KNF N820.3FT.40.18 Chemically Resistant Self-Drying Diaphragm Vacuum Pump

Overview

The KNF N820.3FT.40.18 is a high-integrity, oil-free diaphragm vacuum pump engineered for demanding laboratory and pilot-scale applications involving aggressive chemical vapors, humid gases, or condensable solvents. Based on KNF’s proven .40-series self-drying architecture, this pump employs a dual-stage diaphragm mechanism with integrated thermal management and vapor-handling design to enable uninterrupted 24/7 operation—even under full-load conditions with high moisture content. Unlike conventional diaphragm pumps susceptible to liquid ingress, membrane swelling, or valve fouling, the N820.3FT.40.18 utilizes chemically inert materials throughout its wetted path—PTFE pump head, PTFE-coated diaphragm, and perfluoroelastomer (FFPM) valves—to ensure long-term stability when exposed to strong acids (e.g., HCl, HNO₃), alkalis (e.g., NaOH, KOH), halogenated solvents, and oxidizing agents. Its self-drying function actively prevents condensate accumulation in the compression chamber by maintaining elevated internal temperatures during operation, thereby eliminating cold-trapping and avoiding automatic thermal shutdown.

Key Features

• Chemically resistant wetted path: PTFE pump housing, PTFE-coated diaphragm, and FFPM valve assemblies certified for compatibility with corrosive and condensable media
• Self-drying technology: Integrated thermal regulation ensures continuous operation without condensate-induced stalling or overheating protection activation
• Oil-free and maintenance-light design: No lubricants required; no risk of oil backstreaming or contamination of vacuum lines or connected apparatus
• Low vibration and acoustic emission: Optimized motor balance and elastomeric mounting reduce mechanical transmission—ideal for sensitive instrumentation (e.g., mass spectrometers, gravimetric analyzers)
• Robust 220 V AC motor with Class F insulation: Rated for continuous duty at ambient temperatures up to 40 °C and relative humidity ≤80% non-condensing
• Compact footprint (312 × 220 × 177 mm) and lightweight (9.6 kg): Facilitates benchtop integration and mobile vacuum station configurations

Sample Compatibility & Compliance

The N820.3FT.40.18 is validated for use with vacuum ovens, freeze dryers, rotary evaporators, gel dryers, and vacuum filtration manifolds handling aqueous, acidic, alkaline, or organic solvent systems. Its material set complies with EU Regulation (EC) No. 1935/2004 for materials intended to come into contact with foodstuffs (where applicable), and meets RoHS 2011/65/EU and REACH SVHC screening requirements. While not intrinsically rated for ATEX Zone 1/2, it may be deployed in general laboratory environments adhering to IEC 61000-6-3 (EMC emission limits) and IEC 61000-6-2 (immunity). For GLP/GMP-regulated workflows, the pump supports traceable operation via external pressure sensors and programmable controllers compliant with FDA 21 CFR Part 11 when integrated into validated vacuum control systems.

Software & Data Management

As a standalone analog pump, the N820.3FT.40.18 does not include embedded digital controls or firmware. However, it is fully compatible with third-party vacuum monitoring and automation platforms—including KNF’s optional VACUU·SELECT controller (sold separately)—which provides real-time pressure logging, runtime tracking, duty-cycle analytics, and alarm-triggered event capture. When paired with calibrated Pirani or capacitance manometers, data streams can be exported in CSV or XML formats for audit trails, trend analysis, and electronic lab notebook (ELN) integration. All operational parameters remain accessible via standard 0–10 V analog output or digital RS-485 Modbus RTU interface.

Applications

• Vacuum drying of hygroscopic or pH-sensitive samples in temperature-controlled ovens
• Rotary evaporation of acid-labile compounds or halogenated solvents under reduced pressure
• Lyophilization support for biological matrices where oil-free vacuum integrity is mandatory
• Gas-phase extraction and degassing of polymer precursors or battery electrolytes
• Replacement of water aspirators in chemistry teaching labs—eliminating wastewater disposal and freezing risks
• Integration into automated sample preparation workstations requiring silent, low-vibration vacuum sources

FAQ

Can the N820.3FT.40.18 handle saturated water vapor continuously?

Yes—the self-drying architecture and PTFE/FFPM material combination allow stable operation with up to 100% RH inlet gas, provided ambient cooling is adequate and condensate is removed upstream if bulk liquid is present.
Is this pump suitable for vacuum distillation of concentrated sulfuric acid?

It is chemically compatible with sulfuric acid vapors at concentrations typical of reduced-pressure distillations (≤98% w/w); however, direct exposure to hot, fuming H₂SO₄ (>300 °C) is not recommended due to thermal limits of FFPM valves.
Does the pump require periodic diaphragm replacement?

Diaphragm service life exceeds 10,000 hours under normal laboratory load; replacement intervals depend on duty cycle, chemical exposure severity, and operating temperature—detailed guidance is provided in KNF’s Maintenance Manual 820.3FT Rev. D.
Can it be mounted vertically or inverted?

Mounting orientation must follow KNF Installation Directive ID-820.3FT: only horizontal orientation with specified venting clearance is approved to ensure proper heat dissipation and self-drying efficacy.
What is the expected lifetime of the motor under continuous operation?

Rated for ≥20,000 hours MTBF at 25 °C ambient and nominal load; derating applies above 35 °C ambient or with frequent start-stop cycling exceeding 12 cycles/hour.