Model 990.41
Diaphragm seal with flange connection
Threaded design, large working volume
Applications
For assembly (direct assembly, via a cooling element or a capillary) with measuring instruments for low pressuresand with differential pressure measuring instruments
For aggressive, contaminated or hot media
Chemical process industry, petrochemical industry
Level measurement, filter monitoring
Special Features
Internal diaphragm with large working volume
Special materials available
Low temperature error due to large diaphragm diameter (realisation of low measuring ranges possible)
Wide temperature application range due to large working volume
Integrated flushing connections (optional)
Description
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 990.41 diaphragm seal with flange connection and internal diaphragm is ideally suited for applications with small process connections. Due to the internal diaphragm (large diaphragm diameter) low measuring ranges can be realised. When the temperature changes, the diaphragm counteracts the volume expansion of the system fill fluid, thus ensuring a lower deviation at the measuring instrument.
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, the diaphragm and the lower body can be made of identical or different materials. The diaphragm and the lower body can also be offered coated or covered with foils.
Measuring systems with model 990.41 WIKA diaphragm seals are successfully used worldwide in the chemical process and petrochemical industries with high measuring requirements.
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