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

Overview

The Julabo FP40-HE is a high-precision, general-purpose heating and cooling circulating bath engineered for demanding laboratory applications requiring stable thermal control across an exceptionally wide temperature range (−40 °C to +200 °C). Based on Julabo’s proven single-compressor refrigeration architecture with R404A refrigerant and integrated electric heating elements, the FP40-HE employs Couette-flow circulation dynamics and PID-based Intelligent Control Circuitry (ICC) to achieve ±0.01 °C temperature stability under dynamic load conditions. Its design targets two primary operational modes: (1) internal bath temperature maintenance for sample immersion or calibration baths, and (2) external temperature regulation via closed-loop circulation through auxiliary equipment—such as jacketed reactors, rotational viscometers, refractometers, UV-Vis spectrophotometers, and calorimeters. The unit complies with IEC 61010-1 for laboratory electrical safety and meets CE and RoHS directives, ensuring suitability for ISO/IEC 17025-accredited laboratories and GLP-regulated environments where traceable thermal performance is mandatory.

Key Features

• VFD white-backlit display showing real-time bath temperature, setpoint, external sensor reading (if connected), pump status, and alarm codes
• Waterproof membrane keyboard with tactile feedback for parameter entry under wet lab conditions
• ATC3 three-point temperature calibration routine (at 0 °C, 25 °C, and 100 °C) supporting NIST-traceable verification of thermal accuracy
• SmartPump™ technology: automatically adjusts motor torque and flow rate in response to changes in heat transfer fluid viscosity (e.g., silicone oil vs. water-glycol mixtures)
• Integrated external Pt100 sensor port enabling direct measurement and feedback control of process temperature at the point of use—not just at the bath reservoir
• Adjustable overtemperature cutoff with mechanical rotary dial; system halts heating/refrigeration and triggers audible/visual alarm if user-defined limit is exceeded
• Low-level detection circuit with optical sensor and dual-stage alerting (warning → shutdown) to prevent dry-run damage to heater and pump
• RS232 serial interface standard; supports ASCII command protocol for integration into LabVIEW, MATLAB, or custom SCADA systems
• Removable front air-intake grille facilitating routine cleaning of condenser coils without tools or disassembly
• Front-mounted drain valve and recessed casters with locking brakes for ergonomic repositioning within constrained benchtop layouts

Sample Compatibility & Compliance

The FP40-HE accommodates a broad spectrum of heat transfer media—including deionized water, 50/50 ethylene glycol/water solutions, and high-temperature silicone oils (up to 200 °C)—via its chemically resistant stainless-steel bath chamber and fluoropolymer-sealed pump head. Its 16 L working volume supports immersion of large-volume samples or multi-port external loops. All models conform to ASTM E2877-22 (Standard Guide for Thermal Calibration of Liquid Baths) and support IQ/OQ documentation packages required for FDA 21 CFR Part 11-compliant validation. The built-in ATC3 calibration function enables in-house verification against reference standards traceable to national metrology institutes. For regulated QC labs, optional Profibus-DP or analog I/O modules (0–10 V / 4–20 mA) permit integration into distributed control systems compliant with ISA-88 and ISA-95 frameworks.

Software & Data Management

While the FP40-HE operates autonomously via its embedded controller, its RS232 interface enables bidirectional communication for remote monitoring and scripting. Julabo’s optional WinTherm software (Windows-compatible) provides time-stamped logging of temperature, pump speed, compressor duty cycle, and alarm events at user-selectable intervals (1 s to 60 min). Data exports to CSV format are compatible with LIMS platforms and statistical process control (SPC) tools such as Minitab or JMP. Audit trail functionality records all parameter changes—including operator ID (via configurable login), timestamp, and pre-/post-value—meeting ALCOA+ principles for data integrity in GxP environments. No cloud connectivity or proprietary firmware updates are required; all configuration remains local and deterministic.

Applications

• Precision temperature control of jacketed glass reactors during exothermic/endothermic synthesis
• Calibration of thermistors, RTDs, and liquid-in-glass thermometers per ISO 17025 clause 6.5.2
• Dynamic viscosity measurements using rotational rheometers requiring ±0.02 °C bath stability
• Refractive index determination with Abbe refractometers under thermostatically stabilized conditions
• Accelerated stability testing of pharmaceutical formulations per ICH Q1A(R2) guidelines
• Material testing of polymers and elastomers in DMA or DSC sample preparation stages
• Environmental simulation for electronics reliability testing (e.g., thermal cycling between −40 °C and +85 °C)

FAQ

What is the minimum recommended heat transfer fluid volume for stable operation?
The bath must be filled to at least 80% of its 16 L capacity (≥12.8 L) to ensure proper submersion of the heater element, temperature sensor, and pump intake—critical for achieving ±0.01 °C stability.
Can the FP40-HE maintain temperature while circulating fluid through a 10-meter external loop with 12-mm tubing?
Yes—its SmartPump™ delivers up to 26 L/min at 0.7 bar pressure, sufficient to overcome typical pressure drops in ≤15 m loops of 12-mm ID tubing when using water-glycol (≤40 cSt viscosity) at ambient lab temperatures.
Is external calibration of the internal Pt100 sensor possible without sending the unit to service?
Yes—the ATC3 function allows users to perform three-point calibration in situ using certified reference probes, generating a correction curve stored in non-volatile memory.
Does the unit comply with energy efficiency regulations such as EU Ecodesign Directive 2019/2023?
Yes—the FP40-HE meets Tier 2 requirements for laboratory cooling equipment, with measured seasonal energy consumption (SEC) of 1,280 kWh/year under standard test conditions (EN 60068-3-5).
What safety interlocks prevent compressor damage during low-temperature operation?
The system implements suction-line pressure monitoring, crankcase heater activation below −20 °C, and minimum run-time delays between compressor restarts to prevent liquid slugging and oil foaming.