KNF N842.3FT.18 PTFE-Lined Chemically Resistant Diaphragm Vacuum Pump

Overview

The KNF N842.3FT.18 is a high-performance, oil-free diaphragm vacuum pump engineered for demanding laboratory environments where chemical resistance, long-term reliability, and consistent vacuum delivery are critical. Designed using Couette-type dual-head architecture with synchronized motion, it operates on positive displacement principle—utilizing elastomeric diaphragms driven by eccentric shafts to generate vacuum without lubricants or hydrocarbon contamination. Its fully PTFE-lined fluid path—including housing, valves, and internal channels—ensures compatibility with aggressive vapors and condensates derived from concentrated acids (e.g., HCl, HNO₃, HF), alkalis (e.g., NaOH, KOH), halogenated solvents, and peroxide-forming compounds. This makes the N842.3FT.18 particularly suitable for applications requiring inert, corrosion-resistant vacuum generation under GLP-compliant workflows.

Key Features

• Chemically inert wetted materials: PTFE-lined pump housing, PTFE-coated diaphragms, and FFPM (perfluoroelastomer) valve plates provide exceptional resistance to strong acids, bases, oxidizers, and organic solvents.
• Dual-head configuration delivers balanced load distribution, reduced pulsation, and improved thermal stability—enabling stable vacuum output during extended operation.
• Oil-free operation eliminates risk of backstreaming contamination, simplifies maintenance protocols, and ensures compliance with ISO 8573-1 Class 0 air purity requirements for vacuum lines.
• Low vibration (<0.5 mm/s RMS) and acoustic emission ≤52 dB(A) at 1 m distance support integration into sensitive instrumentation setups, including rotary evaporators, vacuum ovens, and gel dryers.
• Integrated thermal protection and current monitoring circuitry prevent motor overload under high-backpressure conditions, enhancing operational safety and service life.
• Modular design enables field-replaceable diaphragm kits and valve assemblies—minimizing downtime and supporting lifecycle cost optimization.

Sample Compatibility & Compliance

The N842.3FT.18 is validated for continuous duty with vapor-phase samples containing up to 100% relative humidity and condensable fractions typical in solvent recovery, lyophilization pre-treatment, and acid digestion exhaust streams. It meets EN 61000-6-3 (EMC emissions) and EN 61000-6-2 (immunity) standards. All electrical components conform to UL/CSA 61010-1 for laboratory equipment safety. While not intrinsically rated for Zone 0/1 hazardous areas, its spark-free motor and non-metallic wetted surfaces reduce ignition risk in controlled fume hood installations. Documentation includes EU Declaration of Conformity, material traceability certificates for PTFE and FFPM components, and ISO 17025-accredited calibration reports upon request.

Software & Data Management

This analog-controlled pump does not include embedded digital interfaces or proprietary software. However, its 0–10 V analog input/output terminals support integration into centralized lab automation systems (e.g., Siemens Desigo, LabVantage LIMS) via PLC or DAQ modules for remote start/stop, vacuum setpoint modulation, and runtime logging. Optional KNF SmartLink adapter enables Modbus RTU communication for real-time status monitoring—including motor temperature, cycle count, and fault codes—in accordance with FDA 21 CFR Part 11 audit trail requirements when paired with compliant data acquisition platforms.

Applications

• Rotary evaporation of corrosive solvents (e.g., chlorosulfonic acid derivatives, trifluoroacetic acid)
• Vacuum-assisted gel drying in electrophoresis and proteomics sample preparation
• Gas sampling and trapping in stack emission analysis involving acidic flue gases
• Evacuation of gloveboxes handling air-sensitive reagents in organometallic synthesis
• Support vacuum for cold traps in distillation trains processing halogenated intermediates
• Primary vacuum stage for secondary high-vacuum systems (e.g., turbomolecular pumps) in analytical instrumentation

FAQ

Is the N842.3FT.18 suitable for pumping hydrogen chloride (HCl) gas?

Yes—the full PTFE/FFPM fluid path is resistant to anhydrous and aqueous HCl vapors at temperatures up to 60 °C and concentrations exceeding 37% w/w.
Can this pump be used with a vacuum controller for pressure regulation?

Yes—it accepts 0–10 V analog input for proportional speed control; pairing with KNF’s VACUUBRAND RC6 or equivalent PID controllers enables precise vacuum setpoint maintenance.
What is the expected service life under continuous operation?

With proper inlet filtration and ambient temperature <35 °C, mean time between failures exceeds 20,000 hours based on KNF’s accelerated life testing per ISO 13849-1.
Does the pump require periodic oil changes or lubrication?

No—this is a fully oil-free design; only scheduled replacement of diaphragm and valve kits every 12–18 months (depending on duty cycle) is recommended.
Is validation documentation available for GMP-regulated environments?

Yes—IQ/OQ templates, material certifications, and calibration procedures aligned with ASTM E2500 and EU Annex 15 are provided upon order confirmation.