KNF SIMDOS FEM1.02 Diaphragm Liquid Transfer Pump

Overview

The KNF SIMDOS FEM1.02 is a precision-engineered, electronically controlled diaphragm liquid transfer pump designed for laboratory and analytical applications requiring chemically resistant, low-flow, high-reliability fluid handling. Unlike peristaltic pumps—which rely on mechanical compression of tubing and introduce wear, pulsation, and calibration drift—the SIMDOS FEM1.02 employs a positive-displacement diaphragm mechanism with non-contact fluid path actuation. This architecture eliminates tubing fatigue, avoids shear-sensitive sample degradation, and ensures long-term volumetric stability without recalibration. Its self-priming capability (up to 2 mWg), dry-run tolerance, and ability to operate under backpressure up to 6 bar make it suitable for pressurized feed systems, closed-loop recirculation, and precise reagent dosing in synthesis, environmental monitoring, and preparative chromatography workflows. The pump complies with IEC 61000-6-2 (immunity) and IEC 61000-6-4 (emission) standards and is constructed to meet the mechanical and chemical durability expectations of ISO/IEC 17025-accredited laboratories.

Key Features

• Chemically inert wetted materials: Multiple configuration options including PP/PTFE-coated diaphragms with FFKM valves, PVDF, pure PTFE, or stainless steel pump heads—enabling safe handling of aggressive solvents (e.g., concentrated acids, halogenated organics, strong bases)
• True zero-maintenance flow control: No tubing replacement, no rotor wear, no lubrication required; flow remains stable over time due to fixed displacement geometry and piezoelectric or stepper-motor-driven diaphragm actuation
• Multi-mode operation: Manual knob adjustment, analog voltage/current input (0–5 V, 0–10 V, 0–20 mA, 4–20 mA), or digital RS232 command interface for integration into automated platforms (e.g., reaction stations, autosamplers, process analyzers)
• IP65-rated enclosure: Dust-tight and protected against low-pressure water jets—suitable for benchtop use in fume hoods, gloveboxes, or humid lab environments
• Continuous-duty design: Certified for 24/7 operation at rated flow; thermally managed motor and heat-dissipating housing prevent thermal derating during extended cycles
• Integrated safety features: Built-in overpressure protection, electronic stall detection, and automatic shutdown upon loss of prime or diaphragm fault

Sample Compatibility & Compliance

The SIMDOS FEM1.02 accommodates liquids with viscosities up to 150 cSt and temperatures between 5 °C and 80 °C. Its compatibility extends across aqueous, organic, and corrosive media—including HNO₃, HF, ClO₄H, CH₂Cl₂, THF, DMF, and molten salts—when configured with appropriate wetted material sets (e.g., PTFE/FFKM for fluorinated acids; SUS/FFKM for oxidizing media). All configurations conform to RoHS Directive 2011/65/EU and REACH Annex XIV restrictions. For regulated environments, the RS232-enabled variants support audit-trail-capable communication protocols compatible with FDA 21 CFR Part 11-compliant software architectures when paired with validated host systems. The pump’s ±1% repeatability and ±2% accuracy (full-scale) satisfy method requirements outlined in ASTM D3427 (liquid transfer precision) and ISO 8503-3 (coating application consistency testing).

Software & Data Management

While the FEM1.02 operates autonomously via front-panel controls, its RS232 interface enables bidirectional communication using ASCII-based command syntax (e.g., “SET FLOW=5.2” or “QUERY STATUS”). Integration with LabVIEW, Python (pySerial), or MATLAB is straightforward via standard serial drivers. Optional KNF RC Plus software provides graphical setup, real-time flow logging, timed dispensing sequences, and CSV export for GLP documentation. All analog and digital control inputs are galvanically isolated to prevent ground loops in multi-instrument setups. Firmware updates are performed via RS232 without hardware modification, ensuring long-term protocol compatibility and cybersecurity maintenance.

Applications

• Precision metering in continuous-flow organic synthesis reactors—replacing dropping funnels or peristaltic pumps where stoichiometric accuracy and corrosion resistance are critical
• Automated sampling and dilution in ICP-MS, IC, and UV-Vis spectrophotometry systems requiring bubble-free, pulseless delivery
• Closed-loop coolant or reagent circulation in electrochemical cells and microreactors
• Low-flow calibration standard generation for gravimetric or conductivity-based flow verification
• Environmental water analysis: acidification, preservative addition, and filtration pre-treatment in EPA Method-compliant sampling trains
• Integration with低压快速制备色谱 (low-pressure flash chromatography) systems for gradient solvent delivery where backpressure tolerance and chemical inertness are mandatory

FAQ

Is the SIMDOS FEM1.02 suitable for pumping viscous silicone oils?

Yes—provided viscosity remains ≤150 cSt and temperature stays within 5–80 °C. Higher viscosities may reduce self-priming efficiency and require pre-wetting.
Can it be used in explosion-proof environments?

No—this model lacks ATEX or IECEx certification. KNF offers intrinsically safe variants (e.g., SIMDOS EX series) for Zone 1/21 applications.
Does flow accuracy depend on backpressure?

Minimal deviation occurs up to 6 bar; built-in pressure compensation maintains ±2% accuracy across the full operating range.
How often does calibration need verification?

None required under normal operation. KNF recommends annual verification against a certified gravimetric standard per ISO/IEC 17025 internal audit protocols.
What is the expected service life under continuous operation?

Rated for ≥20,000 hours at nominal load, with diaphragm lifetime exceeding 10 million cycles when operated within specified chemical and thermal limits.