Wednesday, September 21, 2011

Diaphragm Seal or Chemical Seal Application

Diaphragm seals, also referred to as chemical seals, are used to isolate pressure gauges, switches, and transmitters from clogging and/or corrosive media. Standard diaphragm seal bodies and diaphragms are made of stainless steel; however, a variety of materials from carbon steel to Hastelloy® C-276 are available to meet the demands of most applications. WIKA diaphragm seals can operate in pressure applications from 10" H2O to 20,000 psi and media temperature between -130°F and 752°F.

  • The media is corrosive and may damage a sensitive element such as a Bourdon tube gauge, pressure switch or transmitter diaphragm.
  • The temperature of the media may be too high for a standard gauge, switch or transmitter to operate properly.
  • The media is highly viscous or tends to crystallize, or polymerize and may clog the pressure port of a gauge, switch or transmitter.
  • The media is non-homogenous or contains suspended matter such as wood pulp which may clog the pressure port of a gauge, switch or transmitter.
  • Remote reading is required. A diaphragm seal with a capillary line will allow remote installation of a pressure instrument.
  • The sanitary cleanliness level is critical. A flush mounted or INLINE SEAL™ sanitary type diaphragm seal avoids dead space and cavities.
  • The media is toxic or hazardous and may pollute the environment. A suitably designed diaphragm seal will provide additional protection.
  • The application requires high overpressure protection. A diaphragm seal with a contoured diaphragm bed can be configured to provide overpressure protection and protection to the instrument.
WIKA diaphragm seal systems are an excellent value and offer savings by:
  • Meeting fugitive emission requirements
  • Extending the service life of the pressure instrument
  • Reducing the cost of installation
  • Reducing or eliminating maintenance costs
If you would like additional information about WIKA Diaphragm Seals or other WIKA Products please contact Forberg Scientific, Inc.
Toll Free: 855-288-5330

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