Refrigerated heating circulator HRHC series

for high temperatures

Short description
HRHC series hermetic refrigerating & heating circulators are closed-loop dynamic temperature control systems designed for integration with reactors, autoclaves and pilot/mini-plant installations, offering continuous control across very wide temperature ranges.

Application
Suitable for reactor systems, autoclaves, pilot plants, mini-plant scale-up, double-wall reactors, advanced-flow reactors, distillation systems, material testing, combinatorial chemistry, semiconductor process baths and vacuum chambers.

Advantages & Functions

• Hermetic circulation minimizes leakage and extends heat-transfer fluid life.
• Wide selectable working temperature ranges (examples across family: down to -100°C up to +350°C design options depending on model).
• Intelligent feed-forward PID temperature control for fast, accurate ramps.
• High process stability and repeatability.
• High-performance plate heat exchanger and optimized heating circuit for improved rates.
• Cooling capacities across the family from approx. 0.5 to 500 kW (model dependent).
• Optional color TFT touch displays (4", 7", 10") with graphical curve view.
• Comprehensive safety and alarm functions.
• Rapid cooling capability from high temperatures.
• Optional remote monitoring and data recording software (communication up to ~200 m with options).
• Compact footprint relative to delivered performance.

Structure design
Fully closed piping with high-efficiency plate heat exchanger reduces fluid inventory while enabling rapid temperature ramps. The closed liquid circulation includes an expansion vessel (container temperature limited in design to ~60°C) and operates adiabatically. Design benefits include:

• Only expansion vessel fluid contacts air, reducing volatilization and oxidation risk.
• No volatilization of heat-transfer medium during normal high-temperature operation.
• No routine fluid change required for continuous control across broad subranges (examples: -80°C~190°C, -70°C~220°C, -88°C~170°C, -55°C~250°C, -30°C~300°C depending on model).

Display function

• Display of all process control temperatures.
• Expansion vessel liquid level indication.
• Status indicators for refrigeration, heater and circulation pump.
• Selectable temperature control modes (material vs. heat-transfer medium).
• Settable upper/lower limits and jacket-to-product differential settings.
• Low/empty liquid alarm.
• Compressor manual/automatic selectable.
• Clear temperature curve display with zoom and export functions.
• Recipe/program management and alarm annotations.

Principle of process control
Dual-loop PID control (master/slave) with feed-forward PV compensation: the master PID combined with feed-forward defines the secondary setpoint to reduce lag and overshoot, enabling accurate dynamic temperature gradients.

High repeatability
System architecture and control strategy ensure high repeatability of temperature control results.

Circulation pump
High-temperature-resistant magnetic drive or sealed shield-driven pumps minimize leakage risk while providing high flow and low noise.

Electronic expansion valve
Electronic expansion valves (e.g., Emerson) provide precise refrigerant flow control with accurate step adjustment of the motorized valve.

Configuration software (Optional)

• PC connection for remote setup and monitoring (optional Ethernet/RS interfaces).
• Real-time screen display and recording of controller data.
• Curve recording and export.
• Program selection and recipe management.
• Alarm recording and playback.
• Communication distance up to approx. 200 m with appropriate options.

Safety protection
Multiple protection and self-diagnosis features: phase-sequence, leakage protection, refrigeration high/low voltage, pump and compressor overload, high/low liquid level, dual independent over-temperature protection, water and circulation-line shut protection.

Connecting pipe (examples)
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 (standard).
• USB data export interface.
• RS485 (MODBUS RTU) and alarm contact outputs.

Heat conduction medium
Selection of an appropriate heat-transfer medium is critical for stable operation. Typical packaging from manufacturer: 10 L, 25 L, 30 L, 200 L. Choose medium based on required working temperature range.

Optional features

• 4–20 mA inputs for measurement or setpoint.
• Ethernet and RS232 (MODBUS) options.
• PC operating software (requires Ethernet option).
• External control box with touch-screen display.

Technical specifications

• Series name: HRHC Series.
• Medium temperature family range (example): -80°C ~ +250°C (specific models cover subranges).
• Control: Feed-forward PID with PLC; model-free self-tree algorithm available.
• Temperature control modes: Material temperature or equipment outlet control, selectable.
• Temperature sensors: PT100 standard; optional 4–20 mA inputs.
• Control accuracy: circulation medium ±0.5°C (typical), reactor material ±1°C (typical), model and conditions dependent.
• Program capacity: multi-program (e.g., 20 groups × up to 45 segments each, model dependent).
• Heating power: model dependent (approx. 3 kW to 80 kW in family examples).
• Cooling capacity: model dependent (examples across family approx. 0.3 kW to 80 kW or higher).
• Compressors: Emerson Copeland scroll or equivalent.
• Expansion valves: Danfoss / Emerson thermal & electronic valves.
• Evaporator/heat exchanger: high-performance plate heat exchangers.
• Operation panel: color touch screen (7" standard; 4"/10" optional) with curve display & recording.
• Protocol: MODBUS RTU over RS-485 standard; Ethernet/RS232 optional.
• Refrigerants: examples R-404A / R508B (model dependent).
• Closed-loop design: fully closed circulation to prevent oil mist/air ingress; automatic replenishment at low temperatures.
• Standard safety: self-diagnostic, compressor/pump overload protection, high/low pressure and temperature switches, alarm outputs.