KNF LABOPORT N840G Diaphragm Vacuum Pump

Overview

The KNF LABOPORT N840G is a compact, oil-free diaphragm vacuum pump engineered for precision and reliability in demanding laboratory environments. Utilizing positive displacement via elastomeric diaphragms actuated by an eccentric cam mechanism, the N840G generates vacuum through sequential expansion and compression of the gas chamber—eliminating lubricants entirely and ensuring contamination-free operation critical for analytical chemistry, solvent evaporation, filtration, and vacuum drying applications. Its ultimate vacuum capability of 6 mbar (abs.) and maximum flow rate of 34 L/min provide sufficient performance for routine vacuum tasks while maintaining low noise emission (<52 dB(A)) and thermal stability under continuous duty. Designed and manufactured in Germany, the N840G adheres to stringent quality control standards aligned with ISO 9001 and conforms to ATEX Directive 2014/34/EU for safe operation in potentially explosive atmospheres (Category 2G, Zone 1).

Key Features

• Chemically resistant construction: PPS (polyphenylsulfone) pump head, PTFE-coated diaphragms, and FFKM (perfluoroelastomer) valves ensure compatibility with aggressive solvents including acetone, chloroform, ethanol, and dilute acids/bases.
• Variable speed control: Integrated manual rotary knob enables real-time adjustment of motor speed (and thus pumping rate), allowing users to optimize vacuum level and flow for sensitive samples or process-specific requirements.
• ATEX-certified design: Approved for use in hazardous areas where flammable vapors may be present—ideal for pharmaceutical R&D, organic synthesis labs, and quality control settings handling volatile compounds.
• Space-efficient footprint: Compact dimensions (177 × 240 × 289 mm) and foldable carrying handle facilitate placement on crowded benchtops or integration into mobile lab carts and fume hood installations.
• Maintenance-free architecture: No oil changes, no valve replacements under normal operation; smooth external surfaces and absence of crevices simplify wipe-down cleaning and support GLP-compliant documentation practices.
• Expandable system interface: Compatible with KNF’s optional protective bottles (e.g., KNF BP 100), condensers (e.g., KNF KF 100), and the VC 900 digital controller for automated pressure regulation and data logging.

Sample Compatibility & Compliance

The N840G is suitable for non-corrosive and mildly corrosive gaseous media within temperature limits of 5–40 °C. It is not intended for pumping condensable vapors above saturation point without auxiliary cold traps or scrubbers. When used with appropriate accessories, it complies with ASTM D86 (distillation), USP (pharmaceutical compounding), and ISO 5801 (fan and blower testing methodology). Its oil-free operation satisfies FDA 21 CFR Part 11 requirements for audit-trail-capable systems when paired with the VC 900 controller and validated software.

Software & Data Management

While the base N840G operates via analog speed control, integration with the KNF VC 900 controller unlocks digital functionality—including programmable ramp profiles, real-time pressure monitoring via integrated sensor inputs, and USB/RS-232 output for CSV export. The VC 900 firmware supports password-protected user levels, electronic signature logging, and time-stamped event records—essential for GMP/GLP-regulated workflows requiring full traceability and instrument qualification (IQ/OQ/PQ).

Applications

• Vacuum filtration of aqueous and organic solutions in analytical sample preparation
• Rotary evaporation support with adjustable suction to prevent bumping during solvent removal
• Gas sampling and solid-phase extraction (SPE) manifold evacuation
• Mass spectrometry inlet line roughing (when paired with secondary high-vacuum pumps)
• Environmental testing chambers requiring stable, clean vacuum environments
• Academic teaching labs where safety, simplicity, and chemical resilience are prioritized

FAQ

Is the N840G suitable for pumping acidic vapors such as HCl or HF?
No. While the PTFE-coated diaphragm and FFKM valves offer broad chemical resistance, hydrofluoric acid (HF) and concentrated hydrochloric acid (HCl) vapors exceed material compatibility limits and may cause rapid degradation.
Can the pump be operated continuously at full speed?
Yes—the N840G is rated for continuous duty at 100% speed under ambient conditions ≤40 °C and relative humidity ≤80%, provided adequate ventilation is maintained around the motor housing.
Does the pump require calibration or periodic verification?
As a mechanical vacuum source without built-in pressure transducers, the N840G does not require formal calibration; however, users should verify ultimate vacuum performance annually using a traceable digital manometer per ISO/IEC 17025 guidelines.
What accessories are recommended for solvent-heavy applications?
A KNF BP 100 protective bottle (with PTFE diaphragm) and KNF KF 100 glass condenser are strongly advised to capture condensables and extend service life in rotary evaporation or distillation setups.
Is the N840G compatible with vacuum controllers from third-party manufacturers?
It supports analog 0–10 VDC or 4–20 mA input signals; however, only KNF-branded controllers (e.g., VC 900) guarantee full feature access, firmware synchronization, and regulatory compliance documentation.