Diaphragm Seals

Diaphragm Seals, also referred to as chemical seals, are used in applications where the pressure sensor requires isolation from the process media. These applications may be corrosive, high temp, clogging, or require a sanitary fluid to remain captured in the piping or vessel. Rather than the process fluid interfacing with the pressure sensor, the pressure is exerted onto the flexible diaphragm and transmitted hydraulically to the instrument through the fill fluid. When properly mounted and filled a diaphragm seal assembly will have minimal effect on the instrument’s performance.

Diaphragm seals are designed to protect pressure instruments from hot process media and corrosive chemicals while minimizing any negative effect on instrument accuracy and durability. A well-made diaphragm seal can achieve this goal only if it is properly assembled, filled, and tested. REOTEMP’s highly trained technicians use state-of-the-art equipment so that every diaphragm seal assembly is filled and tested to assure optimal instrument performance:

  • 24-hour Minimum Fluid De-gassing
  • Evacuated Instrument Chamber Up to 10-8 mbar Absolute
  • Complete Fill Integrity Check
  • Fill-port Leak Test
  • Post-fill Static Test
  • Verification of Instrument Calibration
  • High-temp Pipe Sealant Used on All Threaded Joints (Welded Joints Upon Request)
  • Tamper-proof (Inspection Seal) Lacquer used on All Threaded Joints
  • Sturdy Diaphragm Packaging Protection

Additional Photos

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