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You should know pressure gauge

You should know pressure gauge

Oct 13,2017



For aggressive, hot corrosive,environmentally hazardous or toxic media

Process industry


Special features


Process connection with thread to providefor direct treaded connection

Version with internal diaphragm, diaphragmseal parts screwed together

Large selection of process connections andmaterials




Diaphragm seals are used to protect thepressure measuring instrument from aggressive,adhesive,

Crystallizing , corrosive,environmentallyhazardous or toxic media. A diaphragm made of the appropriate material providesfor the separation from the medium to be measured. Thus even the most difficultmeasuring requirement can ba met by combining measuring instruments with diaphragmseals.

A fluid inside the  system ,which can be chosen to the largenumber of available variants, such as diaphragm seal designs or materials. Thetype of process connection(flange,threaded and sterile connection)and the basicmethod of manufacture are important design differentiation criteria.

For further technical information ondiaphragm seals and diaphragm seal systems see IN00.06” Application, operating principle,designs,”

Due to its design, the model990.10diaphragm seal with threaded connection can be used universally. Areplacement of the lower body is possible (e.g.when changing the processconnection )without having to carry out modifications on the diaphragm sealsystem. Compared to the model 990.40 diaphragm seal,higher pressure ranges canbe covered (smaller diameter of the diaphragm).

Assembly of the diaphragm seal andmeasuring insuring instrument is made via a direct assembly as standard or optionally via a cooling element or aflexible capillary.

For the material selection WIKA offers avariety of solutions, in which the upper body, the diaphragm and the lower bodycan be made of identical or different material. The diaphragm and the lowerbody can also be offered coated or covered with foils.

The model 990.10WIKA diaphragm seal is particularlywell suited for aggressive or hot media. This instrument is mainly geared toapplications in the process industry.

 Standard version

Nomina pressure

PN 100 or 250

Pressure ranges

Max .0...250bar(max .0...100bar for lowerbody with tantalus lining or PTFE ) 

Material of upper body

Stainless steel 1.4404(316L)

Material of weeted parts

Diaphragm Stainless steel 1.4435(316L)

Lower body:Stainless steel 1.4404(316L)

Lower body(precess connection)

Tread connection G1/2made


PTFE up to 260C

Retainer parts

Retainer flange (Stainless steel1.4301),hexagon bots and nuts:

Stainless steel ,up to 260C

Level of cleanliness of weeted parts

Oil and grease free per ASTM G93-03levelE(WIKA standard) and ISO 19001

Connection to the measuring instrument