Hanuo DC-0506 Low-Temperature Constant-Temperature Circulating Bath

Overview

The Hanuo DC-0506 Low-Temperature Constant-Temperature Circulating Bath is a precision-engineered thermal management system designed for laboratory environments requiring stable, controllable, and uniform temperature fields across a broad operational range (−5 °C to 100 °C). It operates on a dual-mode thermoelectric refrigeration and resistive heating principle, enabling accurate setpoint maintenance with high reproducibility. The unit integrates a hermetically sealed compressor, PID-controlled heating elements, and a high-efficiency circulation pump to deliver consistent thermal output without manual intervention. Its primary function is to serve as an external temperature source or sink—either directly immersing samples in the bath or circulating conditioned fluid through external equipment such as viscometers, spectrophotometers, reaction jackets, or calorimeters. This makes it suitable for applications demanding tight thermal control under both static and dynamic heat-transfer conditions.

Key Features

• Stable temperature regulation with ±0.05 °C stability at setpoint, verified under standard ambient conditions (23 °C ±2 °C, <60% RH)
• 6-liter stainless-steel working bath with corrosion-resistant interior and integrated drain valve for rapid, spill-free fluid exchange
• Dual-path circulation architecture supporting both internal recirculation and external loop integration via quick-connect fittings
• Large backlit LCD interface with intuitive menu navigation, real-time display of actual/set temperatures, and programmable ramp-hold profiles
• Ergonomic design including side-mounted handles and non-marking casters (on larger models) for safe relocation within lab spaces
• Over-temperature, low-level, and dry-run protection circuits compliant with IEC 61010-1 safety standards for laboratory equipment

Sample Compatibility & Compliance

The DC-0506 accommodates a wide range of sample containers—including glass beakers, metal reaction vessels, and jacketed reactors—within its 250 mm × 200 mm × 150 mm bath chamber. Its external circulation port supports connection to third-party instrumentation with inlet/outlet diameters up to 10 mm, facilitating seamless integration into multi-instrument thermal control networks. The system meets essential regulatory expectations for research-grade thermal equipment: temperature accuracy and stability data are traceable to NIST-traceable reference probes; firmware logs include timestamped calibration events and fault records. While not certified for GMP manufacturing environments out-of-the-box, the device supports GLP-aligned workflows when used with documented SOPs, regular verification using calibrated thermistors (e.g., ASTM E74), and audit-ready operation logs exported via optional RS232/USB interface.

Software & Data Management

The DC-0506 operates autonomously via its embedded microcontroller and does not require proprietary software for basic functionality. However, optional PC connectivity enables remote monitoring and data logging through ASCII-based serial protocol (9600 baud, 8N1). Users may integrate temperature readings into LabVIEW, MATLAB, or custom Python scripts using standard serial libraries. All operational parameters—including setpoint history, alarm triggers, and cycle counts—are retained in non-volatile memory for post-experiment review. For laboratories operating under FDA 21 CFR Part 11 requirements, external validation tools (e.g., electronic lab notebooks with digital signature capability) can be employed to capture and archive session metadata, satisfying audit trail and accountability mandates.

Applications

• Material property testing: viscosity measurement (ASTM D445), coefficient of thermal expansion (ASTM E228), and phase transition analysis
• Biological assay support: enzyme kinetics studies, cell culture incubation pre-conditioning, and protein stability screening
• Chemical synthesis: exothermic reaction quenching, crystallization control, and reflux temperature stabilization
• Instrument calibration: serving as a stable thermal reference for IR thermometers, RTD verifiers, and thermal imaging systems
• Quality assurance: batch consistency verification in pharmaceutical excipient testing and polymer processing validation

FAQ

What fluids are compatible with the DC-0506 bath?
Deionized water, 30–50% ethylene glycol/water mixtures, and silicone oils up to 100 cSt viscosity are supported. Avoid halogenated solvents or highly corrosive media unless confirmed by chemical compatibility charts.
Can the unit maintain sub-zero temperatures continuously?
Yes—the compressor-based refrigeration system sustains −5 °C indefinitely under standard lab ventilation; ambient temperature above 30 °C may reduce cooling capacity.
Is external circulation flow rate adjustable?
Flow is fixed at 4 L/min but may be throttled externally using in-line needle valves; pressure drop across the external loop must remain below 0.15 MPa to ensure pump longevity.
How often should temperature calibration be performed?
We recommend quarterly verification using a NIST-traceable reference thermometer (e.g., Fluke 1523) per ISO/IEC 17025 guidelines, especially prior to critical experiments.
Does the DC-0506 support programming multiple temperature ramps?
No—the base model supports single-setpoint operation only; multi-step profiles require optional firmware upgrade or external controller integration.