Julabo FP40-HL General-Purpose Heating and Cooling Circulating Bath

Overview

The Julabo FP40-HL is a high-precision, general-purpose heating and cooling circulating bath engineered for demanding laboratory temperature control applications requiring both wide thermal range and exceptional stability. Operating on a closed-loop refrigeration cycle with a single-stage air-cooled compressor and R134a refrigerant, the FP40-HL delivers accurate, reproducible thermal management across a broad spectrum—from cryogenic operation at −40 °C to high-temperature performance up to +200 °C. Its design integrates advanced thermal control architecture—including Intelligent Cascade Control (ICC), Temperature Compensation Function (TCF), and three-point ATC3 calibration—to ensure minimal overshoot, rapid equilibration, and long-term drift resistance. Unlike basic immersion baths, the FP40-HL is explicitly optimized for external temperature regulation of analytical instruments (e.g., viscometers, refractometers, UV-Vis spectrophotometers) and process equipment (e.g., jacketed reactors, calorimeters), supporting both internal bath use and precise remote system control via integrated Pt100 sensor input.

Key Features

• VFD white-backlit LCD display showing real-time bath temperature, setpoint, external sensor reading, pump status, and alarm conditions simultaneously
• Waterproof membrane keyboard with tactile feedback for reliable parameter entry under humid or solvent-exposed lab conditions
• SmartPump technology: dynamically adjusts motor power output based on fluid viscosity and system backpressure—ensuring consistent flow (22–26 L/min) and pressure (0.4–0.7 bar) across temperature transitions
• Integrated low-level detection with visual/audible alert and automatic heater/compressor shutdown to prevent dry-run damage
• Programmable 6×60-step temperature ramping profile for unattended thermal cycling experiments
• RS232 serial interface standard; optional RS485 and Profibus modules support integration into centralized lab automation systems compliant with IEEE 11073 or LabVantage frameworks
• Front-mounted drain valve and removable air-intake grille enable routine maintenance without disassembly or tooling
• DIN 12876-1 Class III (FL) certification confirms suitability for flammable liquid environments—critical for organic solvent-based applications

Sample Compatibility & Compliance

The FP40-HL accommodates aqueous, silicone oil, and synthetic heat-transfer fluids compatible with its stainless-steel reservoir and wetted components (including EPDM seals rated to +200 °C). Its open-bath geometry (23 × 14 × 20 cm W×L×D) supports immersion of large-volume vessels and custom fixtures. All models meet IEC 61010-1 safety requirements for laboratory electrical equipment and comply with EMC Directive 2014/30/EU. The integrated external Pt100 interface enables direct feedback control of external systems per ASTM E2877-22 (Standard Guide for Temperature Uniformity Assessment of Liquid Baths), supporting GLP/GMP audit readiness. Firmware supports configurable alarm thresholds, event logging with timestamps, and password-protected parameter access—facilitating alignment with FDA 21 CFR Part 11 requirements when paired with validated data acquisition software.

Software & Data Management

While standalone operation requires no PC, the FP40-HL’s RS232 port enables bidirectional communication with third-party SCADA platforms or custom Python/LabVIEW applications using ASCII protocol commands (e.g., “OUT_SP_01=85.2” to set point). Optional analog I/O modules provide 0–10 V or 4–20 mA outputs for PLC interfacing. Internal non-volatile memory retains all user-defined programs and calibration offsets across power cycles. Event logs—including temperature excursions, pump faults, and low-fluid alerts—are timestamped and exportable via terminal emulation. No proprietary cloud service or subscription is required; all configuration and diagnostics remain fully local and deterministic—essential for regulated QC/QA laboratories maintaining full data sovereignty.

Applications

• Precision thermal conditioning of rheometers, rotational viscometers, and capillary viscometers per ISO 2555 and ASTM D445
• Temperature stabilization of optical cells in refractometers (ASTM D1218) and spectrophotometers (USP )
• Jacketed reactor temperature control in synthetic chemistry workflows, including exothermic reaction quenching and cryogenic Grignard protocols
• Calibration of thermocouples, RTDs, and infrared sensors against NIST-traceable references
• Accelerated aging studies per ICH Q1A(R2) guidelines using programmable thermal profiles
• Material testing per ISO 6722 (automotive wiring) and ASTM D3418 (DSC sample prep)

FAQ

What is the minimum recommended fluid volume for stable operation at −40 °C?
For optimal low-temperature stability and compressor protection, maintain ≥12 L of certified low-temperature bath fluid (e.g., Julabo F12 or equivalent silicone oil).
Can the FP40-HL control an external reactor without additional hardware?
Yes—the integrated Pt100 input allows direct connection of an external probe; the unit then regulates bath output to maintain the external sensor’s setpoint, eliminating need for separate controllers.
Is firmware update capability available via USB or network?
Firmware updates require RS232 connection and Julabo-certified utility software; no network or USB interface is provided to preserve electromagnetic isolation and regulatory compliance.
How does SmartPump respond to increased system backpressure during high-viscosity oil circulation?
SmartPump continuously monitors current draw and rotational speed, increasing torque output within rated limits to sustain target flow—verified per DIN EN ISO 5171 test methodology.
Does the unit support dual-sensor differential control (e.g., bath + external)?
No—the FP40-HL implements single-loop control; however, the external Pt100 mode prioritizes external sensor feedback, effectively decoupling bath temperature from control objective.