Flanged Diaphragm Seal

Flanged diaphreagm seals are used to prevent aggressive or contaminating medium from entering the internals of a conventional pressure gauge.

Available with a selection of flange patterns, diameters, pressure ratings and wetted parts.

Please contact us and we can advise you on the appropriate seal to suit your application.


  • Diameter: 63, 100 & 160mm
  • Ranges: from -1 bar (-30″Hg) vacuum to 250 bar (3600 psi) pressure
  • Accuracy: ±1.0% & ±1.6% FSD (subject to diameter)
  • Orientation: Bottom entry
  • Connections: ANSI B 16.5 RF: 1″, 1.1/2″, 2″, 3″ & 4″ | ANSI B 16.5 RTJ: 1″, 1.1/2″, 2″, 3″ & 4″ | EN 1092-1, form B: DN25, DN40, DN50, DN80 & DN100
  • Mounting Options: Direct
  • Case Filling: Dry or Glycerine
  • Case Material: 304 Stainless steel
  • Wetted Parts: 316L Stainless steel
  • Window: Safety glass
  • Weather Protection: IP 65


  • Custom ranges/dials
  • Customer logo
  • Indicating or Max drag pointer
  • Rubber shroud
  • Electrical contacts
  • Other wetted parts: Monel, Hastelloy, PTFE, Tantalum, Inconel etc.
  • Material certificates

Calibration Notes

  • Traceable to National Standards
  • UKAS

If you have any questions, please contact us on +44 (0) 117 965 4615 or visit our enquiry page and submit the form.

We can also customise our products to your specific needs.

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Leading industry standards

NQA ISO9001 Accredited and Achilles Affiliated

  • UKAS logo
  • Achilles logo
  • NQA UKAS logo
  • BEMA logo
  • QAS International ISO 14001:2025 logo

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