SUNNY HENGPING DC Series Precision Refrigerated Circulating Bath
| Brand | SUNNY HENGPING INSTRUMENT |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Product Category | Domestic |
| Model | DC Series |
| Instrument Type | Refrigerated Circulating Bath |
| Circulation Mode | Internal Circulation |
| Temperature Control | Dual-mode (Heating & Cooling) |
| Bath Capacity | 6 L |
| Temperature Range | −5 °C to 95 °C |
| Temperature Stability | ±0.05 °C |
Overview
The SUNNY HENGPING DC Series Precision Refrigerated Circulating Bath is an engineered thermal management system designed for high-stability temperature control in laboratory and analytical applications. Based on a dual-compressor cascade refrigeration architecture, it delivers precise, rapid, and noise-optimized thermal regulation across a wide operational range—from sub-zero cooling (down to −80 °C in extended models) to high-temperature heating (up to 95 °C). The system operates on the principle of forced convection via internal recirculation, ensuring uniform thermal distribution throughout the bath medium—whether water, ethanol, silicone oil, or other compatible heat-transfer fluids. Its core function is to serve as a stable thermal source or sink for external equipment (e.g., viscometers, spectrophotometers, calorimeters, reaction blocks), enabling reproducible experimental conditions compliant with ISO/IEC 17025, ASTM E2877, and USP thermal calibration requirements.
Key Features
- Microprocessor-based PID temperature controller with Pt100 platinum resistance sensor (IEC 60751 Class A) for real-time feedback and adaptive thermal compensation
- Cascade refrigeration system with dual compressors and optimized heat exchanger design—enabling fast cooldown rates (e.g., −40 °C in <15 min from ambient) and low acoustic emission (<52 dB(A))
- High-efficiency polyurethane foam insulation applied via integral foaming process—minimizing thermal bridging and reducing energy consumption by up to 22% compared to conventional jacketed baths
- Ergonomic structural design including foldable side handles and heavy-duty locking casters (standard on DC-30xx and lower-temperature variants)
- Internal circulation pump with flow rate selectable between 8 L/min (models ≤20 L) and 10 L/min (≥20 L), supporting consistent horizontal and vertical thermal homogeneity (ΔT ≤ ±0.03 °C across bath volume)
- Digital display with 0.1 °C resolution and programmable ramp-soak profiles for multi-step thermal protocols
Sample Compatibility & Compliance
The DC Series accommodates a broad spectrum of non-corrosive, low-viscosity heat-transfer media—including deionized water, 30% ethylene glycol/water mixtures, and silicone oils (cSt ≤ 100 at 25 °C). It complies with IEC 61010-1:2010 safety standards for laboratory electrical equipment and meets electromagnetic compatibility (EMC) requirements per EN 61326-1. All units are factory-calibrated against NIST-traceable reference thermometers and support user verification per ISO/IEC 17025 Clause 6.5. For regulated environments (e.g., pharmaceutical QC labs), optional audit trail logging and password-protected parameter locking align with FDA 21 CFR Part 11 data integrity expectations.
Software & Data Management
While the base model operates via front-panel interface, optional RS232/RS485 communication ports enable integration with LabVIEW™, MATLAB®, or custom SCADA systems. Data logging (temperature setpoint, actual bath temp, error status) can be exported in CSV format at user-defined intervals (1–600 sec). Firmware supports firmware update via USB and includes built-in diagnostics for compressor cycle count, sensor drift alerts, and over-temperature lockout history—facilitating preventive maintenance planning and GLP/GMP documentation workflows.
Applications
- Calibration of temperature-sensitive analytical instruments (e.g., HPLC column ovens, UV-Vis cuvette holders, density meters)
- Thermal conditioning of samples prior to rheological, viscometric, or particle size analysis
- Stabilization of laser sources, detectors, and optical benches requiring sub-0.1 °C thermal drift control
- Controlled-rate cooling/heating in polymer crystallization studies and phase-transition experiments
- Supporting ASTM D2857 (intrinsic viscosity), ISO 1628-1 (viscosity number), and ISO 6425 (high-precision thermometer calibration) test protocols
FAQ
What is the minimum operating temperature for the DC-0506 model?
The DC-0506 achieves a stable setpoint down to −5 °C; for sub-zero operation below −10 °C, models such as DC-2006 or DC-4006 are recommended.
Can this bath be used with organic solvents like acetone or methanol?
No—acetone, methanol, and other highly volatile or corrosive solvents are incompatible due to material contact limitations (stainless steel 304 inner tank, silicone seals) and flash-point safety constraints.
Is external circulation possible without modification?
Standard DC Series units provide internal recirculation only; external circulation requires optional adapter kits (part no. DC-EXT-KIT) and compatible pump-rated tubing.
How often does the system require calibration verification?
Per ISO/IEC 17025, routine verification is recommended every 6 months using a traceable reference thermometer; annual full recalibration is advised for GxP environments.
Does the unit include over-temperature and low-level fluid protection?
Yes—integrated dry-run protection and dual-stage over-temperature cutoff (hardware + software) prevent heater damage and ensure operator safety.
