Refrigerated heating circulator HRHC series

for high temperatures

Overview
HRHC series hermetic refrigerating & heating circulators are closed-loop recirculating pump systems designed for precise dynamic temperature control in reactors, autoclaves and pilot plants. They cover wide laboratory/industrial ranges (example: -90°C to +250°C depending on model) and integrate intelligent PID control for reproducible processes.

Application

• Connection to jacketed reactors, autoclaves, pilot and scale‑up systems.
• Suitable for distillation, flow reactors, material testing, combinatorial chemistry, semiconductor processes and vacuum chambers.

Advantages & Functions

• Hermetic circulation minimizes leakage and preserves heat transfer medium life.
• Wide working temperature ranges across model variants (examples: -100°C to +350°C nominal ranges for specific variants).
• Feed‑forward + dual PID control for fast response and minimal overshoot.
• Plate heat exchanger and dedicated heating pipeline to improve heating/cooling rates.
• Cooling capacities from ~0.5 kW up to several tens or hundreds of kW depending on model.
• Control interfaces: 4", 7" or 10" TFT touchscreens available.
• Comprehensive alarms and safety protections; rapid cooling from high temperatures.
• Optional remote-control software with communication up to ~200 m.

Structure / Design

• Fully closed piping with high-efficiency plate heat exchanger to reduce circulating medium volume and enable rapid temperature changes.
• Closed liquid circulation with expansion vessel (expansion container temperature limited to ~60°C) to reduce oxidation and volatility of the medium.
• In many variants no change of heat transfer medium is required for broad continuous control ranges (example ranges: -80°C~190°C, -70°C~220°C, -88°C~170°C, -55°C~250°C, -30°C~300°C depending on model).

Display / Control Functions

• Display of process temperatures and status of refrigeration, heater and circulation pump.
• Expansion vessel liquid level indication and empty‑liquid alarm.
• Selectable control mode (material temperature vs. heat-transfer‑medium control) and upper/lower temperature limits.
• Temperature-difference settings between jacket and reactor material, clear temperature curve display with zoom and export.
• Recipe/program setting, alarm records and compressor manual/automatic selection.

Control Principle
Feed‑forward plus dual PID loop (master/slave) with fast correction and optional PV feed‑forward to improve gradient control and accuracy.

High Repeatability
PLC + PID algorithms combined with robust hardware ensure high repeatability and tight process control.

Circulation Pump
High-temperature magnetic drive or shield-driven pumps (leak-free design) provide high flow rates, low noise and minimal leakage risk.

Electronic Expansion Valve
Electronic expansion valves (examples: Emerson) allow precise refrigerant metering and fine step control for improved regulation.

Configuration Software (optional)

• Computer connection for real‑time display, capture and recording of curves and alarms.
• Program selection, alarm export and data logging; communication distance up to approx. 200 m with proper interface.

Safety Protection
Multiple protections: self‑diagnosis, phase sequence detection, refrigerant leakage protection, high/low voltage protection, pump/compressor overload protection, high/low liquid level, dual independent over‑temperature protections and circulation line shutdown protection.

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

Data Interface & Standard Software

• Standard inputs: PT100 temperature sensors (material and medium).
• USB data export; RS485 interface supporting MODBUS RTU; alarm contact outputs.

Heat Conduction Medium
Selection of an appropriate heat transfer fluid is critical for stable operation. LABFREEZ supplies media in 10L, 25L, 30L and 200L containers; choose medium according to working temperature.

Optional Features

• 4–20 mA measurement and setpoint inputs.
• Ethernet and RS232 (MODBUS) interfaces; computer operating software (requires Ethernet).
• External control box with touch-screen display.

Laboratory / Industry Typical Applications

• Jacket temperature control for chemical synthesis and distillation.
• Material testing and semiconductor processes requiring stable temperature baths.
• Battery and motor thermal cycling and testing of new‑energy components (industrial variants available).

Specifications / Technical Data

• Series / Model family: HRHC Series
• Laboratory temperature range example: -90°C ~ +250°C (model-dependent)
• Temperature control accuracy (heat transfer medium): ±0.5°C (selected models); material temperature accuracy: ±1°C
• Control mode: feed‑forward PID with dual-loop (master/slave) and PLC control
• Program capability: multiple programs (examples: 5 programs × 40 steps or 20 programs × 45 segments depending on configuration)
• Temp. sensors: PT100 standard; optional 4–20 mA inputs
• Display: 7" standard color touch screen; options for 4", 7", 10" TFT
• Heating power examples: ~3 kW to 80 kW (model-dependent)
• Cooling capacity: model‑dependent, from hundreds of W at very low temps to tens of kW at higher temps
• Compressors: Copeland / Emerson (examples)
• Expansion valve: Danfoss; optional Emerson electronic expansion valve
• Evaporator: KAORI or high-efficiency plate heat exchangers
• Refrigerants examples: R‑404A, R508B (model dependent)
• Circulation pump: magnetic drive pumps (example flows: up to 50–110 L/min at ~2–2.5 bar depending on model)
• Connection sizes examples: DN20, M30×1.5 up to DN65 for larger models
• Water-cooled options and electrical supply variants (e.g. AC 380V 50Hz); total power depends on model
• Construction: stainless steel (SUS304) case on many models
• Communication: RS485 (MODBUS RTU); optional Ethernet, RS232; USB data export
• Alarms & outputs: alarm contacts and multiple protective interlocks