Julabo CORIO CD Heating Circulator

Overview

The Julabo CORIO CD Heating Circulator is a precision-engineered laboratory circulator designed for stable, controllable heating of external baths and internal process loops. Operating on the principle of forced convection via a high-efficiency centrifugal pump, it delivers consistent thermal energy transfer across a wide operational range from +20 °C to +150 °C. Unlike immersion heaters or static baths, the CORIO CD integrates closed-loop temperature regulation with real-time feedback control—enabling repeatable thermal conditioning for applications requiring long-duration stability and minimal drift. Its compact footprint and modular immersion design make it suitable for integration into jacketed reactors, viscometers, spectrophotometer cells, and other externally temperature-controlled instrumentation where space, safety, and regulatory compliance are critical.

Key Features

• Intelligent cascade control architecture combining PID1 algorithm with ACC (Adaptive Cascade Control) for rapid response and minimized overshoot during setpoint transitions
• ATC1 (Absolute Temperature Calibration) functionality enabling user-performed single-point calibration at any temperature within the operating range—ensuring traceable accuracy without external reference equipment
• High-brightness white LED display with adjustable contrast, visible from ≥3 meters under standard lab lighting conditions
• Corrosion-resistant stainless steel heating coil with smooth internal surface finish—resistant to scaling in water- and oil-based media; compatible with common organic solvents when used with appropriate bath fluids
• Adjustable immersion depth (7.5–16.5 cm) accommodates varying bath geometries and fluid levels; optional extended cooling coil available for hybrid heating/cooling configurations
• 360° rotatable internal circulation outlet for optimal flow alignment with bath inlet ports or reactor jackets
• Acoustically optimized pump housing and motor isolation—operating noise level ≤42 dB(A) at 1 m distance
• Dual power mode selection: standby (low-power monitoring state) or auto-start (resumes last active setpoint upon power restoration)
• Lockable IEC 60320 C14 power inlet with integrated overtemperature cutoff and redundant thermal fusing
• Integrated float-level sensor triggering audible/visual alarm and automatic heater shutdown below minimum fill level—preventing dry-run damage and fire hazard
• Thermally balanced internal layout with enlarged ventilation channels and aluminum heat-spreading chassis—designed for continuous operation at maximum load in ambient temperatures up to 40 °C

Sample Compatibility & Compliance

The CORIO CD is engineered for compatibility with aqueous, silicone oil, glycol-water, and mineral oil-based heat transfer fluids. It meets DIN 12876-1 Class III (FL) requirements for flammable liquid handling—certifying safe operation with fluids having flash points as low as 60 °C. Electrical safety conforms to EN 61010-1 (Laboratory Equipment) and electromagnetic compatibility to EN 61326-1. The unit is RoHS-compliant and registered under WEEE directive. While not intrinsically rated for hazardous area use, its FL certification permits deployment in general-purpose chemical laboratories where volatile solvents are handled under controlled ventilation. No modifications are required to satisfy GLP documentation requirements; all safety interlocks and calibration events are logged internally and exportable via optional RS232 interface.

Software & Data Management

The CORIO CD operates autonomously without PC dependency, but supports optional serial communication (RS232) for remote parameter setting, real-time temperature logging, and event-triggered data capture (e.g., alarm activation, calibration execution). When integrated into validated environments, its ATC1 calibration records—including date, operator ID, reference temperature, and deviation value—can be archived as part of instrument qualification packages. The device complies with FDA 21 CFR Part 11 principles when paired with compliant third-party LIMS or ELN systems: audit trails are time-stamped, non-erasable, and include operator identification for all configuration changes. Firmware updates are performed via secure USB interface with cryptographic signature verification.

Applications

• Temperature control of 50 L external baths for dissolution testing (USP ) and stability chambers
• Heating jacket support for rotational rheometers, differential scanning calorimeters (DSC), and dynamic mechanical analyzers (DMA)
• Pre-conditioning of samples prior to FTIR, UV-Vis, or HPLC analysis where thermal history affects spectral baseline or retention time
• Process validation studies requiring ISO/IEC 17025-compliant thermal uniformity mapping (per ISO 17025:2017 clause 7.8.2)
• QC/QA workflows in pharmaceutical manufacturing adhering to ICH Q5C and Q5D guidelines for protein thermostability assessment
• Material science labs performing thermal aging of polymers per ASTM D3045 or ISO 2578

FAQ

What is the maximum recommended bath volume for the CORIO CD?
The unit is validated for stable operation with external baths up to 50 L. Larger volumes may result in prolonged equilibration times and reduced temperature uniformity unless auxiliary mixing is employed.
Can the CORIO CD be used with silicone oil at 150 °C continuously?
Yes—provided the selected oil grade has a flash point ≥200 °C and thermal oxidative stability rating meeting ASTM D92 and D2879 specifications. Julabo recommends regular fluid analysis every 6 months under continuous 150 °C operation.
Does the ATC1 calibration require external reference equipment?
No. ATC1 uses the unit’s factory-traceable Pt100 sensor array and internal reference junctions to perform a single-point offset correction. A certified NIST-traceable thermometer is only required for initial metrological verification—not routine recalibration.
Is the pump flow rate adjustable?
No—the pump operates at fixed speed (15 L/min nominal at 0.35 bar pressure). Flow modulation is achieved externally via needle valves or bypass manifolds installed in the circulation loop.
How does the low-level protection respond during partial bath filling?
The float sensor activates at ≤1.5 cm fluid height above the heater coil base. Upon detection, the system halts heating immediately, triggers dual-tone audible alert, and illuminates red LED—power remains available for diagnostics but cannot be re-enabled until fluid level is restored and reset manually.