Great Wall SY-100-250 High-Temperature Circulating Bath

Overview

The Great Wall SY-100-250 High-Temperature Circulating Bath is an industrial-grade, closed-loop thermal management system engineered for precise and stable temperature control in demanding laboratory and pilot-scale applications. Designed around a robust heating-only architecture with integrated external circulation capability, it delivers consistent thermal energy transfer across a wide operational range—from ambient +5°C up to 250°C—making it suitable for high-temperature reaction baths, jacketed reactor conditioning, material testing fixtures, and calibration standards requiring long-term thermal stability. Its core operating principle relies on forced convection via a high-capacity stainless steel centrifugal pump, circulating thermally stable bath fluid (e.g., silicone oil, glycol-water mixtures, or specialized high-temp heat transfer fluids) through both internal reservoir and externally connected equipment. PID-based digital temperature regulation ensures minimal thermal drift (±0.5°C), while the fully sealed circulation path minimizes fluid degradation, oxidation, and evaporation at elevated temperatures—critical for reproducible long-duration experiments under GLP or ISO/IEC 17025-compliant workflows.

Key Features

• High-precision PID temperature controller with backlit LCD interface for real-time monitoring and setpoint adjustment
• Hermetically sealed circulation system constructed entirely from SUS304 stainless steel—resistant to corrosion, thermal fatigue, and chemical ingress from common heat transfer media
• Oxygen-free copper cooling coil integrated into the expansion tank, enabling rapid cooldown from 250°C to ambient via external chilled water supply (optional auxiliary chiller integration supported)
• Dual-mode circulation: configurable internal recirculation for bath homogeneity or external loop connection (via standard 3/4″ NPT ports) for temperature control of external vessels, reactors, or analytical instrumentation
• Integrated safety architecture including over-temperature cutoff, motor overload protection, emergency stop button, and audible/visual alarm activation
• Transparent glass level gauge with calibrated scale for continuous visual verification of bath fluid volume—prevents dry-run operation and thermal damage to heater elements
• Self-venting fill port (Φ60 mm) and dedicated exhaust valve for safe, controlled fluid addition and air purging during commissioning or maintenance

Sample Compatibility & Compliance

The SY-100-250 accommodates a broad spectrum of thermally stable bath fluids—including silicone oils (up to 300°C flash point), polyalkylene glycols, and high-boiling-point synthetic heat transfer liquids—subject to compatibility verification per manufacturer specifications. It meets structural and electrical safety requirements per GB/T 12801–2022 (General Rules for Safety in Production Processes) and conforms to IEC 61000-6-2/6-4 electromagnetic compatibility standards. While not certified for use in hazardous locations (e.g., ATEX or IECEx), its design supports integration into ISO 9001-certified quality systems and aligns with foundational elements of FDA 21 CFR Part 11 data integrity expectations when paired with compliant logging software. All wetted components comply with USP Class VI biocompatibility criteria for non-contact fluid handling applications.

Software & Data Management

The unit operates as a standalone analog/digital hybrid controller without embedded Ethernet or USB connectivity; however, its 0–10 V analog output signal (proportional to actual temperature) enables seamless integration with third-party data acquisition systems (e.g., LabVIEW, Delta Tau PMAC, or Siemens S7 PLCs) for time-stamped logging, remote supervision, and audit trail generation. Optional RS485 Modbus RTU interface kits are available from authorized distributors for protocol-based communication. When deployed in regulated environments, users may implement external validation protocols—including IQ/OQ documentation, temperature mapping studies per ASTM E2874, and periodic calibration against NIST-traceable reference thermometers—to satisfy GLP, GMP, or ISO/IEC 17025 traceability requirements.

Applications

• Temperature conditioning of jacketed glass reactors and pilot-scale bioreactors (1–20 L capacity)
• Thermal stabilization of spectrophotometer cells, viscometers, and DSC sample holders
• Accelerated aging tests for polymers, adhesives, and electronic encapsulants per ASTM D3045 and ISO 2578
• Calibration of industrial RTDs, thermocouples, and infrared sensors across extended temperature ranges
• Material property evaluation—including coefficient of thermal expansion (CTE) measurements and creep testing fixtures
• Support of solvent reflux systems requiring precise upper-temperature limits and vapor pressure management

FAQ

What types of heat transfer fluids are compatible with the SY-100-250?

Silicone oils (e.g., Dow Corning 200 Fluid series), polydimethylsiloxane-based fluids, and high-flash-point synthetic heat transfer oils meeting ASTM D6722 specifications are recommended. Avoid mineral oils above 180°C due to oxidative instability.
Can this unit be used for cooling below ambient temperature?

No—it is a heating-only circulator. However, the built-in copper cooling coil allows passive or active water-assisted cooldown from 250°C to room temperature; sub-ambient operation requires an external chiller connected to the coil.
Is the external circulation pressure sufficient for tall column setups?

With a maximum head pressure of 1.5 bar and flow rate of 75 L/min, it supports vertical lift heights up to approximately 15 meters in low-viscosity fluid configurations; consult hydraulic resistance calculations for your specific loop geometry.
How often should the bath fluid be replaced?

Under continuous operation at ≤200°C with proper sealing and inert atmosphere (if applicable), fluid service life exceeds 12 months; visual inspection for discoloration, sediment, or viscosity change is advised every 3 months.
Does the unit support validation documentation for regulated labs?

Yes—the mechanical design, material certifications (SUS304 mill test reports), and electrical safety compliance facilitate IQ/OQ execution. Full PQ must be performed in situ using user-defined acceptance criteria aligned with ISO/IEC 17025 clause 5.10.