Fluid handling, regulation and control

Fluid handling, regulation and control

Fluid handling, regulation and control

Model 990.51 Diaphragm seal with sterile connection For Aseptic, Chemical and Pharmaceutical Industry Aseptic connection per DIN 11 864

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Diaphragm seals are used to protect the pressure measuring instrument from aggressive, adhesive, crystallising, corrosive, highly viscous, environmentally hazardous or toxic media. A diaphragm made of the appropriate material provides for the separation from the medium to be measured. Thus even the most difficult measuring requirements can be met by combining measuring instruments with diaphragm seals.

A fluid inside the system, which can be chosen to suit the particular application, hydraulically transmits the pressure to the measuring instrument.

Almost limitless application possibilities exist due to the large number of available variants, such as diaphragm seal designs or materials. The type of process connection (flange, threaded and sterile connection) and the basic method of manufacture are important design differentiation criteria.

For further technical information on diaphragm seals and diaphragm seal systems see IN 00.06 “Application, operating principle, designs”.

The model 990.51 diaphragm seal with aseptic connection per DIN 11864 is ideally suited to fulfil the high standard requirements of sanitary applications. It can be optimally integrated into aseptic processes, fulfils all hygienic design requirements and is EHEDG certified. The diaphragm seal systems can withstand the cleaning vapour temperatures occurring in the SIP processes and thus ensure a sterile connection between the medium to be measured and the diaphragm seal.

Assembly of the diaphragm seal and measuring instrument is made via a direct assembly as standard or optionally via a cooling element or a flexible capillary.

For the material selection WIKA offers a variety of solutions, in which the upper body and the diaphragm are made of identical materials. Stainless steel 316L (1.4435) is used as standard material, other special materials are available on request.

Measuring systems with the model 990.51 WIKA diaphragm seal are successfully used in pharmaceutical, biotechnology, aseptic food production and life science industries.


  • Food and beverage production
  • Pharmaceutical industry, biotechnology industry, production of active ingredients
  • Production of aseptic basic materials in the chemical industry

Special Features

  • Quick cleaning of measuring point, without residue
  • Certified hygienic design
  • Suitable for SIP and CIP
  • EHEDG certified and 3-A compliant
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