The Wuxi Guanya SUNDI series is an explosion-proof PID temperature control system designed for industrial heating and cooling processes in hazardous environments. As a complete closed-loop thermal management solution—not merely a temperature controller—the SUNDI integrates a refrigerant compressor, electric heater, circulating pump, expansion vessel, and PLC-based control system into a single unit. It serves as a dynamic temperature source for jacketed reactors, microchannel reactors, distillation columns, and material testing chambers, delivering precise temperature control from -120 °C to +350 °C depending on the model selected.

Feed-Forward PID & Multi-Mode Temperature Control

• Feed-Forward PID with Self-Building Tree Algorithm: Unlike conventional PID controllers that react to temperature deviations after they occur, the SUNDI's feed-forward algorithm anticipates changes in heat load—particularly during exothermic or endothermic reaction phases—and adjusts heating or cooling output proactively. The model-free self-building tree algorithm continuously refines the control model during operation without manual tuning.
• Selectable Control Modes: The operator can switch between process temperature control (directly regulating the reactor material temperature via an external PT100 probe, 4-20 mA signal, or digital communication) and jacket oil temperature control (regulating the circulating heat transfer medium temperature). A differential temperature control mode allows setting and controlling the temperature difference between the jacket oil and the reaction material to prevent thermal shock.
• Control Accuracy: Heat transfer medium temperature control accuracy is ±0.5 °C; reactor material temperature control accuracy is ±1 °C. For models up to 25 kW heating power, an optional high-precision configuration achieves ±0.1 °C on both the medium and the material.

Explosion-Proof Configurations & Hazardous Area Operation

• Isolated Explosion-Proof (BT4, CT4): The electrical control cabinet and power components are housed in certified explosion-proof enclosures rated for Class II BT4 or CT4 hazardous gas environments, suitable for chemical and pharmaceutical plants where flammable solvents or gases may be present.
• Positive Pressure Purged Explosion-Proof: An alternative configuration uses a purged and pressurized enclosure to prevent flammable gases from reaching electrical components, suitable for larger systems where individual component certification is impractical.
• Customized Solutions: Explosion-proof configurations are built to order based on the specific hazardous area classification, temperature class, and gas group requirements of the installation site.

Closed Circulation & Process Safety

• Fully Closed Circulation System: The entire thermal fluid circuit is sealed from the atmosphere. At high temperatures, there is no oil mist emission into the workplace; at low temperatures, the system does not absorb moisture from ambient air. The expansion vessel's contents do not participate in the circulating loop, minimizing thermal fluid oxidation and degradation over extended operation.
• Multi-Layer Safety Protection: Self-diagnosis function, compressor overload protection, high-pressure pressure switch, overload relay, thermal protection device, liquid level protection, and high-temperature fault protection are standard across the series.
• Direct High-Temperature Cooling: The system can initiate cooling directly from 300 °C without an intermediate cool-down step, a critical capability for processes that require rapid thermal cycling.

Program Editor, Communication & Integration

• Programmable Sequences: The PLC controller supports up to 20 programs with up to 40 segments per program (model-dependent), enabling automated temperature profiling for multi-step synthesis, crystallization, or material aging protocols.
• MODBUS RTU RS 485: Standard communication interface for integration with plant DCS, SCADA, or PLC systems. An optional Ethernet interface and external touch screen controller are available.
• 7″ or 10″ TFT Touch Screen: Color graphic display shows setpoint, actual temperature, temperature curve trend, and alarm status. Data export to Excel format is supported for batch record keeping.

Model Range & Scalability

• Temperature Ranges (Series Variants): -10 °C to +150 °C, -25 °C to +200 °C (expandable to +300 °C), -30 °C to +180 °C, -45 °C to +250 °C, -60 °C to +250 °C, and -120 °C to +350 °C.
• Cooling Capacity: From 0.5 kW to 1200 kW, covering laboratory-scale glass reactors through production-scale industrial reactors.
• Heating Power: From 2 kW to 200 kW, sized to match the thermal demand of the target process.
• Circulation Pump: Magnetic drive pump with no shaft seal leakage; flow rates from 10 L/min to 600 L/min across models.

Typical Applications

• High-pressure reactor dynamic heating and cooling temperature control
• Double-layer glass and metal reactor jacket temperature regulation
• Microchannel reactor precise temperature management
• Distillation system and small-scale pilot plant temperature control
• Material low/high-temperature aging and thermal cycling tests
• Semiconductor equipment cooling and heating
• Vacuum chamber temperature control
• Combinatorial chemistry and process development