Julabo HT60-M2-CU Closed-Loop High-Temperature Dynamic Temperature Control System

Overview

The Julabo HT60-M2-CU is a closed-loop, high-temperature dynamic temperature control system engineered for precise, stable, and reproducible thermal management in demanding laboratory and pilot-scale applications. Unlike conventional open-bath circulators, the HT60-M2-CU employs a hermetically sealed circulation loop—eliminating evaporation, oxidation, and volatile organic emissions even at sustained temperatures up to +400 °C. Its operational principle relies on forced convection of thermally stable synthetic heat transfer fluids (e.g., silicone oils or aromatic hydrocarbons) through a dual-path architecture: one path supplies heated fluid to the external process (e.g., reactor jacket, calorimeter cell), while the integrated cooling unit (C.U.) enables active heat extraction during exothermic events. This dynamic balance—enabled by Julabo’s ICC (Intelligent Cascade Control) algorithm—ensures rapid thermal response without overshoot, making the system suitable for reaction calorimetry, polymerization kinetics, catalyst testing, and high-temperature material aging studies.

Key Features

• Hermetically sealed circulation loop prevents bath fluid degradation, vapor loss, and odor generation at temperatures up to +400 °C
• Integrated C.U. (Cooling Unit) provides 15 kW of auxiliary refrigeration capacity, enabling true bidirectional temperature control across the full +40 to +400 °C range
• High-power 7.0 kW heating system with optimized heater geometry—designed to eliminate acoustic cracking (“pop” noise) and minimize localized hot spots during ramp-up
• ICC intelligent temperature control technology delivers stability of ±0.01 °C (at setpoints ≤200 °C) to ±0.1 °C (at 400 °C), validated per ISO/IEC 17025 calibration protocols
• Dual-display interface: high-contrast LED for primary setpoint/actual temperature + full-function LCD for real-time monitoring of pump pressure, fluid level, heating power, and cooling status
• Modular design separates circulator and controller units—facilitating installation in confined spaces and simplifying service access
• Robust 2 L reservoir volume optimized for minimal fluid inventory while maintaining sufficient thermal mass for low-drift operation

Sample Compatibility & Compliance

The HT60-M2-CU is compatible with standard laboratory reactors (glass, stainless steel, Hastelloy), jacketed calorimeters (e.g., Mettler Toledo RC1, ChemiSens C80), and high-temperature viscometers or rheometers requiring thermal coupling. It supports process fluids meeting DIN 51524 Part 2 (HLP) or ASTM D3427 specifications. The system complies with IEC 61000-6-3 (EMC), IEC 61000-6-2 (immunity), and EN 61010-1:2019 (safety requirements for electrical equipment). Optional audit-trail-enabled firmware supports GLP/GMP environments and aligns with FDA 21 CFR Part 11 data integrity expectations when paired with Julabo’s LabSoft software.

Software & Data Management

The HT60-M2-CU supports native integration with Julabo LabSoft v5.x—a Windows-based platform enabling multi-device orchestration, SOP-driven temperature profiling, and time-stamped event logging. All analog I/O channels (0–10 V / 4–20 mA) allow external synchronization with PLCs or data acquisition systems. RS232/RS485 interfaces support Modbus RTU protocol for centralized SCADA integration. Critical parameters—including temperature deviation, pump runtime, and cooling duty cycle—are logged at user-defined intervals (1 s to 60 min) and exportable as CSV or PDF reports compliant with internal QA documentation standards.

Applications

• Controlled-temperature synthesis of high-performance polymers (e.g., polyimides, polyetheretherketone)
• Accelerated thermal aging tests per ASTM D3045 and ISO 2578
• Reaction calorimetry of highly exothermic processes (e.g., nitration, hydrogenation) where rapid heat removal is essential
• Thermal validation of autoclaves and sterilization cycles
• Calibration of high-temperature sensors (RTDs, thermocouples) traceable to national metrology institutes
• Material testing under extreme thermal stress (e.g., aerospace composites, battery electrolyte stability)

FAQ

What heat transfer fluids are recommended for continuous operation at 400 °C?
Synthetic aromatic heat transfer fluids (e.g., Dowtherm A, Marlotherm SH) or high-thermal-stability silicone oils (e.g., DC-705) are validated for use. Fluid selection must comply with flash point >450 °C and thermal decomposition onset >420 °C per ASTM D6743.
Can the HT60-M2-CU operate without the C.U. cooling unit?
Yes—but temperature range is limited to +40 to +350 °C, and dynamic cooling capability is disabled. Full +40 to +400 °C performance requires C.U. integration.
Is remote monitoring supported over Ethernet or Wi-Fi?
The base model includes RS232/RS485 only; Ethernet connectivity requires optional Julabo NetLink module (order code: NL-ETH-HT). Wi-Fi is not supported due to EMI constraints in high-power thermal systems.
How often does the system require preventive maintenance?
Julabo recommends annual inspection of pump seals, heater insulation resistance, and fluid degradation analysis (via FTIR or viscosity measurement) after every 2,000 hours of operation at >300 °C.
Does the controller support programmable ramp-soak profiles?
Yes—up to 20 segments per program, with ramp rates adjustable from 0.1 to 50 °C/min and soak dwell times from 1 minute to 999 hours.