Refrigerated heating circulator HRHC

for high temperatures

Short description
Hermetic refrigerated heating circulator from the HRHC Series with PLC control and dynamic temperature regulation. Available configurations cover wide temperature windows from -100°C up to +250°C (model dependent). Designed for closed-loop liquid circulation and precise sample temperature control.

Application
Suitable for reactor systems, autoclaves, pilot and mini‑plant systems, scale‑up operations, double‑wall and advanced‑flow reactors, distillation and vacuum systems, material testing, combinatorial chemistry and semiconductor processes.

Advantages & functions

• Hermetic circulation minimizes oxidation and loss of heat transfer medium, improving accuracy and service life.
• Wide working temperature range across selectable models without frequent fluid changes.
• Feed‑forward PID temperature control with PLC for fast, stable response.
• High process stability and reproducibility.
• Plate heat exchanger and optimized heating/cooling piping for improved rates.
• Cooling and heating power scalable by model (approx. 0.5–500 kW depending on configuration).
• Optional TFT touchscreens (4", 7", 10") with graphical user interface.
• Comprehensive alarms and safety functions.
• Rapid cooling capability from high temperatures.
• Optional remote communication and control software.
• Compact footprint relative to delivered capacity.

Structure design
Fully closed piping with a high‑efficiency plate heat exchanger reduces required thermal fluid and accelerates temperature transitions. The closed liquid circulation with an expansion vessel keeps expansion temperature limited and reduces volatilization and oxidation risks of the heat transfer medium. This enables continuous control across broad temperature ranges without pressure rise or frequent medium replacement.

Display function

• Visualization of all process control temperatures.
• Liquid level indication for the expansion vessel.
• Status indication for refrigeration system and heater.
• Status indication for circulation pump.
• Selectable temperature control mode: material vs. heat transfer medium.
• Settable upper/lower temperature limits and allowed jacket-to-material difference.
• Empty‑liquid alarm and refrigeration compressor manual/auto selection.
• Temperature curve display with zoom and export features.
• Recipe programming and alarm note display.

Principle of process control
Dual PID loops (master and secondary) with feed‑forward process variable reduce lag and overshoot. The combined outputs provide accurate gradient control and fast stabilization for temperature‑sensitive processes.

Safety protection
Includes phase sequence protection, leakage detection, high/low pressure protection for refrigeration, pump and compressor overload protection, high/low liquid level protection, dual independent over‑temperature safeguards and circulation line shut protection. Air‑cooled models or units operating below -45°C may include an auxiliary water‑cooled heat exchanger for improved performance at high ambient temperatures.

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 configuration)

• PT100 inputs for temperature sensors.
• USB data export interface.
• RS485 interface (MODBUS RTU protocol).
• Alarm contact outputs.

Technical specifications

• Temperature range options: -10 ~ +200°C; -25 ~ +200°C; -45 ~ +250°C; -60 ~ +250°C; -90 ~ +250°C; -100 ~ +100°C (model dependent).
• Cooling power: typical models from 15 kW up to ~130 kW (model dependent); extended configurations up to ~500 kW available.
• Heating power: similar ranges to cooling (model dependent).
• Control: Feed‑forward PID with PLC control.
• Measured/control points: both circulation medium and material temperatures (PT100 standard; 3 material points).
• Program capability: 20 program groups, up to 45 segments per group.
• Protocols & interfaces: MODBUS RTU / RS485, USB export, alarm contact.
• Control panel: 7" color touch screen standard (other sizes optional) with temperature curve display and recording.
• Safety: multiple built‑in protections (pressure, level, overload, over‑temperature).
• Design: fully closed loop to prevent oil mist and moisture ingress; automatic replenishment for heat transfer medium.
• Series: HRHC Series.