Hanuo DCW-0506 Horizontal Low-Temperature Constant-Temperature Circulating Bath

Overview

The Hanuo DCW-0506 is a horizontally configured, high-stability constant-temperature circulating bath engineered for precise thermal control in laboratory and analytical applications. It operates on a dual-mode refrigeration–heating principle using a hermetically sealed compressor-based cooling system coupled with PID-regulated electric heating elements. This architecture enables seamless temperature transitions and sustained thermal uniformity across the full operational range of −5 °C to 100 °C. Unlike vertical bath designs, the DCW-0506’s low-profile horizontal layout allows integration beneath fume hoods or within modular lab benches—optimizing footprint while maintaining accessibility to the bath chamber and circulation ports. Its core function is to serve as a stable thermal source or sink: either maintaining sample temperature directly within the stainless-steel bath chamber or delivering conditioned fluid via external recirculation to peripheral equipment (e.g., spectrophotometer cells, reaction jackets, or calorimetry modules).

Key Features

• Hermetically sealed refrigeration system with dual-stage overheat and overcurrent protection—ensuring long-term reliability and compliance with IEC 61000-4 electromagnetic compatibility standards.
• High-efficiency external circulation pump (6 L/min flow rate) supporting both internal temperature equilibration and external thermal transfer to auxiliary devices.
• XMT-series digital PID temperature controller with 0.1 °C resolution, real-time display, and programmable ramp/soak profiles—meeting calibration traceability requirements per ISO/IEC 17025.
• 304 stainless-steel inner tank and work surface—resistant to corrosion from water, ethylene glycol/water mixtures, and mild organic solvents; compliant with USP extractables testing protocols for lab-grade materials.
• Horizontal chassis design (250 × 200 × 150 mm internal dimensions) optimized for under-bench installation; front-access drain valve and side-mounted inlet/outlet ports simplify fluid line routing.
• Thermal stability of ±0.05 °C at setpoint (measured at center of bath volume per ASTM E1137/E1137M), verified using NIST-traceable platinum resistance thermometers (PRTs).

Sample Compatibility & Compliance

The DCW-0506 accommodates a broad spectrum of sample configurations: open vessels immersed directly in the bath medium, jacketed reactors connected via external tubing, or temperature-sensitive detectors requiring remote thermal coupling. Compatible heat-transfer fluids include deionized water, 30/70 ethylene glycol–water mixtures (for sub-zero operation), and silicone oils up to 100 °C. The unit complies with CE marking directives (2014/30/EU EMC and 2014/35/EU LVD), RoHS 2011/65/EU material restrictions, and conforms to safety requirements outlined in UL 61010-1 (Ed. 3). For regulated environments—including pharmaceutical QC labs operating under FDA 21 CFR Part 11—the optional data logging module supports audit-trail-enabled temperature recording with user authentication and electronic signature capability.

Software & Data Management

While the DCW-0506 operates autonomously via its embedded XMT controller, it features an RS485 serial interface (Modbus RTU protocol) for integration into centralized lab automation systems. Third-party SCADA platforms or custom Python/LabVIEW scripts can poll real-time temperature, setpoint, and status flags at configurable intervals (1–60 s). Optional USB-to-RS485 adapters enable direct connection to Windows-based PCs running Hanuo’s free PC Monitor Suite—providing time-stamped CSV export, alarm history, and deviation trend analysis. All logged data retain metadata including operator ID, instrument serial number, and environmental timestamp—supporting GLP/GMP documentation workflows.

Applications

• Calibration of thermistors, RTDs, and infrared sensors against NIST-traceable references.
• Temperature-controlled kinetic studies in chemical synthesis and enzymatic assays.
• Stabilization of optical components in UV-Vis and FTIR spectrometers during spectral acquisition.
• Cooling of HPLC column ovens, autosampler trays, and detector flow cells to minimize thermal drift.
• Pre-conditioning of polymer samples prior to DSC or rheological testing per ISO 6721 and ASTM D3418.
• Support of ASTM D97 pour point determinations and D2500 cloud point measurements in petrochemical testing.

FAQ

What is the maximum external load capacity for the circulation system?
The integrated pump delivers up to 6 L/min at ≤0.2 bar backpressure—sufficient for single-loop configurations up to 15 m of 6-mm OD PTFE tubing with standard fittings.
Can the bath operate continuously at −5 °C using only water as the medium?
No. Pure water freezes at 0 °C; operation below 0 °C requires a miscible antifreeze solution (e.g., 30% v/v ethylene glycol in deionized water), validated for thermal conductivity and viscosity per ASTM D1121.
Is the temperature sensor calibrated at the factory, and is recalibration supported onsite?
Each unit ships with a factory calibration certificate (±0.03 °C uncertainty at 25 °C). Field recalibration is performed via the controller’s offset adjustment mode using a certified reference thermometer per ISO/IEC 17025 procedures.
Does the unit meet noise emission limits for quiet laboratory zones?
Yes. Sound pressure level is ≤52 dB(A) at 1 m distance—compliant with ISO 7779 and suitable for shared instrumentation rooms.
What maintenance intervals are recommended for optimal performance?
Compressor oil and refrigerant integrity should be verified annually; circulation pump impeller and seals inspected every 24 months; stainless-steel tank passivated quarterly if used with saline or acidic solutions.