Hanuo DC-0515 Low-Temperature Constant-Temperature Circulating Bath
| Brand | Hanuo |
|---|---|
| Origin | Shanghai, China |
| Model | DC-0515 |
| Type | Constant-Temperature Bath |
| Circulation | Internal & External |
| Temperature Control | Refrigeration & Heating |
| Bath Volume | 15 L |
| Temperature Range | −5 °C to 100 °C |
| Temperature Stability | ±0.05 °C |
Overview
The Hanuo DC-0515 Low-Temperature Constant-Temperature Circulating Bath is an engineered thermal management system designed for precise, stable temperature control in laboratory and analytical applications. It operates on a closed-loop refrigeration principle using a hermetically sealed compressor, integrated with electric heating elements to enable bidirectional temperature regulation across a wide operational range (−5 °C to 100 °C). The unit maintains high thermal uniformity and minimal drift (±0.05 °C) through a digital PID feedback control algorithm—implemented via the XMT-series microprocessor controller—which continuously monitors bath temperature and dynamically adjusts cooling/heating output. This architecture ensures reproducible thermal conditions essential for calibration, material testing, spectroscopic sample conditioning, and reaction kinetics studies where ambient or process-induced thermal fluctuations must be rigorously suppressed.
Key Features
- Hermetically sealed refrigeration system with dual overheat and overcurrent protection circuits for long-term operational safety and reliability.
- High-flow external circulation pump (rated at 4 L/min) enabling precise temperature transfer to external devices such as viscometers, calorimeters, or custom reaction jackets.
- Stainless steel inner tank and work surface (304 grade) offering corrosion resistance, ease of cleaning, and compliance with GLP hygiene standards.
- Digital LED temperature display with real-time setpoint and actual bath temperature readout; intuitive keypad interface for rapid parameter adjustment.
- Internal thermostat design supports both direct immersion experiments and secondary temperature-controlled environments via external fluid routing.
- Compact vertical footprint optimized for benchtop integration without compromising thermal mass or stability—ideal for space-constrained QC labs and R&D facilities.
Sample Compatibility & Compliance
The DC-0515 accommodates a broad spectrum of sample containers—including glass jacketed reactors, metal sample holders, and polymer-based cuvettes—provided they are compatible with aqueous or water-glycol coolant mixtures (recommended for sub-zero operation). Its stainless steel construction meets ISO 8573-1 purity class requirements for non-contaminating fluid contact surfaces. While not certified to specific FDA 21 CFR Part 11 or EU Annex 11 standards out-of-the-box, the device supports audit-ready operation when paired with validated SOPs and external electronic log systems. It conforms to IEC 61010-1:2010 for electrical safety in laboratory equipment and complies with CE marking directives for electromagnetic compatibility (EMC) and low-voltage operation.
Software & Data Management
The DC-0515 operates as a standalone analog-digital hybrid instrument with no embedded data logging or network connectivity. However, its analog voltage output (0–5 V or 4–20 mA, configurable per OEM specification) allows integration into third-party SCADA, LabVIEW, or PLC-based monitoring platforms for time-stamped temperature trending and remote alarm triggering. For regulated environments requiring traceability, users may implement external USB or RS-232 data acquisition modules compliant with ASTM E2915–22 (Standard Guide for Validation of Thermal Analysis Systems), enabling full audit trails including setpoint history, deviation alerts, and maintenance logs aligned with GLP/GMP documentation practices.
Applications
- Calibration of thermocouples, RTDs, and infrared sensors against NIST-traceable reference standards.
- Thermal preconditioning of polymers, adhesives, and pharmaceutical excipients prior to rheological or DSC analysis.
- Stabilization of optical components (e.g., lasers, spectrophotometer cells) to minimize thermal lensing effects.
- Controlled-rate cooling/heating cycles in enzymatic activity assays and protein denaturation studies.
- Supporting ASTM D2196 (viscosity of non-Newtonian materials) and ISO 2555 (solution viscosity) test protocols via constant-temperature sample baths.
- Integration with HPLC column ovens, GC injectors, and automated titrators requiring auxiliary thermal regulation.
FAQ
What coolant fluids are recommended for operation below 0 °C?
A 30–50% aqueous solution of ethylene glycol or propylene glycol is recommended; avoid methanol or acetone due to volatility and material compatibility risks.
Can the DC-0515 maintain temperature stability during extended unattended operation?
Yes—its robust compressor duty cycle management and PID tuning ensure continuous stability for >72 h under nominal load, provided ambient room temperature remains within 18–28 °C and ventilation clearances are maintained.
Is external circulation flow rate adjustable?
No—the pump delivers a fixed nominal flow of 4 L/min; variable-speed control requires aftermarket flow regulators installed in the external loop.
Does the unit support RS-485 or Ethernet communication?
Not natively; communication capability requires optional analog output expansion or external protocol converters.
What is the maximum allowable external load volume for stable temperature transfer?
For ≤±0.1 °C stability at the remote site, external loop volume should not exceed 3× the bath capacity (i.e., ≤45 L), assuming insulated tubing and minimal heat loss.
