rheometers, DSC, TGA, and viscometers requiring external fluid loops
• Controlled-rate heating/cooling of jacketed glass reactors in synthetic organic chemistry
• Stability testing of pharmaceutical formulations under ICH Q1A(R3) guidelines
• Material testing per ASTM D341 (viscosity–temperature charts) and ASTM D92 (flash point determination)
• Environmental simulation for electronics reliability testing (e.g., thermal cycling per JEDEC JESD22-A104)
• Bioreactor jacket temperature control in upstream bioprocessing development

FAQ

What is the minimum and maximum recommended fill volume for the bath?
The stainless-steel bath has a nominal capacity of 12.0 L, with a minimum functional fill volume of 9.3 L to ensure proper sensor immersion and pump priming.
Can the RE 1225 S operate continuously at 200 °C using silicone oil?
Yes—provided the selected oil meets flash point and thermal stability specifications (e.g., Dow Corning DC200 Fluid 50 cSt), and ambient conditions remain within 5–40 °C per specification.
Is the unit compatible with 110 V / 60 Hz power supplies?
No—the RE 1225 S is configured for 230 V / 50 Hz operation only; voltage conversion requires an externally rated isolation transformer meeting IEC 61558 standards.
Does the SmartCool system reduce refrigerant emissions?
While SmartCool does not eliminate refrigerant use, its demand-responsive compressor modulation lowers on/off cycling, extending service intervals and reducing long-term leakage probability—supporting compliance with EU F-Gas leak-check frequency mandates.
How is temperature uniformity validated across the bath volume?
LAUDA specifies axial and radial uniformity of ≤ ±0.05 K at 25 °C (measured at 5 defined points per DIN 12876-1); full validation reports are available upon request with NIST-traceable probe calibration.