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Process connection: female thread or male thread or flange to DIN 2 501 or flange to ANSI B 16.5 . 
Chemical seals are used when media can falsify the pressure measurements due to high temperature, high viscosity (media in paste form) or their propensity to crystallise.
Chemical seals transmit the process pressure to the measuring instrument, with the diaphragm forming a hermetic seal between the medium and measuring instrument. With various process connection systems, the chemical seals  are especially suitable for general process engineering applications.
The medium wetted parts of these chemical seals are manufactured in stainless steel as standard. 
In connection with a Bourdon tube pressure gauge or Transmitter, they are suitable for pressure ranges from 0...0.6 bar to 0...250 bar.
The parts in contact with the medium can be manufactured in special materials for particular service conditions. 
When the permissible rated pressure is exceeded, a specially designed diaphragm prevents damage to the chemical seal.