LAUDA Proline PB Bridge Circulator for Bath Temperature Control

Overview

The LAUDA Proline PB Bridge Circulator is a high-precision, German-engineered temperature control system designed for demanding laboratory applications requiring stable, uniform thermal management of external baths. Operating on the principle of forced-circulation liquid thermostating, the PB model employs a closed-loop bridge configuration—where the circulator is mounted directly onto the bath via an adjustable telescopic support rod—enabling efficient heat transfer without requiring internal immersion or permanent plumbing. Its core architecture integrates a dual-mode Varioflex pump capable of both pressure and suction operation, allowing compatibility with baths up to 320 mm in depth and 550 mm in width. With a standard operating range of 30–300 °C and optional extension down to −30 °C when paired with external refrigeration, the PB delivers exceptional thermal stability (±0.01 K) across its full span—critical for applications involving polymer processing, reaction calorimetry, material testing, and high-temperature rheology.

Key Features

• Bridge-mount design with fully retractable, height-adjustable telescopic support rod (310–550 mm bath width compatible)
• Varioflex dual-function pump offering 8-step adjustable pressure and suction modes—optimized for viscous media and variable head resistance
• Microprocessor-based PID controller with adaptive PowerAdapt technology, dynamically allocating heating power within electrical supply limits (max. 3.6 kW heating, 3.7 kW total consumption)
• Integrated overtemperature protection with user-defined lower-limit threshold, audible alarm, and fail-safe shutdown—certified for use with flammable and non-flammable heat transfer fluids
• Intuitive 3-button interface with high-contrast LED display for real-time monitoring of setpoint, actual temperature, pump speed, and system status
• Built-in self-diagnostic assistant for rapid fault identification and maintenance logging
• Dual-position pump ports (rear and side) with integrated bypass valve—ensuring flexible hose routing and minimal flow disruption during installation or service
• Expandable communication architecture supporting optional RS232/485, Profibus DP, analog/digital I/O, and Ethernet/USB interface modules for integration into automated lab networks

Sample Compatibility & Compliance

The Proline PB is engineered for compatibility with a broad spectrum of external bath configurations—including stainless steel, glass-jacketed, and open-top vessels—without modification to the bath itself. Its pressure/suction capability supports circulation through auxiliary equipment such as jacketed reactors, inline viscometers, or UV-Vis cuvette holders. The unit complies with IEC 61010-1 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use) and carries CE marking under the EU Machinery Directive. When operated with certified heat transfer fluids (e.g., silicone oils, glycol/water mixtures), it meets ASTM D2570 (Standard Test Method for Thermal Stability of Heat Transfer Fluids) requirements for long-term operational integrity. Optional interface modules support audit-trail generation compliant with FDA 21 CFR Part 11 and GLP/GMP documentation standards.

Software & Data Management

While the PB operates autonomously via its front-panel interface, optional digital modules enable seamless integration with laboratory information management systems (LIMS) and supervisory control platforms. The RS485 or Ethernet module permits remote parameter setting, real-time data streaming (temperature, pump speed, power draw), and event logging—including overtemperature alarms, pump faults, or power interruptions. All logged data retain time stamps and user IDs where authentication is enabled. Firmware updates are performed via USB or network connection, ensuring traceability and version control in regulated environments. No proprietary software installation is required for basic operation; ASCII-based command protocols simplify custom scripting in Python, LabVIEW, or MATLAB environments.

Applications

• Polymer melt processing and extrusion simulation requiring precise thermal ramping between 150–300 °C
• Accelerated aging studies of elastomers and composites per ISO 188 and ASTM D573
• Calibration of high-temperature RTDs, thermocouples, and infrared sensors
• Thermal conditioning of optical components and laser cavities where sub-0.02 K drift is unacceptable
• Supporting high-temperature GC oven preheating and column temperature programming
• Material testing per ASTM D648 (Heat Deflection Temperature) and ISO 75 (Vicat Softening Temperature)

FAQ

Can the Proline PB operate below ambient temperature?
Yes—when connected to an external chiller or cryogenic heat exchanger, the PB achieves a full operational range of −30 °C to 300 °C.
Is the Varioflex pump suitable for use with silicone oil at 300 °C?
Yes—the pump housing and seals are rated for continuous operation with standard high-temperature silicone oils (e.g., DC200 series) up to 300 °C.
Does the PB support 21 CFR Part 11 compliance out of the box?
The base unit does not include electronic signatures or audit trails; however, optional Ethernet/USB modules with firmware v3.2+ provide configurable user access levels, electronic logbooks, and exportable CSV/CSVX reports meeting Part 11 requirements.
What is the maximum recommended bath volume for stable control at 300 °C?
For optimal thermal homogeneity and response time, LAUDA recommends bath volumes ≤ 40 L when operating above 250 °C; larger volumes require extended equilibration and may reduce stability to ±0.02 K.
Can the telescopic rod be retrofitted to older Proline models?
No—the PB-specific rod assembly includes reinforced mounting brackets and load-balanced pivot joints; it is mechanically and electrically incompatible with prior Proline generations.