Refrigerated heating circulator HRHC series

for high temperatures

Application: HRHC series Hermetic Refrigerating & Heating Circulator (Dynamic Temperature Control systems) can be connected to reactor systems, autoclaves, pilot and mini‑plant systems, double‑wall reactors, advanced‑flow reactors, distillation units, material testing rigs, combinatorial chemistry setups, semiconductor equipment and vacuum chambers.

Advantages & Functions:

• Hermetic closed circulation maintains high temperature accuracy and prolongs circulating medium life.
• Wide operating range across product family (examples: down to −100°C and up to +350°C in specific configurations).
• Intelligent feedforward + PID temperature control for minimized lag and overshoot.
• High process stability and reproducibility.
• Plate heat exchanger and optimized heating circuit for improved heat transfer rates.
• Cooling power options from ~0.5 kW to 500 kW depending on model.
• Optional 4", 7" or 10" TFT touch displays.
• Comprehensive alarms and safety functions.
• Rapid cooldown capability from high temperatures in applicable configurations.
• Optional PC/software control and data logging (remote communication up to ~200 m with suitable hardware).
• Compact footprint for demanding laboratory and pilot environments.

Structure design: Fully closed piping with high‑efficiency plate heat exchanger reduces thermal fluid volume while enabling fast temperature ramps. The closed liquid loop includes an expansion vessel mechanically coupled to the circulation so vessel temperature is limited (typically ≤60°C). Advantages:

• Only fluid in the expansion vessel contacts air, reducing volatilization and oxidation risk.
• No significant volatilization of heat transfer medium during normal high‑temperature operation.
• No need to change heat transfer medium across many continuous ranges (examples: −80°C~190°C, −70°C~220°C, −88°C~170°C, −55°C~250°C, −30°C~300°C) without pressure rise.

Display function:

• All process control temperatures visible.
• Liquid level indicator for expansion vessel.
• Refrigeration system status indicator.
• Heater status indicator.
• Circulation pump status indicator.
• Selectable control mode: material vs. heat transfer medium.
• Upper and lower temperature limits configurable.
• Settable temperature offset between jacket and reactor material.
• Low‑liquid alarm.
• Compressor manual/automatic mode selection.
• Clear temperature curve display with zoom and export (optional PC software).
• Recipe/procedure editor and display.
• Alarm log and on‑screen notes.

Principle of process control: Two‑loop control architecture (master/main loop + secondary loop) with feedforward from PV. Master PID output combined with feedforward forms the composite setpoint for the secondary loop, minimizing lag and overshoot and ensuring accurate temperature gradients.

High repeatability / Control accuracy: Feedforward + PID (optionally PLC) plus multi‑point feedback deliver tight control of both heat transfer medium and process material; typical accuracies: medium ±0.5°C, reaction material ±1°C (model dependent).

Circulation pump: High‑temperature resistant magnetic drive or shield‑driven leak‑free pumps reduce leakage risk, provide low noise and high flow capacity suitable for extreme temperature operation.

Electronic expansion valve: EEV (Emerson recommended) with fine step control (0–750 steps/min) for precise refrigerant metering and improved control accuracy.

Configuration software (Optional):

• PC connection via Ethernet/selected interface option.
• Record display screenshots and data to computer.
• Communication distances up to ~200 m with appropriate hardware.
• Easy temperature programming, real‑time control screen and curve records.
• Program selection and alarm recording.

Safety protection: Multiple protections and self‑diagnostics: phase sequence and leakage detection, refrigeration system high/low voltage protection, pump and compressor overload protection, high/low liquid level alarms, at least two independent over‑temperature protections, water protection and circulation line shut protection.

Connecting pipe (summary):

• Fluorine rubber hose: −30°C~200°C, Ø12×16, Ø16×22, Ø20×26.
• Metal insulated pipe: −60°C~250°C, DN15, DN20, DN25, M24×1.5, M30×1.5, M38×1.5.

Data interface & software (standard):

• PT100 sensor inputs.
• USB data export.
• RS485 (MODBUS RTU) interface.
• Alarm relay outputs.

Heat conduction medium: Select medium according to operating range and external circulation needs; LABFREEZ packaged media available in 10 L, 25 L, 30 L and 200 L containers for common ranges.

Optional (examples):

• 4–20 mA temperature input.
• 4–20 mA setpoint input.
• Ethernet and RS232 (MODBUS) options.
• Computer operating software (requires Ethernet option).
• External control box with touch‑screen.

Technical specifications:

• Example medium range (family): −70°C ~ +250°C (other variants available: −100°C to +350°C in special configs).
• Control mode: Feedforward + PID; PLC option and model‑free self‑tuning available.
• Temperature control modes: Independent control of material and circulation liquid.
• Program editor: Multiple program groups (examples: 5 programs × 40 steps; up to 20 groups × 45 segments in some configs).
• Protocol: MODBUS RTU via RS485 (standard).
• External feedback: PT100 (default) or 4–20 mA optional.
• Feedback points: Medium inlet/outlet and reactor material (3‑point feedback supported).
• Control accuracy: medium ≈ ±0.5°C; material ≈ ±1°C (typ.).
• Heating power options (examples): 2.5, 3.5, 5.5, 7.5, 10, 15 kW (model dependent).
• Cooling capacity: model dependent; family examples provided across temperature points.
• Circulating pump: Magnetic drive, high/low temp compatible.
• Compressor: Recommended Tecumseh or Emerson Copeland scroll compressors (model dependent).
• Expansion valve: Danfoss/Emerson TEV and Emerson EEV for high accuracy.
• Evaporator: High‑efficiency plate heat exchangers.
• Operation panel: 7" color touch screen standard; other sizes optional.
• Safety: Self‑diagnosis, overload and thermal protections, high‑pressure switch and multiple built‑in protections.
• Closed circulation: Prevents oil mist at high temp and moisture ingress at low temp; automatic replenishment for low‑temp operation.
• Refrigerant options: Commonly R404A / R23 depending on low‑temperature needs.
• Connections: Typical fittings G1/2, G3/4, G1; thread and flange options per model; air‑cooled and water‑cooled versions available.
• Typical weight/power: Example weights from ~190 kg upward; power consumption varies by model (examples: 5.2, 8, 11, 15, 20, 28 kW).