KNF N680.15 Diaphragm Vacuum Pump

Overview

The KNF N680.15 is a compact, high-performance diaphragm vacuum pump engineered for continuous, oil-free operation in demanding laboratory and light industrial environments. Based on KNF’s proven dual-head diaphragm architecture, it operates via positive displacement—using reciprocating PTFE-coated or EPDM diaphragms to alternately expand and compress the gas chamber—enabling reliable evacuation, compression, and transfer of gases and vapors without lubricant contamination. Unlike rotary vane or piston pumps, the N680.15 eliminates oil carryover, particulate generation, and hydrocarbon outgassing, making it suitable for applications requiring clean, chemically inert gas handling. Its ultimate vacuum capability of 160 mbar (abs.) and maximum flow rate of 140 L/min support rapid system evacuation in filtration, degassing, and vacuum drying workflows, while its pressure rating up to 12 bar (rel.) permits dual-use as both vacuum source and low-pressure compressor.

Key Features

• True oil-free operation ensures zero risk of sample or process contamination—critical for analytical instrumentation interfacing (e.g., GC sample introduction, mass spectrometry inlet systems)
• Corrosion-resistant construction: stainless steel pump head and valve plates, combined with chemically resistant diaphragm options (PTFE-coated for halogenated solvents; EPDM for polar organics and aqueous streams)
• Low-vibration, brushless AC motor with thermal protection and integrated speed stabilization—designed for 24/7 duty cycles in temperature-controlled labs
• Compact footprint (235 × 120 × 210 mm) and lightweight design (2.1 kg) facilitate integration into OEM instruments, portable analyzers, and benchtop vacuum manifolds
• Modular configuration options include custom voltage variants (100–240 VAC, 50/60 Hz), analog/digital control interfaces (0–10 V, 4–20 mA, RS-485), and optional integrated pressure sensors with real-time feedback
• Compliant with IEC 61000-6-3 (EMC emission) and IEC 61000-6-2 (immunity), meeting essential requirements for CE marking under the EU Machinery Directive 2006/42/EC

Sample Compatibility & Compliance

The N680.15 is validated for use with non-explosive, non-condensable, and mildly aggressive gases—including nitrogen, argon, air, CO₂, and solvent vapors such as acetone, methanol, and dichloromethane—provided vapor concentrations remain below saturation limits at operating temperature. It is not rated for explosive atmospheres (ATEX), high-humidity saturated streams (>90% RH), or abrasive particulates. All standard configurations meet ISO 8573-1 Class 0 air purity certification for oil-free compressed air, supporting GLP-compliant documentation protocols. For regulated environments (e.g., pharmaceutical QC labs), optional firmware enables audit-trail logging of runtime hours, thermal events, and motor load profiles—aligning with FDA 21 CFR Part 11 data integrity expectations when paired with validated host software.

Software & Data Management

While the base N680.15 operates as a standalone analog device, KNF provides the N-Series Configuration Tool—a Windows-based utility enabling parameter calibration, firmware updates, and operational mode selection (e.g., constant flow vs. pressure-regulated). When equipped with digital interface modules, the pump integrates seamlessly into LabVIEW, Python (via PySerial), or Modbus TCP SCADA systems. Real-time telemetry includes instantaneous flow estimation (derived from motor current and back-EMF analysis), temperature monitoring at stator and diaphragm housing, and predictive maintenance alerts triggered by deviation from baseline vibration spectra—supporting proactive service scheduling per ISO 13374 Condition Monitoring standards.

Applications

• Vacuum-assisted filtration in environmental water testing (EPA Method 1664, ASTM D5907)
• Gas sampling and pre-concentration for ambient air monitoring (VOCs, SO₂, NOₓ) using sorbent tubes and thermal desorption units
• Evacuation of glove boxes and inert-atmosphere reactors during catalyst synthesis and battery material R&D
• OEM integration into automated liquid handlers, dissolution testers (USP ), and residual solvent analyzers
• Continuous purge-and-trap systems for trace-level odorant detection in food safety and fragrance development

FAQ

Is the N680.15 certified for use in explosion-proof environments?

No. The N680.15 is not ATEX- or IECEx-certified. For hazardous area applications, consult KNF’s Ex-series diaphragm pumps with intrinsic safety barriers.
Can this pump handle condensable vapors such as water or ethanol?

Limited tolerance only. Continuous exposure to saturated vapor may cause diaphragm swelling or valve adhesion. Use with cold traps or inline condensers is strongly recommended.
What maintenance intervals are specified for routine operation?

Diaphragms and valves are rated for ≥10,000 hours MTBF under clean, dry gas conditions. KNF recommends visual inspection every 6 months and replacement of wear parts per usage log—not calendar time.
Does KNF provide validation documentation for GMP-regulated installations?

Yes. Upon request, KNF supplies Factory Acceptance Test (FAT) reports, material traceability certificates (EN 10204 3.1), and IQ/OQ templates compatible with Annex 11 and EU GMP Annex 15 frameworks.
How does the N680.15 compare to the older N620 series in terms of thermal management?

The N680.15 features an optimized heat sink geometry and thermally decoupled motor mount, reducing surface temperature rise by ~12°C at full load versus the N620—improving long-term seal integrity and adjacent instrument stability.