Food and beverage production
Soft drink production
For dairies, dairy products
For cleaning easy to remove
Quick cleaning of measuring point, without
Suitable for cleaning out of place (COP)
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
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
For further technical information on diaphragm seals and
diaphragm seal systems see IN 00.06 "Application, operating principle,
The model 990.18, 990.19, 990.20 and 990.21 diaphragm seals
with threaded connection are particularly suited for use in the food industry.
The process connection enables a hygienic integration into the process. 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
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 WIKA model 990.18, 990.19, 990.20
and 990.21 diaphragm seals are used for pressure measurement in various process
steps, e.g. filtration, separation, pasteurisers and filling systems.