KNF N840.3FT.40.18 Chemically Resistant Self-Drying Diaphragm Vacuum Pump

Overview

The KNF N840.3FT.40.18 is a high-integrity, oil-free diaphragm vacuum pump engineered for continuous-duty laboratory applications requiring exceptional chemical resistance and operational reliability. Designed using KNF’s proprietary self-drying technology, this pump eliminates condensate accumulation in the pumping chamber—enabling stable performance even when handling humid, solvent-laden, or corrosive vapors. Its fully fluoropolymer-wetted path—including PTFE-coated diaphragms, FFPM (perfluoroelastomer) valves, and a polyphenylene sulfide (PPS) pump head—ensures long-term compatibility with concentrated hydrochloric acid, nitric acid, sodium hydroxide solutions, acetone, THF, and other aggressive media commonly encountered in vacuum drying, rotary evaporation, and reduced-pressure distillation. Unlike conventional diaphragm pumps susceptible to membrane swelling or valve degradation, the N840.3FT.40.18 maintains consistent volumetric efficiency over extended runtimes without thermal shutdown, making it suitable for unattended 24/7 operation in GLP-compliant environments.

Key Features

• Self-drying architecture prevents internal condensation buildup—no need for manual venting or periodic maintenance due to liquid ingress
• Fully chemically inert wetted materials: PTFE-coated diaphragm, FFPM elastomer valves, and PPS housing resist corrosion from strong acids, alkalis, and organic solvents
• Oil-free, pulse-free vacuum generation ensures contamination-free sample integrity—critical for analytical prep, lyophilization, and semiconductor R&D
• Low-vibration, quiet operation (<52 dB(A)) minimizes interference in sensitive instrumentation suites and shared lab spaces
• Integrated thermal management system sustains stable motor temperature under full-load conditions; no automatic thermal cutoff during continuous use
• Modular design supports field-replaceable components—including diaphragm kits and valve assemblies—reducing total cost of ownership and downtime

Sample Compatibility & Compliance

The N840.3FT.40.18 is validated for use with moisture-sensitive and chemically reactive samples across ISO 17025-accredited laboratories. Its material construction conforms to USP for pharmaceutical contact surfaces and meets EN 61000-6-3 (EMC) and EN 61000-6-2 (immunity) standards. When deployed with vacuum ovens (e.g., 30 L capacity), freeze dryers, or rotary evaporators, it complies with GMP-relevant operational parameters outlined in FDA 21 CFR Part 11 for traceable process control—particularly when paired with KNF’s optional analog/digital interface modules for vacuum setpoint regulation and runtime logging.

Software & Data Management

While the base N840.3FT.40.18 operates as a standalone unit, it is compatible with KNF’s optional VarioControl™ digital controller (sold separately), enabling programmable vacuum ramping, pressure hold modes, and real-time monitoring via RS-485 or 0–10 V analog output. Logged operational data—including cumulative runtime, cycle counts, and overtemperature events—can be exported in CSV format for audit-ready documentation aligned with ISO/IEC 17025 clause 7.7 (result reporting) and ALCOA+ data integrity principles. No embedded firmware requires validation; all control logic resides externally per ICH GCP Annex 11 guidance.

Applications

• Vacuum drying of hygroscopic compounds and metal-organic frameworks (MOFs) in inert-atmosphere gloveboxes
• Rotary evaporation of acidic or basic reaction mixtures without pump degradation
• Reduced-pressure distillation of thermally labile natural products (e.g., terpenes, alkaloids)
• Gel drying and solvent removal in polymer synthesis workflows
• Evacuation of vacuum desiccators and low-volume vacuum ovens (up to 30 L chamber volume)
• Replacement for water aspirators and oil-sealed rotary vane pumps where effluent disposal, maintenance frequency, or chemical cross-contamination are concerns

FAQ

Is the N840.3FT.40.18 certified for use in Class I Division 1 hazardous locations?

No—it is not intrinsically safe or explosion-proof certified. For ATEX/IECEx environments, consult KNF’s N840.3FT.40.18-ATEX variant (certified per EN 60079-0 and EN 60079-15).
Can this pump handle saturated vapor from aqueous HCl solutions?

Yes—the self-drying function actively expels condensed moisture between strokes, and FFPM valves resist swelling in HCl concentrations up to 37% w/w at ambient temperatures.
What is the recommended service interval for diaphragm replacement?

Under continuous operation at ≤80% of max flow rate, KNF specifies 10,000 hours or 24 months—whichever occurs first—with no performance drift beyond ±5% flow variation.
Does the pump require an external exhaust condenser?

Not typically—its self-drying capability and PTFE/FFPM chemistry minimize condensate formation. However, for high-boiling-point solvents (e.g., DMF, ethylene glycol), an inline cold trap is advised per ASTM D2879 guidelines.
Is firmware update capability available?

No—this model uses hardwired logic. Digital control and firmware updates are exclusive to VarioControl™-equipped versions (e.g., N840.3FT.40.18-VC).