Refrigerated heating circulator HRHC-625W

for high temperatures

Product overview
The HRHC series Hermetic Refrigerating & Heating Circulator provides refrigerated and heated closed-loop liquid circulation for dynamic temperature control of samples and process equipment over a wide working range (typical configurations from -60°C to +250°C). The system is designed for precise, repeatable temperature control in laboratory and pilot applications.

Application
HRHC units can be connected to jacketed reactors, glass reactors, autoclaves, pilot plants, mini-plant systems, scale-up operations, double-wall reactors, advanced-flow reactors, distillation and vacuum systems, material testing rigs and semiconductor process chambers.

Advantages & functions

• Hermetic circulation minimizes contamination and extends circulating fluid life.
• Wide operating temperature ranges across configurations (examples include ranges up to -100°C to +350°C in select configurations without fluid change).
• Intelligent feed-forward PID control for high stability and reproducibility.
• Plate heat exchangers and optimized heating pipelines for improved heating and cooling rates.
• Cooling power scalable from ~0.5 kW to several hundred kW depending on model.
• Optional 4", 7" or 10" TFT touch-screen graphic displays.
• Comprehensive alarms and safety functions.
• Rapid cooldown from high temperatures.
• Optional remote communication and control software with extended communication distance.
• Compact footprint for laboratory or plant integration.

Structure design
The system uses a fully closed piping design with a high-efficiency plate heat exchanger and an expansion vessel with temperature limitation to reduce volatilization and air contact. Benefits include:

• Only the medium in the expansion vessel contacts air (vessel limited to ~60°C) reducing volatilization risk.
• No volatilization of heat transfer medium at high operating temperatures.
• No need to change heat transfer medium for continuous control across broad temperature ranges (examples: -80°C~190°C, -70°C~220°C, -88°C~170°C, -55°C~250°C, -30°C~300°C depending on configuration) without pressure rise.

Display / control functions

• Process temperature displays (material and jacket).
• Liquid level indicator for expansion vessel.
• Status indicators for refrigeration system, heater and circulation pump.
• Selectable temperature control modes (material and heat transfer medium).
• Upper and lower temperature limit settings.
• Delta-temperature setting between jacket and reactor material.
• Low liquid level alarm.
• Compressor manual/auto selection.
• Temperature curve display with zoom and export capability.
• Recipe/program setup and alarm log display.

Control principle
The controller uses a dual PID loop (master and slave) with feed-forward to reduce lag and overshoot: master PID output combined with feed-forward generates slave setpoints, enabling accurate control of temperature gradients and fast response to setpoint changes.

Circulation pump
High-temperature-resistant magnetic drive pumps or leak-free shield-driven pumps are used to minimize leakage risk; models offer low noise and flow/pressure ranges suitable for the selected unit.

Electronic expansion valve
Wide-range dynamic refrigeration control is achieved with an electronic expansion valve (e.g. Emerson) providing precise refrigerant flow control (stepping control, e.g. 0–750 steps/min) for stable refrigeration performance.

Configuration software (optional)

• Optional PC connection via Ethernet/RS232/RS485 to record and display controller screens.
• Communication distance up to ~200 m with appropriate interfaces.
• Software features: easy temperature setting, real-time control view, curve recording, program selection and alarm logs.

Safety protection
Extensive safety and self-diagnostic features: phase-sequence protection, leakage protection, refrigeration high/low pressure and voltage protection, pump overload protection, compressor overload protection, high/low liquid level protection, dual independent over-temperature protections, water protection and circulation line shut protection with alarm/display.

Connecting pipe (examples from documentation)
Items | Temp. range | Interface port
Fluorine rubber hose | -30~200°C | Φ12×16, Φ16×22, Φ20×26
Metal insulated pipe | -60~250°C | DN15, DN20, DN25, M24×1.5, M30×1.5, M38×1.5

Data interface & software (standard)

• PT100 temperature sensor inputs.
• USB data export interface.
• RS485 interface (MODBUS RTU protocol).
• Alarm contact output.

Heat conduction medium
Selection of heat transfer medium is critical for stable operation. LABFREEZ supplies heat transfer fluids in packages (10L, 25L, 30L, 200L). Select medium according to the required working temperature.

Optional features

• 4–20 mA temperature measurement input.
• 4–20 mA temperature setpoint input.
• Ethernet interface.
• RS232 interface (MODBUS protocol).
• PC operating software (requires Ethernet).
• External control box with touch-screen display.

Technical specifications

• Control mode: Feed-forward PID, PLC control.
• Temperature control: Material and circulating liquid temperatures controllable and settable.
• Program: up to 20 programs, 45 segments each.
• Protocol: MODBUS RTU via RS485.
• Temperature sensors: PT100 inputs for circulation medium and process (3 measuring points). 4–20 mA optional.
• Control panel: 7-inch color touch screen with temperature curve display & recording (example).
• Safety: self-diagnosis; compressor/pump overload protection; high/low pressure and temperature protection.
• Closed-loop system: fully closed to avoid oil mist or moisture absorption and automatic replenishment behavior at low temperature.

Key laboratory model examples (excerpt)
Model | Temp. range °C | Temp. accuracy | Heating power
HRHC-625W | -60 ~ 200 | ±1°C | 2500 W
HRHC-635WN / HRHC-635N | -60 ~ 200 | ±1°C | 3500 W
HRHC-655W / HRHC-655 | -60 ~ 200 | ±1°C | 5500 W
HRHC-675W / HRHC-675 | -60 ~ 200 | ±1°C | 7500 W
HRHC-6A10W / HRHC-6A10 | -60 ~ 200 | ±1°C | 10000 W
HRHC-6A15W | -60 ~ 200 | ±1°C | 15000 W

Cooling capacity examples (selected points)
Temperature | HRHC-625W | HRHC-635WN | HRHC-655W | HRHC-675W | HRHC-6A10W | HRHC-6A15W
200°C | 2500 W | 3500 W | 5500 W | 7500 W | 10000 W | 15000 W
100°C | 2500 W | 3500 W | 5500 W | 7500 W | 10000 W | 15000 W
20°C | 2500 W | 3500 W | 5500 W | 7500 W | 10000 W | 15000 W
0°C | 2500 W | 3500 W | 5500 W | 7500 W | 10000 W | 15000 W
-20°C | 2000 W | 3000 W | 4850 W | 6000 W | 8200 W | 12000 W
-40°C | 950 W | 1450 W | 2300 W | 3100 W | 4800 W | 7750 W
-55°C | 250 W | 500 W | 750 W | 900 W | 1500 W | 2800 W

Industry-level examples (excerpt)
Models HRHC-6A25W up to HRHC-6A130W support -60°C ~ +250°C operation with heating powers from 25 kW up to 130 kW and cooling capacities specified per temperature. Compressors and expansion valves reference commercial brands (examples: Copeland compressors, Emerson expansion valves; evaporators: KAORI plate heat exchangers). Connection sizes and dimensions vary by model.

Typical application images / examples
Glass reactors and pilot plant/scale-up systems, jacketed reactors, distillation and vacuum processes, material testing and semiconductor process temperature control.