Zhengzhou Great Wall DLSB-ZC Low-Temperature Vacuum Pump

Overview

The Zhengzhou Great Wall DLSB-ZC Low-Temperature Vacuum Pump is an integrated laboratory utility device engineered for simultaneous vacuum generation and active cooling—designed specifically to support rotary evaporation workflows under controlled thermal conditions. Unlike conventional water aspirators or standalone diaphragm vacuum pumps, the DLSB-ZC incorporates a closed-loop refrigerated circulation system that maintains coolant temperature at approximately 4 °C, thereby stabilizing vapor pressure of volatile solvents during distillation and enhancing condensation efficiency in rotary evaporator condensers. Its dual-function architecture combines principles of vapor compression refrigeration with positive-displacement vacuum aspiration, enabling precise coordination between vacuum level and coolant temperature—critical for heat-sensitive compound isolation, low-boiling-point solvent recovery, and reproducible batch processing in synthetic chemistry, natural product extraction, and pharmaceutical R&D laboratories.

Key Features

• Integrated refrigerated vacuum system: Combines a high-efficiency compressor-based chiller (−10 °C to +25 °C operating range) with a robust three-port vacuum manifold.
• Triple independent vacuum outlets: Each port delivers a nominal evacuation rate of 10 L/min at ultimate vacuum ≤2 kPa (0.098 MPa), supporting concurrent operation of multiple rotary evaporators or auxiliary vacuum-driven apparatuses.
• Dual monitoring interface: Three calibrated vacuum gauges provide real-time, direct-read negative pressure verification per port; digital temperature display ensures continuous oversight of reservoir coolant stability (±2 °C).
• Corrosion-resistant construction: Stainless steel evaporator core and sealed refrigerant circuit minimize degradation from organic solvent vapors and aqueous condensates.
• High-capacity thermal management: 20 L insulated reservoir with 600–2550 W variable refrigeration output enables stable coolant delivery across extended operational cycles—even under variable ambient loads (5–25 °C).
• Energy-optimized design: Total system power draw of 1650 W includes dedicated 280 W circulation pump (30 L/min flow) and compressor subsystem, compliant with IEC 61000-3-2 harmonic emission standards.

Sample Compatibility & Compliance

The DLSB-ZC is compatible with standard ground-glass jointed rotary evaporators (e.g., 24/29, 29/32 taper interfaces), cold traps, vacuum desiccators, and short-path distillation assemblies. Its stainless steel evaporator surface resists corrosion from common solvents including acetone, dichloromethane, ethyl acetate, methanol, and aqueous acidic/basic solutions. While not certified to ISO/IEC 17025 or FDA 21 CFR Part 11 as a standalone analytical instrument, the unit supports GLP-compliant workflows when integrated into validated evaporation systems—particularly where temperature-stabilized vacuum control contributes to documented process consistency per ASTM E2656 (Standard Guide for Laboratory Evaporation Procedures) and USP (Vacuum Drying).

Software & Data Management

The DLSB-ZC operates via analog controls with digital LED displays for temperature and vacuum—no embedded microprocessor or data logging capability. However, its stable thermal-vacuum coupling makes it suitable for integration into externally monitored systems: analog 0–10 V or 4–20 mA output signals (optional add-on module) can feed temperature and vacuum readings into SCADA platforms or LIMS environments. For audit-trail compliance in regulated labs, users may pair the unit with third-party environmental loggers (e.g., compliant with ISO 17025 traceability requirements) to record time-stamped coolant temperature and manifold pressure profiles alongside evaporation batch records.

Applications

• Rotary evaporation of thermolabile compounds requiring sub-ambient condenser temperatures to prevent decomposition or foaming.
• High-yield solvent recovery from reaction mixtures containing low-boiling fractions (e.g., pentane, diethyl ether, THF).
• Parallel sample concentration across multi-position evaporation stations using the triple-port configuration.
• Vacuum-assisted crystallization and cold filtration setups where consistent sub-ambient bath temperature improves crystal morphology and yield.
• Preparative chromatography fraction collection under reduced pressure with integrated cooling to suppress solvent evaporation in receiving flasks.

FAQ

Can the DLSB-ZC be used with non-Great Wall rotary evaporators?
Yes—the unit features standard G1/4″ BSP vacuum fittings and a 20 L open reservoir compatible with all major rotary evaporator brands utilizing external coolant loops and vacuum manifolds.
What maintenance intervals are recommended for long-term reliability?
Compressor oil inspection every 12 months; refrigerant charge verification every 24 months by authorized service technician; periodic cleaning of stainless steel evaporator fins with deionized water to prevent mineral buildup.
Is the vacuum level adjustable per port?
No—each port operates at the same system-wide vacuum level determined by the internal pump head and throttle valve setting; individual port flow is balanced via manual needle valves (not included but compatible with standard lab vacuum regulators).
Does the unit meet CE or UL safety certification?
The DLSB-ZC complies with GB 4793.1–2019 (Chinese equivalent to IEC 61010-1) for laboratory electrical equipment safety; CE marking is available upon request for export configurations meeting EU Machinery Directive 2006/42/EC requirements.
How does ambient temperature affect ultimate vacuum performance?
Ambient temperatures above 25 °C reduce refrigeration efficiency and may elevate ultimate vacuum to ≥3 kPa; operation within the specified 5–25 °C ambient range ensures rated 2 kPa performance and ±2 °C coolant stability.