Filters are used in fluidic systems to protect sensitive components from damage due to contamination and particles. For the safe operation of micro annular gear pumps and their precision-machined rotors, the use of a 10 µm meshed filter is recommended. With compact filter units made out of corrosion-resistant materials, with high filtration performance and different mesh sizes, HNP Mikrosysteme offers suitable filter solutions for all of its pump series.

The filter series F-MI0 is available in two different configurations. The »inlet filter«, without an external housing, is directly immersed in the liquid. The »inline filter« is designed to be installed downstream in the feed line, i.e. directly before the pump. To avoid sedimentation and cross-contamination the filter has a very small dead volume and is manufactured with a smooth surface (Ra 0.8).


  • Corrosion-resistant materials:
    stainless steel 316L or alloy C22 and FPM, FFPM or EPDM
  • Metal filter elements:
    without solder or adhesives
  • High filtration performance and very small size:
    optimized filter element for a low pressure drop even at higher flow rates and viscosities
  • Very compact:
    installation space reduced to a minimum
  • User-friendly and economical:
    filter elements can be cleaned or replaced

Functional principle



Technical data

  • Type
    Inlet filter
    Inline filter (straight)
  • Liquid temperature range
    Inlet filter: -200 … +275 °C [-328 … +527 °F]
    Inline filter: -10 ... +140 °C (-50 ... +150 °C) *
    [+14 … +284 °F (-58 … +302 °F)] *
  • Differential pressure range
    Inlet filter: -
    Inline filter: max. 5 bar [72.5 psi]
  • Operating pressure
    Inlet filter: -
    Inline filter: max. 200 bar [2900 psi] **
  • Seal materials
    Inlet filter: -
    Inline filter: FPM, FFPM, EPDM
  • Materials
    stainless steel 316L; optional: alloy C22
  • Internal volume
    Inlet filter: -
    Inline filter: 0.3 ml [0.02 in³]
  • Dimensions (Ø x H)
    Inlet filter: Ø 6.5 x 21.5 mm [Ø 0.256 x 0.847 in]
    Inline filter: Ø 14 x 34 mm [Ø 0.551 x 1.339 in]
  • Fluid connection
    Inlet filter: slip fitting Ø 2 mm for tubing ID 1/16"
    Inline filter: 1/4" - 28 UNF internal thread
  • Filter fineness
    10 µm
  • Filter area
    1.3 cm² [0.2 in²]
  • Weight
    Inlet filter: 2 g [0.07 oz]
    Inline filter: approx. 32 g [1.13 oz]
  • Remarks
    *depending on seal material
    ** depending on operating temperature
  • Notice
    Even if single parameters are within the indicated performance range of technical data, certain parameter combinations may not be achievable. Single parameters may exceed their indicated performance range under adequate circumstances. For detailed evaluation please contact HNP Mikrosysteme. Actual performance may vary. Specifications are subject to change without notice. 
    This document is subject to change without notice.

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