JULABO Corio CD-BC4 Stainless Steel Heating Circulating Bath

Overview

The JULABO Corio CD-BC4 is a precision-engineered stainless steel heating circulating bath designed for laboratory-grade temperature control in both internal immersion and external recirculation applications. Operating on the principle of forced convection via an integrated high-efficiency circulation pump, the CD-BC4 delivers exceptional thermal uniformity and dynamic response across its full operating range of +5 °C to +150 °C. Its core architecture integrates PID1 control logic with JULABO’s proprietary ACC (Intelligent Cascade Control) algorithm—enabling rapid stabilization and minimal overshoot during setpoint transitions. The system supports dual-mode operation: direct sample immersion within the bath chamber or closed-loop external temperature regulation of peripheral instruments such as jacketed reactors, viscometers, chromatography columns, polarimeters, electrophoresis units, and spectrophotometers. Constructed entirely from AISI 304 stainless steel—including the heating coil, tank body, and pump housing—the unit ensures long-term corrosion resistance, non-reactivity with common heat transfer fluids (e.g., silicone oil, glycol-water mixtures), and ease of cleaning under GLP-compliant maintenance protocols.

Key Features

• Advanced temperature control combining PID1 and ACC (Intelligent Cascade Control) for ±0.03 °C stability and reproducible ramping profiles
• ATC1 (Absolute Temperature Calibration) function enabling user-performed single-point calibration at any temperature within the operational range
• High-brightness white LED display with adjustable resolution (0.01–0.1 °C), visible from >2 meters under standard lab lighting
• Submersible heating element with optimized immersion depth (7.5–16.5 cm) to accommodate varying fluid levels and thermal mass requirements
• Rotatable internal circulation outlet (M16×1 thread) for flexible hose routing and compatibility with diverse bath geometries
• Low-noise pump design (<52 dB(A) at 1 m) meeting ISO 7779 acoustic emission standards for quiet laboratory environments
• Integrated safety systems: overtemperature cutoff, low-level float switch with audible/visual alarm and automatic power disconnection, lockable IEC 60320 C14 power inlet
• DIN 12876-1 Class III (FL) certification for flammable liquid handling—validated for use with oils and organic heat transfer media up to 150 °C
• Front-access drain valve and ergonomic carrying handles for safe transport and routine maintenance
• Pre-installed cooling coil for optional auxiliary cooling integration (e.g., with chiller units)

Sample Compatibility & Compliance

The CD-BC4 accommodates a broad spectrum of sample formats and external devices via its 3–4.5 L stainless steel bath chamber and 15 L/min recirculation capacity. It is routinely deployed in applications requiring precise thermal conditioning of aqueous buffers, polymer solutions, biological samples, and viscous oils. The unit complies fully with international safety and electromagnetic compatibility directives: EN 61010-1 (electrical safety for lab equipment), EN 61326-1 (EMC for measurement/control equipment), and RoHS/WEEE environmental regulations. Its DIN 12876-1 Class III (FL) rating confirms suitability for continuous operation with flammable heat transfer fluids—critical for high-temperature material testing and reaction calorimetry workflows. All firmware and hardware configurations adhere to traceability requirements for ISO/IEC 17025-accredited laboratories.

Software & Data Management

While the CD-BC4 operates as a standalone instrument with intuitive front-panel controls, it supports optional PC-based monitoring and logging via RS232 or USB interface (cable sold separately). JULABO’s LabSoft software enables real-time temperature graphing, multi-segment program scheduling, and export of timestamped data in CSV format—facilitating audit-ready documentation per FDA 21 CFR Part 11 when used with appropriate user access controls and electronic signature modules. The device maintains internal event logs for critical alarms (e.g., low level, overtemperature), supporting root-cause analysis during quality investigations and regulatory inspections.

Applications

• Thermal equilibration of reference standards and calibration samples prior to analytical measurement
• Temperature stabilization of optical components in polarimeters, refractometers, and UV-Vis spectrophotometers
• Circulating heat transfer to jacketed glass reactors and pilot-scale bioreactors
• Viscosity measurement support for rotational rheometers and capillary viscometers
• Column oven replacement for HPLC and GC systems requiring stable +40–+120 °C operation
• Controlled curing of thermosetting resins and elastomers in materials science labs
• Accelerated aging studies per ASTM D573 and ISO 188 protocols

FAQ

Does the CD-BC4 support refrigeration?
No—the CD-BC4 is a heating-only circulation bath. For combined heating/cooling functionality, consider JULABO’s F25-HE or PRESTO A80 series.
Can I use ethylene glycol/water mixtures as the bath fluid?
Yes—provided the mixture’s boiling point exceeds 150 °C at operating pressure and its viscosity remains compatible with the pump’s 0.35 bar head pressure specification.
Is remote control possible without additional hardware?
Basic RS232 communication is built-in; however, a USB-to-serial adapter and LabSoft software are required for PC connectivity.
What is the minimum recommended fill level?
The float switch triggers at ~1.5 L; operation below this volume risks dry-heating damage and voids warranty coverage.
How often should ATC1 calibration be performed?
JULABO recommends annual verification against a NIST-traceable reference thermometer, especially after extended high-temperature use (>120 °C) or mechanical shock.