Great Wall DLSB-ZC Low-Temperature Vacuum Pump with Integrated Chiller

Overview

The Great Wall DLSB-ZC Low-Temperature Vacuum Pump with Integrated Chiller is an engineered solution for laboratories requiring simultaneous vacuum generation and active cooling—specifically designed to support rotary evaporation systems under controlled thermal conditions. Unlike conventional water aspirators or standalone diaphragm vacuum pumps, the DLSB-ZC integrates a closed-loop refrigerated circulation system with a multi-port vacuum generation unit. Its operational principle combines vapor-phase pressure reduction via a corrosion-resistant stainless-steel ejector-based vacuum circuit and precise temperature regulation through a self-contained refrigeration loop capable of maintaining coolant at approximately 4 °C. This dual-function architecture eliminates the need for external chillers or tap-water cooling, reducing condenser thermal load and enhancing solvent recovery efficiency during distillation. The unit operates within a defined ambient envelope (5–25 °C), ensuring stable vacuum performance even in variable laboratory environments.

Key Features

• Integrated refrigeration and vacuum generation in a single compact chassis, minimizing footprint and interconnect complexity.
• Triple independent vacuum ports with dedicated analog vacuum gauges (0–0.1 MPa range), enabling real-time monitoring of negative pressure across up to three concurrent applications.
• Stainless-steel evaporator core resistant to organic solvents, acids, and alkalis—ensuring long-term durability in QC, synthetic chemistry, and natural product isolation workflows.
• Self-regulating chiller loop with ±2 °C temperature stability, maintaining coolant at ~4 °C to optimize condenser duty and prevent pump overheating under sustained vacuum load.
• High-capacity 20 L reservoir and 30 L/min circulation flow rate, supporting large-scale rotary evaporators (e.g., 5–20 L flasks) without flow restriction or thermal lag.
• Refrigeration capacity dynamically adjustable from 600 W to 2550 W, matching thermal demand to process scale and solvent volatility.

Sample Compatibility & Compliance

The DLSB-ZC is compatible with standard ground-glass jointed rotary evaporators (e.g., IKA RV 10, Buchi R-300, Yamato AVS series) and supports common laboratory solvents including acetone, ethanol, ethyl acetate, dichloromethane, and toluene. Its stainless-steel wetted surfaces comply with general chemical resistance requirements per ASTM G154 (accelerated weathering) and ISO 15203 (corrosion testing of stainless steels). While not certified to UL/CSA or CE for medical device use, the unit meets basic electrical safety standards for Class I laboratory equipment (IEC 61010-1) and incorporates overtemperature cutoff, dry-run protection, and pressure-relief valves. It is suitable for GLP-compliant environments when operated within documented SOPs; however, it does not include FDA 21 CFR Part 11–compliant audit trails or electronic signature capability.

Software & Data Management

The DLSB-ZC operates as a stand-alone analog instrument with no embedded microprocessor, touchscreen interface, or digital communication ports (e.g., RS-232, USB, or Ethernet). All control and monitoring are performed manually via front-panel mechanical thermostats, on/off switches, and analog vacuum gauges. This design prioritizes reliability, electromagnetic immunity, and ease of maintenance over data logging or remote supervision. Users intending to integrate the unit into automated workflows must pair it with external data acquisition systems (e.g., LabVIEW-compatible thermocouple modules or vacuum transducers with 4–20 mA output) and implement custom calibration protocols. No proprietary software, firmware updates, or cloud connectivity are provided or supported.

Applications

• Rotary evaporation of heat-sensitive compounds (e.g., terpenes, alkaloids, polymers) where low condenser temperature improves yield and prevents decomposition.
• Multi-station parallel distillation setups—three independent vacuum ports allow simultaneous operation of multiple rotovaps or vacuum drying chambers.
• Short-path distillation and fractional crystallization requiring stable sub-ambient condensation temperatures.
• Removal of low-boiling solvents from reaction mixtures prior to NMR or HPLC analysis, minimizing residual solvent artifacts.
• Supporting vacuum filtration systems where consistent negative pressure and cold filtrate collection are critical (e.g., precipitate isolation from aqueous-organic biphasic mixtures).

FAQ

Can the DLSB-ZC be used with non-rotary evaporation applications?
Yes—it is routinely deployed in vacuum drying ovens, cold traps for Schlenk lines, and vacuum-assisted degassing of resins or coatings.
Does the unit require regular refrigerant servicing?
No—the sealed refrigeration circuit is factory-charged and maintenance-free under normal operating conditions; only routine inspection of coolant level and filter cleanliness is recommended.
Is the vacuum performance affected by ambient temperature?
Yes—optimal vacuum stability (≤2 kPa) is achieved only within the specified ambient range of 5–25 °C; operation above 25 °C may reduce refrigeration efficiency and elevate ultimate pressure.
What is the expected service life under continuous operation?
With proper ventilation and periodic descaling of the reservoir (using 5% citric acid solution every 6 months), the unit demonstrates >8 years of reliable service in academic and industrial QC labs.
Are replacement parts such as vacuum gauges or circulation pumps available?
Yes—Great Wall supplies OEM-certified spare parts including stainless-steel vacuum manifolds, silicone tubing kits, and calibrated analog gauges through authorized distributors.