The Great Wall SY-50 Circulating Bath

Overview

The Great Wall SY-50 Circulating Bath is a precision-engineered constant-temperature thermal management system designed for laboratory-scale heat transfer applications requiring stable, uniform, and controllable thermal environments. Operating on the principle of forced convection via an integrated high-capacity circulation pump, the unit maintains consistent temperature distribution both within its 50 L stainless steel reservoir and throughout externally connected apparatus—such as reactors, condensers, or analytical instruments—via dual internal/external recirculation pathways. Its operational range spans from ambient +5 °C up to 200 °C, making it suitable for both water-based and high-boiling-point oil-based thermal media. Engineered for reliability in continuous-duty settings, the SY-50 features a robust 3-phase 380 V power architecture, enabling stable performance under prolonged heating cycles without thermal drift beyond ±0.5 °C.

Key Features

• High-temperature-resistant stainless steel shielded circulation pump (SUS304 construction), ensuring leak-free operation and extended service life at elevated temperatures.
• PID-based digital temperature controller with LED display for precise setpoint regulation and real-time monitoring; algorithm optimized for minimal overshoot and rapid thermal equilibration.
• 6000 W high-efficiency heating element sourced from certified ODM suppliers, compliant with GB/T standards for electrical safety and thermal durability.
• Large-diameter (Φ500 mm) open-top bath chamber fabricated from food-grade SUS304 stainless steel, facilitating easy filling, cleaning, and immersion of large-volume or irregularly shaped samples.
• Mobile upright chassis equipped with locking casters for flexible repositioning across lab benches, fume hoods, or process workstations.
• Dual 3/4″ external circulation ports fitted with insulated stainless steel flexible hoses, enabling direct integration with jacketed reactors, calorimeters, or other temperature-sensitive instrumentation.

Sample Compatibility & Compliance

The SY-50 accommodates a broad spectrum of thermal media—including deionized water, silicone oils, glycol-water mixtures, and mineral oils—without degradation of structural integrity or thermal performance. Its all-stainless-steel wetted path (pump head, tubing, bath tank, and fittings) ensures compatibility with mildly corrosive or organic solvents commonly used in synthesis, extraction, and material testing workflows. While not intrinsically certified for hazardous area use, the unit meets general laboratory safety requirements per GB 4793.1–2007 (equivalent to IEC 61010-1) for electrical equipment for measurement, control, and laboratory use. Its design supports GLP-compliant documentation practices through stable, repeatable temperature profiles and traceable operational parameters.

Software & Data Management

The SY-50 operates as a standalone analog/digital hybrid instrument with no embedded software or network interface. Temperature setpoints, real-time readings, and status indicators are managed exclusively via the front-panel LED interface and tactile controls. For laboratories requiring electronic data capture or audit trails, optional third-party data loggers (e.g., Omega OM-DAQPRO-5300 or Keysight 34972A) may be interfaced via analog voltage output (0–5 V or 4–20 mA, configurable upon request). Though lacking native 21 CFR Part 11 compliance, the unit’s mechanical stability and deterministic PID response support validated protocols when paired with external compliant recording systems.

Applications

• Temperature control of jacketed glass reactors during exothermic/endothermic chemical syntheses.
• Calibration of thermocouples, RTDs, and infrared sensors across extended thermal ranges.
• Stabilization of optical components, spectrophotometer cuvettes, or laser diodes requiring low-drift thermal conditioning.
• Accelerated aging studies of polymers, adhesives, and coatings under controlled thermal stress.
• Pre-heating and thermal equilibration of samples prior to rheological, viscometric, or DSC analysis.
• Supporting distillation, reflux, and Soxhlet extraction setups where consistent bath temperature directly impacts separation efficiency and reproducibility.

FAQ

What types of fluids can be used in the SY-50 bath?

Deionized water, silicone oils (up to 200 °C), ethylene glycol/water blends, and mineral oils are compatible. Avoid halogenated solvents or strong acids unless verified for stainless steel compatibility.
Is external temperature feedback supported for closed-loop control?

No—the SY-50 uses internal Pt100 sensor feedback only. External probe input is not available in standard configuration.
Can the unit operate continuously at 200 °C?

Yes, provided proper ventilation, fluid level maintenance, and periodic inspection of pump seals and insulation integrity are performed per manufacturer guidelines.
Does the circulation pump support variable flow rate adjustment?

No—the pump operates at fixed speed delivering 30 L/min nominal flow; flow modulation requires external valves or bypass circuits.
What is the maximum allowable ambient temperature for safe operation?

The unit is rated for ambient environments up to 35 °C with ≥15 cm clearance on all sides for convective cooling of the heater enclosure.