990.51 Diaphragm Seal with Sterile Connection


  • Sanitary applications
  • 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, without residue
  • Suitable for SIP and CIP
  • EHEDG certified and 3-A compliant
  • Certified hygienic design


Application Datasheet – Fill Out and Return for Most Accurate Quote


Diaphragm seals are used for the protection of pressure measuring instruments in applications with difficult media. The diaphragm of the diaphragm seal effects the separation of the instrument and the medium.
The pressure is transmitted to the measuring instrument via the system fill fluid which is inside the diaphragm seal system.

There is a wide variety of designs, materials, and system fill fluids available for demanding applications.

Aseptic connections meet a very high hygienic standard. The dead-space-free-sealing is ensured through a metallic stop and self-centring.

The connection is maintenance-free and does not need to be checked even with changing medium temperatures. The diaphragm seal systems can withstand the cleaning vapour temperatures occurring in the SIP processes. Thus ensuring a sterile connection between the medium to be measured and the diaphragm seal.

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

The upper body and the diaphragm are made of identical materials. Stainless steel 1.4435 (316L) is used as standard material. Other special materials are available on request.