990.26 Pressure interface with WIKA flange


Šifra: 990.26

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Delivery time: approximately 3-4 weeks

  • pressure range: from 400 mbar (from 5.8 psi); depending on diaphragm diameter
  • flange with welded inner membrane
  • low measuring ranges can be achieved thanks to the internal diaphragm
  • compact design
  • large diaphragm diameter results in lower instrument drift with temperature change



990.26 Pressure interface with flange (diaphragm separator) protects pressure measuring instruments in applications with difficult media. The pressure interface affects the separation of instrument and medium.

The pressure is transmitted to the measuring instrument via a filling fluid system located inside the pressure interface system. A wide range of designs, materials and system fillers are available to meet customer requirements.

The 990.26 is ideal for applications with small process connections. Low measuring ranges can be achieved thanks to the internal diaphragm. The large diameter of the diaphragm results in a smaller variation on the measuring instrument when the temperature changes.

The pressure interface can be attached to the measuring instrument via a direct connection, or at high temperatures via a cooling element or flexible hose.

WIKA offers different solutions for the choice of material, where the top and wet parts of the pressure interface can be made of the same or different materials. Alternatively, the wet parts of the interface may also have a coating.


Fields of application, applications 990.26

  • for aggressive, hot, highly viscous or crystallising media
  • Process industry
  • small process connections for flanges



All functions of the 990.26 can be controlled with the Diaphragm Seal Calculation Software.


Pressure interfaces are used in conjunction with pressure gauges. Read more about pressure interfaces here.