Jihepu GDSZ-20/-30+200 High-Low Temperature Circulating Chiller

Overview

The Jihepu GDSZ-20/-30+200 High-Low Temperature Circulating Chiller is a dual-mode thermal management system engineered for precise, stable temperature control of external laboratory equipment—including jacketed reactors, calorimeters, distillation units, and analytical instrumentation. It operates on a closed-loop circulation principle, integrating vapor-compression refrigeration and resistive electric heating within a single compact chassis. The unit delivers continuous, bidirectional thermal regulation across a broad operational range (−30 °C to +200 °C), enabling both exothermic reaction quenching and endothermic process initiation without manual intervention or fluid exchange. Its thermodynamic architecture employs a hermetically sealed Panasonic compressor with R22 refrigerant, coupled with a high-efficiency plate heat exchanger and PID-controlled electric heating elements—ensuring rapid thermal response, minimal overshoot, and long-term stability under dynamic load conditions.

Key Features

• Wide operating temperature span (−30 °C to +200 °C) supported by independent refrigeration and heating subsystems
• Precision temperature control with ±0.1 °C accuracy, validated using calibrated PT100 sensing elements
• Robust circulation system: 20–40 L/min adjustable flow rate, 4–6 m head, and 0.4 MPa maximum pressure rating
• Dual-stage safety protection including compressor delay start, overcurrent cutoff, and overtemperature shutdown
• Intuitive LCD interface with tactile keypad navigation and real-time parameter display (setpoint, actual temp, pump status, error codes)
• Corrosion-resistant cold-rolled steel housing with epoxy powder coating for extended service life in lab environments
• Standardized 3/4″ BSP external ports with two 2-meter stainless-steel reinforced silicone hoses included

Sample Compatibility & Compliance

The GDSZ-20/-30+200 is designed for indirect thermal coupling via external circulation loops; it does not contact samples directly. It is compatible with common heat-transfer media such as methyl phenyl silicone oil (flash point >280 °C), meeting ASTM D445 viscosity stability requirements at elevated temperatures. The unit complies with IEC 61000-6-3 (EMC emission standards) and IEC 61000-6-2 (immunity), and its electrical design conforms to GB 4793.1–2007 (equivalent to IEC 61010-1) for laboratory equipment safety. While not certified for hazardous location use, its non-sparking components and sealed refrigerant circuit support operation in general-purpose chemical laboratories under ISO/IEC 17025-accredited quality systems. Routine maintenance intervals align with GLP documentation requirements for temperature-critical processes.

Software & Data Management

This model features embedded firmware with no proprietary software dependency. All operational parameters—including setpoint history, real-time temperature logs, and alarm timestamps—are stored internally for up to 30 days (non-volatile memory). Optional RS485 Modbus RTU output enables integration into centralized SCADA or LIMS platforms for automated audit trail generation, satisfying FDA 21 CFR Part 11 requirements when paired with validated third-party data acquisition software. No cloud connectivity or remote access capabilities are built-in, preserving data sovereignty and simplifying cybersecurity validation for regulated environments.

Applications

• Temperature-programmed synthesis in glass or stainless-steel jacketed reactors (e.g., Grignard, hydrogenation, polymerization)
• Calibration and performance verification of DSC, TGA, and rheometers requiring traceable thermal ramps
• Stabilization of laser sources, photomultiplier tubes, and CCD detectors sensitive to thermal drift
• Controlled cooling/heating cycles in accelerated stability testing per ICH Q1A(R2) guidelines
• Support of cryogenic sample preparation workflows where −30 °C represents the lower operational bound (not liquid nitrogen equivalence)

FAQ

What heat transfer fluids are recommended for operation above 150 °C?

High-purity methyl phenyl silicone oil (e.g., Dow Corning PM-1000 series) is recommended. Avoid mineral oils or glycols due to thermal degradation and vapor pressure limitations.

Can this chiller be used for vacuum jacketed applications?

No—it is rated for positive-pressure external circulation only. Vacuum compatibility requires specialized seal design and pressure-rated pumps not present in this configuration.

Is the R22 refrigerant compliant with current environmental regulations?

R22 is subject to phase-out under the Montreal Protocol. Units manufactured prior to 2020 may contain R22; replacement compressors or retrofit kits using R404A or R507 are available upon request but require engineering review.

Does the unit support external temperature feedback control?

Yes—via optional analog 0–10 V or 4–20 mA input, allowing cascade control using an external process sensor mounted on the target equipment.

What is the expected service life of the compressor under continuous operation?

With proper ambient ventilation (≥500 mm clearance on all sides) and routine condenser coil cleaning, the Panasonic compressor typically achieves ≥25,000 hours MTBF per ISO 13374-2 condition monitoring standards.