Great Wall SY-50-160 High-Temperature Circulating Bath

Overview

The Great Wall SY-50-160 High-Temperature Circulating Bath is an externally recirculating, electrically heated thermal management system engineered for precise and stable heat delivery to external process equipment. Unlike immersion-style baths, this unit operates as a closed-loop fluid delivery system—pumping temperature-controlled silicone oil or high-flash-point heat transfer fluid through insulated tubing to jacketed reactors, glassware, or custom heating manifolds. Its operational principle relies on resistive heating elements integrated into a stainless steel heat exchanger core, coupled with a robust centrifugal circulation pump and PID-driven digital temperature controller. The system is optimized for applications requiring sustained operation above 100°C—particularly where open-bath evaporation, oxidation, or fluid degradation must be avoided. With a maximum setpoint of 160°C and a minimum operating point just 5°C above ambient, it bridges the gap between standard water baths and high-temperature oil circulators used in pilot-scale synthesis and process validation.

Key Features

• 50-liter sealed stainless steel reservoir with reinforced gasketed lid and integrated fill/vent valve for safe, low-oxygen fluid charging and degassing
• High-efficiency axial-flow circulation pump rated for continuous duty at temperatures up to 160°C; flow rate adjustable via calibrated bypass valve (typical output: 15–25 L/min at 3 bar)
• PID-based digital temperature controller with dual-sensor input (bath sensor + optional external probe input) enabling cascade control configurations
• Over-temperature cut-off circuit with independent mechanical thermostat backup; thermal fuse protection embedded in heater assembly
• Electrical safety compliance: IP20 enclosure rating, grounded chassis, CE-marked power supply (220 V AC, 50 Hz, 6.5 kW max load)
• Corrosion-resistant wetted parts: 304 stainless steel tank, pump housing, piping, and fittings; compatible with Dow Corning PMX-200, Marlotherm SH, and similar synthetic heat transfer fluids

Sample Compatibility & Compliance

The SY-50-160 is not designed for direct sample immersion but serves as a primary heat source for externally connected apparatus—including jacketed flasks, stirred-tank reactors, distillation columns, and calorimetry cells. Its sealed-loop architecture prevents fluid oxidation and minimizes vapor loss, supporting extended use under inert gas blankets (e.g., N₂-purged systems). While not certified to UL/CSA standards, its electrical design adheres to IEC 61010-1:2010 requirements for laboratory equipment. For regulated environments, the unit supports basic audit readiness: temperature setpoints and alarm events are logged locally (non-volatile memory), and all safety interlocks meet GLP-aligned functional safety expectations. It is routinely deployed in facilities compliant with ISO 9001:2015 and follows documented maintenance protocols aligned with ASTM E2912–22 (Standard Guide for Thermal Stability Testing of Heat Transfer Fluids).

Software & Data Management

The SY-50-160 operates via a front-panel LCD interface with tactile membrane keys and real-time display of bath temperature, setpoint, pump status, and alarm history. Optional RS485 Modbus RTU output enables integration into SCADA or LabVantage systems for remote monitoring and scheduled ramp/soak profiles. Data logging is limited to internal event timestamps (alarm triggers, power-on cycles); continuous temperature recording requires external DAQ hardware. No cloud connectivity or FDA 21 CFR Part 11-compliant electronic signatures are provided—consistent with its classification as a Class I laboratory support instrument per GAMP 5 guidance.

Applications

• Heating of jacketed 5–50 L glass reactors in API intermediate synthesis and polymerization studies
• Thermal conditioning of HPLC column ovens and viscometer thermostats requiring stable >100°C environments
• Process validation support for autoclave pre-heating, sterilization cycle development, and dissolution apparatus calibration
• Material testing setups involving thermomechanical analysis (TMA), dynamic mechanical analysis (DMA), or hot-stage microscopy
• Calibration of temperature sensors (RTDs, thermocouples) across extended ranges per ISO/IEC 17025 Clause 6.5.2

FAQ

Is the SY-50-160 suitable for use with water as the heat transfer fluid?

No—water is not recommended above 95°C due to vapor pressure, scaling, and accelerated corrosion. Use only approved synthetic heat transfer oils rated for continuous service at 160°C.
Can the unit be integrated with a programmable logic controller (PLC)?

Yes, via optional RS485 Modbus RTU interface; register mapping documentation is supplied with firmware version 2.3+.
Does the system include insulation for external tubing?

No—external insulation must be installed separately to minimize heat loss and surface temperature hazards; mineral wool or closed-cell elastomeric sleeves are advised.
What maintenance intervals are recommended?

Fluid level and visual inspection every 200 operating hours; full fluid replacement and pump seal check every 2,000 hours or annually, whichever occurs first.
Is the temperature stability of ±2°C verified under load?

Yes—the specification reflects steady-state deviation measured at the outlet port while delivering 20 L/min flow to a 10 kW thermal load, per internal test protocol GW-TC-160-03.