LAUDA Proline Th Series Precision Circulating Bath (Germany)

Overview

The LAUDA Proline Th Series is a high-precision, refrigerated/heating circulating bath engineered in Germany for demanding laboratory and industrial applications requiring exceptional thermal stability, wide operational range, and long-term reproducibility. Based on LAUDA’s proprietary SmartCool® digital refrigeration management system, the Proline Th eliminates mechanical throttling and instead modulates compressor fan speed via bus-controlled logic—enabling precise cold output proportional to real-time thermal load. This architecture allows continuous refrigeration across the entire operating range (−90 °C to +200 °C), including at elevated setpoints where conventional systems would disable cooling. The bath employs three independent heating elements and an 8-stage variable-speed circulation pump with dual pressure/suction capability, ensuring uniform heat transfer and stable external loop performance—even under high backpressure or extended tubing configurations. Designed for integration into automated workflows, the Proline Th supports external temperature feedback, remote control via Ethernet/RS232, and full audit-trail data logging compliant with GLP and 21 CFR Part 11 requirements when paired with LAUDA’s Command controller.

Key Features

• SmartCool® digital refrigeration control: Enables dynamic cold output without hardware modification; maintains active cooling at all temperatures up to +200 °C
• Dual-pump architecture: Independent pressure and suction pumps with programmable flow rates (up to 25 L/min pressure / 23 L/min suction) and adjustable head (up to 1.1 bar)
• Triple-zone heating system: Three separately controlled heating elements ensure rapid ramping and minimal thermal gradients
• Dual-level fluid monitoring: Real-time liquid level detection via capacitive sensor + motor current analysis prevents dry-run operation and triggers audible/visual alerts
• Modular expansion support: Pre-wired slots for optional accessories—including automatic refill solenoid valve, anti-siphon check valve, condensation-suppressing heated lid, and external chiller interface
• Intuitive human-machine interface: Three-button navigation with graphical display; supports temperature curve visualization, export to CSV/Excel, and time-stamped event logging
• Robust safety architecture: Overtemperature, overpressure, low-fluid, and pump-failure interlocks with ISO 13850-compliant emergency shutdown and fault-code diagnostics

Sample Compatibility & Compliance

The Proline Th accommodates a broad spectrum of external devices—from rheometers and viscometers to reaction calorimeters, DSC autosamplers, and custom test fixtures—via standardized G1/4″ and G1/2″ external circulation ports located on both rear and side panels. Its stainless-steel bath chamber (electropolished AISI 316L) and PTFE-coated internal components ensure compatibility with water, water-glycol mixtures, silicone oils, and synthetic heat-transfer fluids (e.g., Therminol VP-1, Marlotherm SH). All models comply with IEC 61010-1 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use), CE marking, and RoHS directives. When configured with the Command controller and LAUDA LabSoft software, the system meets data integrity requirements per FDA 21 CFR Part 11 and supports electronic signatures, user access levels, and immutable audit trails suitable for regulated QC/QA environments.

Software & Data Management

The Proline Th integrates seamlessly with LAUDA LabSoft v5.x—a validated Windows-based platform supporting multi-device orchestration, scheduled temperature profiles, and real-time parameter monitoring. LabSoft enables full traceability: every temperature setpoint change, alarm event, pump speed adjustment, or refrigeration activation is timestamped, attributed to a user ID, and stored in encrypted binary logs. Export functions include native .csv for Excel analysis, .png plots of temperature vs. time, and .xml metadata packages compatible with LIMS and ELN systems. Remote access is supported via TCP/IP with TLS 1.2 encryption; API documentation (RESTful JSON interface) is provided for custom SCADA or MES integration. Firmware updates are performed offline via USB stick with SHA-256 checksum verification.

Applications

The Proline Th serves as a critical thermal management platform across R&D, production, and quality control settings. Typical use cases include: precise temperature control of jacketed reactors during exothermic drug synthesis (per ICH Q7 guidelines); thermal conditioning of polymer samples prior to tensile or DMA testing (ASTM D638, ISO 527); calibration of thermocouples and RTDs against NIST-traceable references; stabilization of optical benches and interferometer stages; and maintenance of constant bath temperature for accelerated aging studies (ISO 4892-2). Its extended low-temperature capability (down to −90 °C) supports cryogenic material characterization, while its high-temperature stability makes it suitable for asphalt binder testing (ASTM D7028) and ceramic sintering pre-heating protocols.

FAQ

What is the minimum required fluid volume for safe operation?

Minimum fill level varies by model but is enforced via dual-level detection—typically corresponding to ~60% of nominal bath volume. Operating below this threshold triggers immediate pump shutdown and visual/audible alarm.

Can the Proline Th be used with silicone oil or other non-aqueous media?

Yes—provided the selected model variant is specified for high-viscosity or high-temperature fluids (e.g., RP-series with VFP pump). Consult LAUDA’s fluid compatibility matrix before use.

Is external temperature feedback supported for cascade control?

Yes—via optional Pt100 input port; enables PID control based on sample temperature rather than bath fluid temperature.

How is compliance with 21 CFR Part 11 achieved?

Through LabSoft software with role-based authentication, electronic signatures, audit trail export, and tamper-evident log files—all validated per IQ/OQ protocols available upon request.

What maintenance intervals are recommended?

Compressor oil inspection every 24 months; pump seal replacement every 5 years (or per runtime log); annual calibration verification using accredited reference thermometer.