Julabo Itherm5A Transparent Heating Bath Circulator

Overview

The Julabo Itherm5A Transparent Heating Bath Circulator is a compact, high-precision temperature control system engineered for laboratory applications requiring stable, uniform thermal environments. Designed around a robust Peltier-free resistive heating architecture with integrated circulation, the Itherm5A operates exclusively in heating mode—making it ideal for applications where precise, energy-efficient warming—without refrigeration—is sufficient. Its transparent acrylic bath vessel enables real-time visual monitoring of samples and fluid level, supporting transparency in experimental setup and troubleshooting. The unit employs digital PID temperature control with adaptive tuning algorithms to maintain setpoint accuracy within ±0.05 °C across its full operating range (ambient +5 °C to +60 °C), ensuring high reproducibility in kinetic studies, enzyme assays, material conditioning, and calibration procedures.

Key Features

• Transparent acrylic bath tank (5 L capacity) for unobstructed sample observation and fluid-level verification
• Digital three-button interface for intuitive operation—power, setpoint adjustment, and mode selection—minimizing training overhead
• 1.5 kW high-efficiency stainless-steel heating coil with corrosion-resistant surface treatment and low scaling propensity
• Integrated circulation pump delivering up to 10 L/min flow at 0.23 bar pressure, configurable for internal recirculation or external loop integration
• Intelligent flow ratio control allowing dynamic adjustment between internal and external circuit flow paths
• Comprehensive safety architecture: overtemperature cut-off across the entire working range, float-based low-level detection with audible/visual alarm and automatic power disconnection
• Front-mounted drain valve for rapid, spill-free bath fluid exchange without equipment relocation
• Thermally optimized internal layout with expanded airflow channels and passive heat dissipation zones, enabling continuous-duty operation under ambient lab conditions
• Two operational modes: standby (low-power idle) and auto-start (resumes last-used setpoint and configuration on power-up)

Sample Compatibility & Compliance

The Itherm5A accommodates standard glassware—including beakers, flasks, and reaction vessels—up to 14 cm in width and 15 cm in immersion depth. Its open-bath geometry supports both direct immersion and jacketed vessel configurations. Compatible with water, silicone oils, and low-viscosity glycol–water mixtures (within flash point and chemical compatibility limits). The device conforms to IEC 61010-1:2010 for electrical safety in laboratory equipment and carries CE marking per EU Directive 2014/30/EU (EMC) and 2014/35/EU (LVD). While not intrinsically rated for hazardous locations, its sealed electronics and drip-proof design meet IP20 requirements for indoor laboratory use. All firmware and hardware revisions are traceable for GLP-compliant audit trails; however, the unit does not include FDA 21 CFR Part 11–compliant electronic signature or audit logging functionality natively.

Software & Data Management

The Itherm5A operates as a standalone instrument with no embedded data logging or PC connectivity. Temperature setpoints, current bath temperature, pump status, and alarm states are displayed on a high-contrast LCD screen. For integration into automated workflows, optional analog output (0–10 V or 4–20 mA) is available via accessory module (sold separately), enabling connection to SCADA systems or PLC-based environmental controllers. No proprietary software or drivers are required for basic operation. Users seeking long-term trend analysis or remote monitoring must implement external data acquisition hardware compliant with IEEE 11073 or Modbus RTU protocols.

Applications

• Controlled-temperature incubation of biological reagents and cell culture media prior to assay
• Pre-heating and thermal equilibration of viscometers, densimeters, and refractometers
• Calibration of temperature-sensitive sensors (e.g., Pt100 probes, thermistors) against NIST-traceable references
• Accelerated stability testing of pharmaceutical formulations under ISO 14644–classified cleanroom-adjacent benchtop conditions
• Thermal conditioning of polymer films, adhesives, and elastomers prior to tensile or peel testing (ASTM D882, D903)
• Supporting solvent evaporation steps in sample preparation workflows where gentle, uniform heating is critical
• Acting as a stable thermal source in custom-built optical or electrochemical cells requiring non-vibratory, low-EMI heating

FAQ

Does the Itherm5A support refrigeration or cooling functions?
No—the Itherm5A is a heating-only circulator. Models with active cooling capability (e.g., F25, MF series) are available separately.
Can the Itherm5A be used with silicone oil or other non-aqueous heat transfer fluids?
Yes, provided the fluid’s flash point exceeds 60 °C and it exhibits chemical compatibility with acrylic and stainless steel components. Always consult Julabo’s fluid compatibility guide before substitution.
Is external temperature probe input supported for chamber or sample-point feedback control?
Not by default. The unit regulates based on internal bath sensor readings only. External probe integration requires third-party PID controllers with analog input capability.
What maintenance intervals are recommended for long-term reliability?
Julabo recommends quarterly visual inspection of the bath tank, pump intake screen, and drain valve; annual cleaning of the heating coil with citric acid solution (10% w/v); and biannual verification of temperature stability using a calibrated reference thermometer per ISO/IEC 17025 guidelines.
Is the Itherm5A suitable for GMP-regulated environments?
It may be deployed in GMP settings as a Class III auxiliary equipment item, but users must establish and document their own qualification protocol (IQ/OQ/PQ), including calibration frequency, alarm response validation, and preventive maintenance records.