The Great Wall ZT-50-200-80H Closed-Loop Refrigerated & Heated Circulator

Overview

The Great Wall ZT-50-200-80H is a high-performance closed-loop refrigerated and heated circulator engineered for precise, stable, and dynamic temperature control across demanding laboratory and pilot-scale industrial processes. It integrates three independent thermal subsystems—refrigeration, heating, and pre-cooling—within a single robust chassis, enabling seamless bidirectional thermal management without system reconfiguration. Operating on a fully sealed circulation architecture, the unit maintains inert conditions for heat transfer fluid (HTF), eliminating vapor loss at elevated temperatures and moisture ingress or ambient interference at cryogenic setpoints. This design directly extends HTF service life and ensures long-term calibration integrity. The device employs a high-efficiency brazed plate heat exchanger for rapid thermal exchange, coupled with a magnetically coupled circulation pump delivering up to 30 L/min at 4 bar pressure—guaranteeing zero fluid leakage across the full −80 °C to 200 °C operating range. Its thermodynamic architecture supports both steady-state thermal maintenance and programmed ramp-and-soak profiles, making it suitable for applications requiring strict adherence to time-temperature protocols under GLP, GMP, or ISO 17025 frameworks.

Key Features

• Triple-integrated thermal system: independent refrigeration, heating, and pre-cooling circuits—operable simultaneously or in isolation
• Precision temperature control with ±0.5 °C stability, achieved via adaptive fuzzy-PID algorithm and real-time feedback from dual-sensor monitoring
• Programmable thermal sequencing: up to 120 multi-step programs, each supporting 100 segments with ramp rate, dwell time, and setpoint definition
• 5.7-inch color TFT touchscreen interface with dual-language support (English/Chinese), graphical trend display, and intuitive navigation
• Magnetically driven circulation pump ensuring hermetic sealing—zero leakage risk across entire temperature range
• Comprehensive safety architecture: overtemperature cut-off, dry-run protection, low-fluid-level detection, ground-fault interruption, overcurrent and overload relays, and timed startup delay
• Air-cooled condensation and pre-cooling system—eliminates dependency on external water supply and reduces facility infrastructure requirements
• Real-time bath level monitoring via integrated capacitive sensor with visual and audible alert on screen

Sample Compatibility & Compliance

The ZT-50-200-80H is designed to interface with a broad spectrum of external equipment—including jacketed glass reactors (single-, double-, and triple-layer), stirred tanks, distillation columns, environmental test chambers, vacuum vessels, and semiconductor thermal test platforms. Its closed-loop configuration prevents contamination of process fluids and avoids exposure of heat transfer media to atmospheric oxygen or humidity—critical for oxidation-sensitive silicone oils or low-vapor-pressure synthetic heat transfer fluids. The unit complies with IEC 61000-6-2 (immunity) and IEC 61000-6-4 (emission) standards. Its programmable logic and audit-trail-capable event logging align with foundational requirements for FDA 21 CFR Part 11 readiness when integrated with compliant data acquisition software. While not certified for hazardous area use (e.g., ATEX or IECEx), its electrical design conforms to EN 61010-1 for laboratory equipment safety.

Software & Data Management

The embedded controller supports Modbus RTU communication via RS485 port, enabling integration into centralized SCADA or LIMS environments. Users can export temperature logs (time-stamped, CSV-formatted) directly to USB storage devices. The interface records all operational events—including alarm triggers, mode changes, program starts/stops, and safety interventions—with timestamps and severity codes. Optional PC-based software (sold separately) provides remote monitoring, advanced curve analysis, comparative overlay of multiple runs, and automated report generation compliant with ISO/IEC 17025 documentation requirements. All parameter modifications are logged with user ID (if enabled), date/time stamp, and pre-/post-change values—supporting traceability for quality audits.

Applications

• Temperature control of jacketed reactors in API synthesis, polymerization, and catalytic hydrogenation
• Thermal conditioning of bioreactors and fermentation vessels during kinetic studies and scale-up validation
• Calibration and performance verification of DSC, TGA, and rheometry systems requiring traceable thermal ramps
• Material testing under controlled thermal cycling: thermal shock evaluation, coefficient of thermal expansion (CTE) measurement, and aging simulations
• Process simulation for chemical engineering education and pilot plant commissioning
• Thermal management of optical benches, laser diode mounts, and vacuum chamber walls in R&D settings
• Stabilized temperature environments for precision metrology fixtures and interferometric setups

FAQ

What is the minimum achievable temperature and maximum operating temperature?
The unit achieves a sustained setpoint range from −80 °C to +200 °C, verified per internal calibration protocol using NIST-traceable reference sensors.
Does the system require external cooling water?
No—condensation and pre-cooling are air-cooled; no chilled water or tap water connection is needed.
Can the ZT-50-200-80H be used with flammable heat transfer fluids?
It is rated for use with non-flammable, high-flash-point synthetic heat transfer media only; consult the fluid compatibility chart before operation.
Is remote monitoring supported out of the box?
Yes—RS485 Modbus interface enables third-party SCADA integration; dedicated Ethernet or Wi-Fi modules are optional accessories.
How is temperature uniformity maintained across large external loads?
By maintaining ≥30 L/min flow rate and ≥4 bar pressure head, the system ensures turbulent flow in standard 1–2 inch jacket lines, minimizing axial thermal gradients in reactor jackets.
What certifications does the unit carry?
CE marking per Machinery Directive 2006/42/EC and EMC Directive 2014/30/EU; safety compliance per EN 61010-1:2010.