ZiQi SHZ-D(III) Dual-Gauge Dual-Port Circulating Water Vacuum Pump

Overview

The ZiQi SHZ-D(III) Dual-Gauge Dual-Port Circulating Water Vacuum Pump is an engineered solution for laboratories requiring stable, low-maintenance vacuum generation in compact benchtop environments. Unlike oil-lubricated rotary vane pumps, this unit operates on the principle of water-ring vacuum generation—where a rotating impeller partially submerges in a recirculating water reservoir to create a sealed cavity that expands and contracts, thereby drawing and exhausting gas. This mechanism ensures inherent oil-free operation, eliminating hydrocarbon contamination risks critical in analytical chemistry, pharmaceutical synthesis, and solvent recovery workflows. Designed specifically for integration with rotary evaporators, vacuum distillation assemblies, and filtration manifolds, the SHZ-D(III) delivers consistent vacuum performance across variable load conditions while maintaining thermal stability through its integrated water-cooling loop. Its ultimate vacuum of 0.098 MPa (equivalent to ~20 mbar absolute) supports standard减压蒸馏 (reduced-pressure distillation) and vacuum-assisted crystallization protocols compliant with ASTM D1078 and ISO 6353-2 methodologies.

Key Features

• Dual independent suction ports with individual vacuum gauges—enabling simultaneous but isolated vacuum control for two apparatuses (e.g., one port for rotary evaporation, another for Büchner funnel filtration)
• Modular pump head construction available in corrosion-resistant Lcr18 alloy or AISI 304 stainless steel—ensuring compatibility with organic solvents, weak acids, and alkaline solutions commonly used in extraction and purification
• Engineering-grade ABS/PC composite housing—impact-resistant, non-conductive, and chemically inert; rated IP20 for indoor laboratory use
• Integrated 15-liter water reservoir with level indicator and overflow protection—minimizes manual refilling and prevents dry-run damage during extended operation
• Low-noise motor (≤55 dB(A) at 1 m) with thermally protected 180 W induction winding—designed for continuous duty cycles up to 8 hours without derating
• Self-priming capability with automatic air purge function—reduces startup time and eliminates need for manual venting before operation

Sample Compatibility & Compliance

The SHZ-D(III) is validated for use with aqueous, alcoholic, and chlorinated solvent systems under ambient temperature conditions (10–35 °C). Its water-ring architecture inherently excludes particulates and vapors from the pumping chamber, making it suitable for applications involving volatile organic compounds (VOCs) where condensate trapping is not required. The pump meets CE safety directives (2014/35/EU Low Voltage Directive and 2014/30/EU EMC Directive) and conforms to IEC 61000-6-3 for conducted emissions. While not certified for Class I Division 1 hazardous locations, its oil-free design aligns with GLP-compliant lab infrastructure requirements where trace hydrocarbon interference must be avoided in mass spectrometry sample preparation or residual solvent analysis per USP .

Software & Data Management

As a standalone analog vacuum source, the SHZ-D(III) does not incorporate digital controllers or data logging interfaces. However, its dual-gauge configuration provides real-time visual feedback essential for manual process validation. Each vacuum gauge is calibrated to ±1.5% FS (full scale) and features a glycerin-damped Bourdon tube mechanism for vibration resistance on shared optical tables or fume hood surfaces. For labs implementing electronic batch records (EBR), vacuum status can be monitored externally via optional pressure transducers (e.g., Honeywell ASDX series) connected to PLC-based environmental monitoring systems compliant with FDA 21 CFR Part 11 audit trail requirements.

Applications

• Rotary evaporation of heat-sensitive compounds (e.g., natural product isolates, polymer precursors) at controlled bath temperatures ≤60 °C
• Vacuum-assisted gravity filtration of fine precipitates (e.g., metal oxides, crystalline APIs) using Hirsch or Buchner funnels
• Short-path distillation setups requiring stable sub-atmospheric pressure (50–100 mbar range) for terpene fractionation
• Desiccator evacuation prior to moisture-sensitive weighing or hygroscopic sample handling
• Support vacuum for cold traps in cryogenic condensation systems used in VOC abatement studies

FAQ

Can the SHZ-D(III) operate continuously for 24 hours?
Yes—provided ambient temperature remains below 35 °C, water reservoir level is maintained above minimum mark, and inlet gas load does not exceed 10 L/min per port for prolonged periods.
Is deionized water required for operation?
Distilled or deionized water is recommended to prevent mineral scaling in the impeller chamber, especially when operating >4 hours/day over extended service intervals.
What maintenance schedule is advised?
Inspect water quality weekly; clean reservoir and impeller every 3 months; replace O-rings annually or after 500 operational hours—no lubrication or bearing replacement is required due to sealed motor design.
Does this pump meet ISO 8573-1 Class 0 air purity standards?
Not applicable—the SHZ-D(III) is a vacuum generator, not a compressed air source; however, its oil-free water-ring mechanism ensures zero hydrocarbon carryover into evacuated vessels.
Can it be used with aggressive solvents like acetone or THF?
Yes—when equipped with Lcr18 or stainless-steel pump body; verify solvent compatibility with engineering plastic housing components (ABS/PC) using manufacturer’s chemical resistance chart prior to deployment.