Refrigerated heating circulator HRHC series

for high temperatures

Application: HRHC series hermetic refrigerating & heating circulators are designed for external temperature control of reactors, autoclaves, pilot plants, mini‑plants, double‑jacket reactors, flow reactors, distillation systems, material testing rigs, combinatorial chemistry setups, semiconductor processes and vacuum chambers.

Key advantages & functions

• Hermetic closed‑loop circulation for stable, contamination‑free heat transfer medium and extended fluid life.
• Wide working temperature capability (example variants cover ranges from -100°C up to +350°C depending on model and fluid).
• Feed‑forward dual‑loop PID control for precise material and jacket temperature management.
• High process stability and reproducibility.
• Plate heat exchanger and dedicated heating pipeline for fast heating/cooling response.
• Cooling capacity options from 0.5 kW to 500 kW (model dependent).
• Optional 4", 7" or 10" TFT touchscreens with graphical curve display and export.
• Comprehensive alarms and safety interlocks.

Structure design

• Fully closed liquid circulation with expansion vessel to minimize thermal fluid consumption and volatilization.
• Plate heat exchanger enables rapid temperature shifts without pressure rise.
• Design examples of continuous control ranges: -80°C~190°C, -70°C~220°C, -88°C~170°C, -55°C~250°C, -30°C~300°C (variant dependent).

Display functions

• Visualization of all process temperatures and temperature curves with zoom/export.
• Expansion vessel liquid level and refrigeration/heater/pump status indicators.
• Temperature control mode and selectable material/heat‑transfer medium.
• Upper/lower temperature limits, jacket‑to‑material delta settings and low/empty liquid alarms.
• Ability to set compressor operation manual/auto and recipe/program management.

Principle of process control

• Dual‑loop control: master PID for material and slave PID for jacket/circulation with feed‑forward compensation to reduce lag and overshoot.

High repeatability

• System design and control strategy ensure high measurement repeatability and process reproducibility for scale‑up and routine production runs.

Circulation pump

• High‑temperature magnetic drive or shield‑driven leak‑free pumps available for wide temperature operation, low noise and reduced leak risk.

Electronic expansion valve

• Wide‑range dynamic control using an electronic expansion valve (e.g., Emerson) with fine step regulation to improve refrigerant control accuracy.

Configuration software (optional)

• Computer connection for real‑time display capture, curve recording and recipe management.
• Remote communication up to 200 m; easy setpoint entry and alarm logging.

Safety protection

• Multiple protections: phase sequence, leakage protection, high/low voltage protection for refrigeration, pump/compressor overload, high/low liquid level, dual over‑temperature protections, water protection and circulation line shut detection; alarms shown on touchscreen.

Connecting pipe (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.
• RS485 (MODBUS RTU) interface and alarm contact outputs.

Heat conduction medium

• Choice of stable heat conduction fluids is critical. LABFREEZ heat conduction medium is available in 10L, 25L, 30L and 200L packages for system use.

Optional

• 4–20 mA inputs for measurement and setpoint.
• Ethernet or RS232 (MODBUS) interfaces and computer operating software.
• External control box with touchscreen.

Common specifications

• Control: Feed‑forward PID with PLC.
• Programs: 20 groups × 45 segments.
• Temperature sensors: PT100 for circulation medium and material (3 points); 4–20 mA optional.
• Control panel: Color TFT touch screen (options: 4", 7", 10") with curve display and recording.
• Cooling power: 0.5–500 kW (by model).
• Heat exchanger: Plate heat exchanger.
• Pump: Magnetic drive or shield‑driven leak‑free type.
• Safety: Self‑diagnosis, overload and thermal protections, high‑pressure switch.

Specifications

• Brand: Labfreez Instruments
• Model / Series: HRHC Series
• Service temperature (examples): down to -100°C up to +250°C (variant dependent)
• Control: Dual‑loop PID (feed‑forward), PLC, recipe programs
• Interfaces: PT100, USB export, RS485 (MODBUS); optional Ethernet/RS232/4–20 mA
• Display: Color TFT touch screen (4", 7", 10")
• Circulation pump: Magnetic drive or shield‑driven leak‑free pump
• Cooling capacity: 0.5–500 kW (depending on model)