Tongzhou Weipu N18s Compact Water-Cooled Circulating Chiller
| Brand | Tongzhou Weipu |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Direct Manufacturer |
| Instrument Type | Integrated Unit |
| Cooling Method | Water-Cooled |
| Temperature Control Range | 5–40 °C |
| Refrigeration Capacity | 18,000 W |
| Temperature Stability | ±0.2 °C |
| Circulating Pump Pressure | 3.6 bar |
| Circulating Pump Flow Rate | 110 L/min |
| Reservoir Volume | 33 L |
| Operating Principle | Vapor-Compression Phase-Change Cycle |
Overview
The Tongzhou Weipu N18s is an integrated water-cooled circulating chiller engineered for stable, continuous thermal management of laboratory instrumentation requiring precise coolant delivery. It operates on a vapor-compression refrigeration cycle—utilizing a hermetically sealed compressor, condenser, expansion device, and evaporator—to achieve efficient heat transfer from process fluid to external cooling water. Designed specifically for mid-range thermal loads, the N18s delivers 18 kW of refrigeration capacity while maintaining temperature setpoints within ±0.2 °C across its operational range of 5–40 °C. Its water-cooled architecture eliminates reliance on ambient air, making it suitable for enclosed labs or high-heat environments where air-cooled units would suffer reduced efficiency or require excessive ventilation infrastructure. The unit integrates a 33-liter stainless-steel reservoir, a high-head circulation pump (3.6 bar max pressure), and a flow rate of 110 L/min—enabling compatibility with multiple instruments in parallel or high-flow applications such as laser cooling, ICP-OES/MS torch interfaces, or vacuum pump jacketing.
Key Features
- Integrated all-in-one design minimizes footprint and simplifies installation—no separate condenser or remote cooling tower required beyond standard facility water supply.
- Stainless-steel reservoir with level sensor and low-level shutdown protection ensures long-term corrosion resistance and operational safety.
- Dual-stage temperature control algorithm combines PID regulation with adaptive feedforward compensation to suppress overshoot during rapid load changes.
- Intelligent pump control maintains constant flow under variable backpressure conditions—critical for consistent thermal performance across complex manifolded systems.
- Industrial-grade scroll compressor with oil management system optimized for extended duty cycles and reduced maintenance intervals.
- Front-panel LCD interface with real-time display of setpoint, actual bath temperature, flow rate, compressor status, and fault codes; supports both Celsius and Fahrenheit units.
Sample Compatibility & Compliance
The N18s is compatible with standard aqueous coolant mixtures (e.g., deionized water, 20–30% ethylene glycol/water) and supports pH-neutral fluids compatible with copper, stainless steel, and EPDM wetted components. It meets CE marking requirements for electromagnetic compatibility (EN 61326-1) and low-voltage directive (EN 61000-6-2/6-4). While not certified to UL 61010-1 or CSA C22.2 No. 61010-1 out-of-the-box, the unit can be configured for North American electrical systems (208–240 V, 50/60 Hz, three-phase) upon request. Its temperature stability and repeatability support compliance with method-specific requirements in ISO/IEC 17025-accredited laboratories, particularly where thermal drift must be documented per instrument qualification protocols (IQ/OQ/PQ).
Software & Data Management
The N18s includes RS485 Modbus RTU communication as standard, enabling integration into centralized lab monitoring systems (e.g., LabVantage, Siemens Desigo, or custom SCADA platforms). Optional Ethernet module (TCP/IP + Modbus TCP) supports remote parameter adjustment, real-time data logging, and alarm forwarding via SMTP or SNMP traps. All temperature and operational logs are timestamped and stored locally for ≥30 days; exportable via USB flash drive in CSV format. Audit trail functionality—including user login history, setpoint modifications, and emergency stop events—can be enabled to meet GLP and FDA 21 CFR Part 11 requirements when deployed in regulated QC/QA environments.
Applications
- Cooling of analytical instruments including ICP-OES, ICP-MS, HPLC column ovens, and FTIR spectrometers requiring stable thermal environments.
- Thermal stabilization of high-power lasers (e.g., CO₂, Nd:YAG, fiber lasers) used in materials processing or spectroscopy.
- Supporting rotary evaporation systems by maintaining consistent condenser temperatures independent of ambient fluctuations.
- Providing secondary cooling loops for cryostats, superconducting magnet chillers, or environmental test chambers.
- Process cooling in pilot-scale bioreactors, chromatography skids, or solvent recovery units where precise thermal control impacts yield or purity.
FAQ
What is the maximum allowable inlet water temperature for the condenser?
The recommended maximum cooling water inlet temperature is 32 °C at 3 bar pressure; operation above this threshold may reduce refrigeration capacity and trigger high-head protection shutdown.
Can the N18s be operated in a closed-loop configuration without external water supply?
No—the N18s is strictly water-cooled and requires a continuous source of facility cooling water; it does not support dry-running or air-cooled retrofitting.
Is the reservoir equipped with a filtration system?
Yes—a 50 µm inline particulate filter is installed upstream of the pump to prevent debris ingress; filter elements are user-replaceable without tools.
Does the unit support external temperature feedback control?
Yes—via optional PT100 input terminal, enabling process temperature feedback from an external sensor mounted at the instrument’s coolant outlet.
What safety certifications does the N18s carry?
It complies with CE directives for EMC and LVD; RoHS 2011/65/EU compliance is documented in the technical file available upon request.
