KNF LIQUIPORT Diaphragm Liquid Metering Pump Series NF100 / NF1.100 / NF300 / NF1.300
| Brand | KNF |
|---|---|
| Origin | Switzerland |
| Model Series | NF100, NF1.100, NF300, NF1.300 |
| Flow Rate | 0.2–3.0 L/min |
| Max Suction Height | 3–6 mWg |
| Max Discharge Height | 8–12 mWg |
| Inlet/Outlet Port Size | 8 mm |
| Fluid Temperature Range | 5–80 °C |
| Ambient Temperature Range | 5–40 °C |
| IP Rating | IP65 |
| Power Supply | 100–230 VAC, 50–60 Hz |
| Weight | 1.5 kg |
| Accuracy | ±2% FS |
| Repeatability | ±1% RC |
| Max Fluid Viscosity | 150 cSt |
| Control Interface | Manual knob or 0–10 V analog input |
| Housing/Membrane/Valve Materials | PP/PTFE-coated/FFPM, PVDF/PTFE-coated/FFPM, or PTFE/PTFE-coated/FFPM |
Overview
The KNF LIQUIPORT series represents a class of precision-engineered, maintenance-free diaphragm liquid metering pumps designed specifically for demanding laboratory and analytical applications where chemical compatibility, long-term stability, and precise flow control are critical. Unlike peristaltic or centrifugal alternatives, LIQUIPORT utilizes a mechanically actuated, non-contact diaphragm principle—eliminating fluid contact with moving parts and ensuring zero contamination, no lubricant ingress, and absolute leak-tightness. Each pump is built around KNF’s proprietary dry-running, oil-free diaphragm drive mechanism, enabling reliable operation even under intermittent or dry-run conditions without damage. The modular design allows seamless integration into automated liquid handling systems, sample preparation workflows, reagent dosing modules, and closed-loop cleaning or circulation circuits in analytical instrumentation (e.g., ICP-MS, HPLC auxiliary lines, reactor feed systems). All models comply with IEC 61000-6-2 (immunity) and IEC 61000-6-4 (emission) standards and are CE-marked for use within the European Economic Area.
Key Features
- Chemically inert wetted path options: Three standard material configurations—PP housing with PTFE-coated diaphragm and FFPM valves; PVDF housing with PTFE-coated diaphragm and FFPM valves; or all-PTFE housing, diaphragm, and valve set—ensuring compatibility with aggressive solvents, strong acids (e.g., concentrated HNO₃, HCl), bases, and oxidizing agents.
- Dual-mode operation: Intuitive manual flow adjustment via calibrated rotary knob or precise external analog control (0–10 V DC), enabling synchronization with PLCs, SCADA systems, or lab automation platforms.
- Robust dry-run capability: Engineered to operate safely without liquid present—critical for priming sequences, intermittent dosing, and fail-safe system designs.
- High suction lift performance: Up to 6 mWg (NF1.100/NF1.300 variants), supporting gravity-fed reservoirs or elevated source tanks without auxiliary vacuum assistance.
- IP65-rated enclosure: Dust-tight and protected against low-pressure water jets—suitable for installation in shared lab environments, fume hoods, or near wash-down zones.
- Low power consumption and thermal footprint: Optimized motor design delivers stable flow across voltage fluctuations (100–230 VAC, 50–60 Hz) while maintaining surface temperatures below 45 °C during continuous operation.
Sample Compatibility & Compliance
LIQUIPORT pumps accommodate aqueous solutions, organic solvents (e.g., acetone, THF, acetonitrile), halogenated compounds, and high-purity reagents commonly used in trace elemental analysis, pharmaceutical QC, and environmental testing. The maximum allowable fluid viscosity is 150 cSt at 20 °C—covering most common laboratory liquids including glycerol-water mixtures (≤30% v/v) and diluted polymer solutions. All models meet ISO 8573-1:2010 Class 0 for oil-free air (applied to internal drive chamber), and wetted materials conform to USP Class VI and FDA 21 CFR 177.2470 (for PTFE/PVDF components). While not intrinsically rated for hazardous locations, optional ATEX-compliant versions (e.g., NFxxx-ATEX) are available upon request for classified areas.
Software & Data Management
LIQUIPORT operates as a standalone hardware component with no embedded firmware or onboard data logging. However, its 0–10 V analog interface supports full bidirectional integration with third-party control software—including LabVIEW™, MATLAB® Data Acquisition Toolbox, and industrial HMI platforms—enabling real-time flow rate monitoring, scheduled dosing profiles, and audit-trail-capable event logging when paired with compliant DAQ hardware. For GLP/GMP-regulated environments, integration with validated SCADA systems permits full 21 CFR Part 11 compliance (electronic signatures, audit trails, user access controls) through external configuration—not native pump functionality. No cloud connectivity or proprietary drivers are required.
Applications
- Automated sample introduction in ICP-OES and ICP-MS systems, including internal standard addition and matrix-matched calibration delivery.
- Controlled reagent injection in titration workstations and flow-injection analyzers (FIA).
- Circulation of cleaning solutions in CIP (Clean-in-Place) validation protocols for chromatography manifolds and sensor housings.
- Low-flow, pulseless feeding of catalysts or initiators in small-scale reaction calorimeters and microreactors.
- Continuous dosing of pH adjusters or chelating agents in environmental water quality monitoring stations.
- Transfer of high-purity solvents in semiconductor wafer rinse modules and photolithography support systems.
FAQ
Can LIQUIPORT pumps handle abrasive slurries or particulate-laden fluids?
No. These pumps are designed exclusively for clean, low-viscosity liquids. Suspended solids >50 µm or abrasive particles will accelerate diaphragm and valve wear and void warranty.
Is flow calibration traceable to NIST or other national standards?
Calibration certificates (with uncertainty statements) are available as an optional service at time of order. KNF performs flow verification using gravimetric methods traceable to PTB (Physikalisch-Technische Bundesanstalt) standards.
What is the expected service life under continuous operation?
At rated flow and ambient temperature (23 °C), typical diaphragm life exceeds 10,000 hours. Valve assemblies require inspection every 5,000 hours in aggressive media; replacement kits are field-serviceable without tools.
Do NF1.100 and NF1.300 models offer higher pressure capability than NF100/NF300?
Yes—NF1.100/NF1.300 achieve up to 6 mWg suction and 12 mWg discharge head due to reinforced drive mechanics and optimized valve timing, whereas NF100/NF300 are optimized for lower-head, higher-flow applications.
Are explosion-proof versions available for solvent-handling in confined spaces?
Standard models are not ATEX-certified, but KNF offers factory-modified ATEX Zone 2 variants (e.g., NFxxx-ATEX) with enhanced motor insulation, spark-resistant housings, and certified cable glands—subject to minimum order quantities.
