HKM SZKB-6A Diaphragm Vacuum Pump

Overview

The HKM SZKB-6A Diaphragm Vacuum Pump is an oil-free, gas-liquid dual-use laboratory vacuum source engineered for precision filtration and degassing applications in regulated and cleanroom environments. Operating on a positive-displacement principle, it employs a chemically resistant PTFE-coated diaphragm driven by a brushless DC motor to generate vacuum without lubricating oil—eliminating risk of hydrocarbon contamination, oil mist emission, or sample carryover. Its sealed architecture ensures consistent performance across both gaseous and low-viscosity liquid phases, making it suitable for membrane filtration of aqueous samples (e.g., water, beverages, pharmaceutical solutions) and mobile phase degassing in HPLC preparation workflows. Designed to meet the mechanical and hygienic requirements of microbiological testing protocols, the pump supports direct inline operation with stainless-steel multi-filter manifolds—enabling continuous, single-pass filtration without intermediate vacuum receivers.

Key Features

• Oil-free diaphragm mechanism with PTFE-composite valve and diaphragm assembly—ensures zero hydrocarbon contamination and compatibility with aggressive solvents and biological matrices.
• Brushless DC motor (24 V, 3 A input) delivering stable torque output, extended service life (>20,000 h MTBF), electromagnetic interference (EMI) suppression, and silent operation (<52 dB(A) at 1 m).
• Gas-liquid dual-mode capability: rated at 6 L/min free-air displacement and 3 L/min liquid-handling capacity—enabling direct suction of filtrate without vacuum flasks or buffer bottles.
• Corrosion-resistant ABS plastic housing with smooth, non-porous surface—facilitates rapid wipe-down decontamination and complies with ISO 14644-1 Class 5 cleanroom handling requirements.
• No external air filter required: integrated particulate trap and self-cleaning valve geometry minimize maintenance intervals and eliminate consumable filter replacements.
• Compact footprint (240 × 268 × 170 mm) and lightweight design (4.0 kg) support benchtop integration in space-constrained QC labs and portable field deployment.

Sample Compatibility & Compliance

The SZKB-6A is validated for use with aqueous, mildly acidic or basic, and low-alcohol-content solutions—commonly encountered in drinking water analysis (ISO 9308-1), beverage sterility testing, and pharmaceutical parenteral solution filtration per USP . Its dry-running architecture meets DIN EN ISO 8199:2008 specifications for microbiological water quality assessment equipment, particularly when paired with HKM stainless-steel multi-filter systems. The absence of oil vapor and metallic wear particles ensures adherence to GMP Annex 1 environmental control expectations for aseptic processing areas. While not intrinsically rated for explosive atmospheres, its DC-powered design avoids ignition risks associated with AC induction motors in volatile solvent environments.

Software & Data Management

As a standalone analog vacuum source, the SZKB-6A operates without embedded firmware or digital interfaces. It features no data logging, remote control, or audit trail functionality—making it suitable for GLP-compliant manual workflows where instrument qualification follows IQ/OQ protocols per ASTM E2500 and ISO/IEC 17025. For laboratories requiring electronic record retention, integration with external pressure transducers (e.g., calibrated capacitance manometers) and validated data acquisition systems enables traceable vacuum level documentation aligned with FDA 21 CFR Part 11 requirements.

Applications

• Membrane filtration of potable water, wastewater, and food/beverage samples for total coliform and E. coli enumeration (APHA Standard Methods 9222 B/D).
• HPLC mobile phase degassing and solvent filtration prior to column loading—reducing bubble formation and baseline noise.
• Vacuum-assisted drying of heat-sensitive biological samples in lyophilization pre-chamber stages.
• Small-scale vacuum concentration of enzyme assays or immunoassay reagents where organic solvent compatibility is critical.
• Supporting vacuum-driven microfiltration in cell culture media sterilization and bioprocess buffer preparation.

FAQ

Can the SZKB-6A handle viscous or particulate-laden liquids?
No—it is rated only for low-viscosity, particle-free liquids (e.g., water, buffer solutions, dilute ethanol). Suspensions, slurries, or high-sugar syrups will cause diaphragm stalling and premature valve failure.
Is this pump compatible with vacuum ovens or rotary evaporators?
Not recommended: its ultimate vacuum (780 mbar) and flow rate are insufficient for thermal evaporation or deep-vacuum drying applications requiring <100 mbar.
Does the pump require periodic oil changes or lubrication?
None—the diaphragm and valves are permanently sealed and self-lubricating; no scheduled maintenance beyond visual inspection of inlet tubing and diaphragm integrity every 6 months.
Can it be operated continuously for 24/7 duty cycles?
Yes—its brushless motor and thermally stable housing permit unattended operation under ambient temperatures ≤35°C and relative humidity ≤80% non-condensing.
What certifications does the unit carry?
It conforms to CE marking requirements for electromagnetic compatibility (2014/30/EU) and low-voltage safety (2014/35/EU); full RoHS 2011/65/EU compliance documentation is available upon request.