The Great Wall SY-20 Circulating Bath

Overview

The Great Wall SY-20 Circulating Bath is an engineered thermal management system designed for precise, stable, and continuous temperature control in laboratory and pilot-scale applications. Operating on the principle of forced convection via a high-reliability circulation pump, it maintains uniform thermal distribution across both internal bath fluid and externally connected equipment—such as reactors, condensers, viscometers, or analytical instruments—through dual-mode (internal + external) fluid circulation. Its operational range spans from ambient +5 °C up to 200 °C, supporting both water-based and oil-based heat transfer media. Constructed with industrial-grade SUS304 stainless steel throughout the bath chamber, piping, and circulation manifold, the unit ensures long-term resistance to thermal degradation, chemical exposure, and mechanical stress under sustained elevated temperatures.

Key Features

• High-temperature-rated stainless steel shielded circulation pump (280 W), engineered for zero leakage at 200 °C and rated for continuous duty with 30 L/min flow capacity and 1 bar maximum head pressure.
• PID-based digital temperature controller with LED display, delivering ±0.5 °C stability across the full operating range—validated per IEC 61000-4-30 for electromagnetic compatibility and thermal repeatability.
• Robust heating system featuring ODM-sourced, UL-recognized heating elements (2450 W total), compliant with GB/T 20044–2019 (Chinese national standard for electrical safety in laboratory equipment).
• Large-diameter bath opening (Φ350 × 220 mm) facilitates easy sample insertion, probe placement, and routine cleaning; integrated leveling feet and dual-locking casters enable stable positioning and safe relocation within shared lab spaces.
• Standardized 3/4″ NPT external circulation ports with insulated stainless steel flexible hoses included—designed for secure, low-thermal-loss connection to third-party equipment without adapter requirements.
• Full-SUS304 construction—including tank, pump housing, inlet/outlet manifolds, and support frame—meets ASTM A240/A240M specifications for corrosion-resistant austenitic stainless steel used in controlled-environment instrumentation.

Sample Compatibility & Compliance

The SY-20 accommodates a wide range of thermal transfer fluids, including deionized water, silicone oils (e.g., Dow Corning 200 Fluid series), and glycol-water mixtures, with viscosity limits up to 1000 cSt at operating temperature. Its design supports GLP-compliant workflows: temperature setpoints, actual bath readings, and runtime logs can be manually recorded for audit trails. While the unit itself does not include electronic data logging or 21 CFR Part 11 compliance features, its stable thermal output enables integration into validated systems where external data acquisition (e.g., via PT100 sensors and SCADA-compatible DAQ modules) meets ISO/IEC 17025 or FDA-regulated process validation requirements.

Software & Data Management

The SY-20 operates as a standalone analog/digital hybrid instrument with no embedded firmware or network interface. All control and monitoring are performed locally via the front-panel LED display and tactile push-button interface. No proprietary software, drivers, or cloud connectivity are provided. For laboratories requiring automated data capture, the unit’s analog temperature output (0–5 V or 4–20 mA, optional upon request) supports integration with third-party data loggers, PLCs, or LabVIEW-based acquisition systems—enabling timestamped thermal profiling, alarm triggering, and CSV export compatible with LIMS platforms.

Applications

• Temperature stabilization of rotary evaporators, jacketed glass reactors, and cold finger condensers in synthetic chemistry labs.
• Calibration and verification of thermocouples, RTDs, and infrared thermometers across extended temperature ranges (per ASTM E77 and ISO 17025 Clause 6.4.7).
• Material testing environments requiring consistent thermal loading—for example, polymer melt index determination (ASTM D1238), viscosity benchmarking (ASTM D445), or accelerated aging studies (IEC 60068-2-2).
• Pre-heating and thermal equilibration of samples prior to FTIR, DSC, or TGA analysis—minimizing thermal lag and improving measurement reproducibility.
• Supporting bioreactor jacket temperature control in non-GMP research settings where open-loop or manually supervised thermal regulation is acceptable.

FAQ

Does the SY-20 support refrigeration or cooling capability?
No. The SY-20 is a heating-only circulating bath. It does not incorporate compressor-based or Peltier cooling circuits. For combined heating/cooling applications, consider The Great Wall’s separate CH series chillers or dual-temperature circulators.
Can this unit be used with silicone oil at 200 °C continuously?
Yes—provided the selected oil grade (e.g., Dow Corning 200 Fluid, 50 cSt or 100 cSt) is rated for continuous operation at 200 °C and maintained below its flash point. Regular fluid inspection and replacement per manufacturer guidelines are recommended.
Is the external circulation port compatible with standard laboratory tubing?
The 3/4″ NPT female thread accepts industry-standard compression fittings and reinforced silicone or PTFE-lined hoses. Adapters for 1/2″ or 3/8″ OD tubing are commonly available and field-installable.
What maintenance is required for long-term reliability?
Monthly visual inspection of pump seal integrity, quarterly cleaning of the bath interior with mild detergent and deionized water, and annual verification of PID calibration using a traceable reference thermometer (e.g., Fluke 1523 with 0.02 °C uncertainty).
Does the unit meet CE or UL certification requirements?
The SY-20 complies with GB 4793.1–2019 (equivalent to IEC 61010-1:2010) for safety in laboratory electrical equipment. CE marking is not applied; UL listing is not available. Export configurations may include additional regional certifications upon special order.