Great Wall SY-20-160 High-Temperature Circulating Bath

Overview

The Great Wall SY-20-160 High-Temperature Circulating Bath is an engineered thermal management system designed for precise, stable, and safe delivery of elevated temperatures to external process equipment. It operates on the principle of forced convection using electric resistance heating and a high-efficiency circulation pump to transfer thermal energy via heat-transfer fluid (e.g., silicone oil or high-temperature synthetic fluid) through closed-loop external circuits. Unlike open-bath systems, the SY-20-160 employs a fully sealed architecture that minimizes fluid oxidation, evaporation, and contamination—critical for long-term operational reliability in continuous or batch-mode applications. Its operational range from ambient +5°C up to 160°C makes it suitable for demanding thermal processes where consistent heat input—not cooling—is the primary requirement. This unit is not a refrigerated chiller; it is a dedicated high-temperature heating source intended for integration with jacketed reactors, distillation columns, condensers, and other externally jacketed apparatuses requiring controlled thermal input.

Key Features

• Fully sealed closed-loop circulation system reduces thermal fluid degradation and extends service life under prolonged high-temperature operation
• PID-based digital temperature control ensures thermal stability within ±0.5°C across the full operating range (ambient +5°C to 160°C)
• Dual-mode circulation capability supports both internal bath recirculation and external loop delivery to connected equipment
• Integrated water-cooling interface enables rapid thermal adjustment: external cooling water can be introduced directly into the unit’s heat exchanger to accelerate cooldown cycles between runs
• LCD front-panel display provides real-time temperature readout, setpoint entry, and status indicators for system diagnostics
• Comprehensive safety architecture includes over-temperature cutoff, electronic overload protection, and over-current trip mechanisms compliant with IEC 61000-4 immunity standards
• Top-mounted exhaust valve simplifies routine maintenance—enabling safe, pressure-relieved replenishment of heat-transfer fluid without system depressurization

Sample Compatibility & Compliance

The SY-20-160 is compatible with standard industrial heat-transfer fluids rated for continuous operation at ≤160°C, including polydimethylsiloxane oils and aromatic hydrocarbon blends. It interfaces seamlessly with jacketed glass reactors (e.g., 1–50 L capacity), pilot-scale stainless-steel reactors, short-path distillation systems, and semiconductor wafer processing fixtures requiring uniform thermal boundary conditions. While not certified to UL or CE for standalone use in regulated GMP environments, its design adheres to foundational mechanical and electrical safety principles outlined in ISO 13857 (safety distances) and IEC 61010-1 (laboratory equipment safety). When deployed in validated pharmaceutical or chemical manufacturing workflows, users must perform IQ/OQ documentation per internal SOPs and align operational parameters with relevant sections of USP , ASTM E2500, and Annex 11 (computerized system validation) if integrated with automated control networks.

Software & Data Management

The SY-20-160 operates as a stand-alone analog/digital hybrid instrument with no embedded data logging or network connectivity. Temperature setpoints and real-time readings are managed exclusively via the front-panel LCD and tactile keypad. For laboratories requiring traceable thermal records, the unit supports optional analog 4–20 mA or 0–10 V output signals (available via factory configuration) for integration with external PLCs, SCADA systems, or data acquisition hardware. These outputs enable time-stamped temperature trending in compliance with GLP audit requirements. No proprietary software is provided; all external data handling follows user-defined protocols compliant with FDA 21 CFR Part 11 when used in regulated settings—requiring appropriate access controls, electronic signature implementation, and audit trail configuration on the receiving system.

Applications

• Heating jacketed pilot reactors during exothermic or endothermic synthesis in fine chemical and API manufacturing
• Maintaining precise thermal profiles in high-boiling-point solvent distillations (e.g., DMSO, NMP, ethylene glycol)
• Providing stable thermal input to catalytic hydrogenation systems operating above 100°C
• Supporting temperature-controlled crystallization studies in pharmaceutical development labs
• Thermal conditioning of sensor calibration rigs and material testing fixtures in metrology laboratories
• Process heating for small-scale food-grade thermal processing units requiring non-steam alternatives

FAQ

Is the SY-20-160 capable of refrigeration or sub-ambient operation?
No. This model is a heating-only circulating bath. It does not incorporate compression-based or Peltier cooling mechanisms.
What is the maximum allowable viscosity of heat-transfer fluid for reliable pump performance?
For optimal flow at 160°C, kinematic viscosity should remain below 50 cSt. Silicone oils meeting Dow Corning PM-704 or Shin-Etsu KF-96 specifications are recommended.
Can the unit be operated continuously at 160°C?
Yes—provided ambient ventilation meets minimum clearance requirements (≥15 cm on all sides) and cooling water (if used) is maintained at ≤25°C inlet temperature.
Does the SY-20-160 support RS485 or Ethernet communication protocols?
No. Communication is limited to analog signal outputs; digital interface modules are not available as standard or optional accessories.
Is third-party calibration certification included with shipment?
No. As supplied, the unit includes factory verification at three points (60°C, 100°C, 140°C) with traceable documentation. NIST-traceable calibration certificates require separate procurement and on-site verification.