The Great Wall DLSB-ZC Integrated Vacuum and Low-Temperature Circulating Chiller

Overview

The Great Wall DLSB-ZC Integrated Vacuum and Low-Temperature Circulating Chiller is an engineered dual-function laboratory system designed for applications requiring coordinated thermal control and vacuum environment management within a single platform. It combines a high-efficiency refrigeration circuit—based on vapor-compression thermodynamics—with a multi-head vacuum generation subsystem, enabling simultaneous or independent operation of low-temperature circulation (–10 °C to 25 °C) and deep vacuum (down to 2 kPa absolute). Unlike conventional chillers or standalone vacuum pumps, the DLSB-ZC integrates temperature regulation, fluid circulation, and vacuum draw into one compact, self-contained unit. Its architecture supports closed-loop cooling of external reactors, condensers, or cold traps while concurrently evacuating reaction vessels or drying chambers—making it particularly suitable for rotary evaporation, freeze-drying pre-cooling, vacuum distillation, and low-temperature catalytic synthesis setups where thermal and pressure conditions must be tightly coupled.

Key Features

• Integrated dual-mode operation: Synchronized or decoupled control of refrigeration cycle and vacuum generation via dedicated interface logic.
• Panasonic rotary compressor with high COP (coefficient of performance) and extended service life under continuous duty cycles.
• Triple independent vacuum heads (10 L/min each), allowing staged evacuation, redundancy, or parallel processing of multiple vessels.
• 20 L insulated stainless-steel reservoir with precision-level temperature uniformity (±2 °C stability across full operating range).
• High-flow circulation pump (30 L/min rated, 280 W) with corrosion-resistant wetted parts compatible with water, ethanol/water mixtures, and silicone oils.
• Modular component design: Danfoss dryer filters, Xin’ao air-cooled condensers, and Zhengzhou Great Wall–fabricated evaporators and vacuum chambers ensure traceable quality and field-replaceability.
• Intuitive Haihong microprocessor controller with real-time display of bath temperature, vacuum pressure, pump status, and fault diagnostics.

Sample Compatibility & Compliance

The DLSB-ZC is compatible with standard laboratory glassware including 1–5 L rotary evaporator flasks, jacketed reactors (up to Ø200 mm), and vacuum desiccators. Its temperature range (–10 °C to 25 °C) and vacuum capability (0.098 MPa) align with common requirements in ASTM E2017 (standard practice for vacuum drying), ISO 2954 (vibration monitoring of rotating machinery), and USP guidelines for analytical instrument qualification—particularly for systems used in QC labs performing solvent removal or thermal stability testing. While not certified to IEC 61000-6-3 (EMC) or UL 61010-1 out-of-the-box, its electrical architecture complies with CE-marking essential requirements for laboratory equipment when installed per manufacturer-specified ventilation and grounding protocols. Documentation packages include full BOM traceability, material certifications for wetted components (304 stainless steel, EPDM seals), and factory calibration records for temperature and pressure sensors.

Software & Data Management

The DLSB-ZC operates via embedded firmware without proprietary PC software; however, its Haihong controller supports RS-485 Modbus RTU output for integration into lab-wide SCADA or LIMS environments. Logged parameters—including setpoint vs. actual temperature, vacuum decay rate, compressor run-time, and pump duty cycle—are timestamped and exportable via USB flash drive in CSV format. Audit trails meet GLP/GMP baseline expectations: all parameter changes are logged with user ID (if enabled via optional password lock), date/time stamp, and pre-/post-change values. For regulated environments, optional firmware upgrade enables 21 CFR Part 11–compliant electronic signatures and role-based access control (admin/operator modes), with encrypted local storage retaining ≥30 days of operational history.

Applications

• Rotary evaporation support: Maintains precise coolant supply to condensers while backing vacuum pumps during solvent recovery (e.g., ethanol, acetone, ethyl acetate).
• Low-temperature vacuum drying: Pre-chills trays and controls sublimation kinetics in pilot-scale lyophilization workflows.
• Catalytic reaction cooling: Stabilizes exothermic Grignard or lithiation reactions under reduced pressure with active heat extraction.
• Vacuum jacketed reactor conditioning: Provides circulating coolant to reactor jackets while maintaining process vacuum for moisture-sensitive syntheses.
• Calibration reference systems: Serves as stable thermal/vacuum source for validating vacuum gauges, pressure transducers, and IR thermometers.

FAQ

What is the lowest achievable temperature when operating under vacuum?
The DLSB-ZC maintains its specified –10 °C minimum bath temperature regardless of vacuum state; however, evaporative cooling effects in open-loop external circuits may cause localized sub-zero surface temperatures—this is not controlled or guaranteed by the unit’s feedback loop.
Can the vacuum and cooling functions operate independently?
Yes. The controller allows manual override to run the chiller without vacuum activation, or vice versa—ideal for maintenance or partial-system validation.
Is the reservoir fluid path compatible with glycol-water mixtures?
Yes. The circulation system is rated for aqueous glycol solutions up to 30% v/v; compatibility with higher concentrations requires verification of pump seal material (EPDM standard) against long-term swelling.
What documentation is provided for IQ/OQ validation?
Factory test reports include temperature uniformity mapping (9-point grid), vacuum hold-down tests (≤0.5 kPa/hr drift at 2 kPa), and electrical safety certification per GB 4793.1–2019 (equivalent to IEC 61010-1).
Are spare parts available globally?
Critical spares—including Danfoss filter driers, Panasonic compressor kits, and Haihong controllers—are stocked by authorized regional distributors in North America, EU, and APAC; lead time averages 7–12 business days ex-warehouse.