Welded Chemical Seal

Diaphragm seals are used in order to prevent process sensitive mediums from entering the internals of a conventional pressure gauge.

System filled using FDA compliant fill fluid. Designed to be system filled to analogue gauges, digital pressure gauges, pressure transmitters.


  • Diameter: 63, 100, 160, 200mm, 250mm
  • Ranges: from -1 bar (-30″Hg) vacuum to 400 bar (6000 psi) pressure (subject to seal)
  • Accuracy: ±1.0% & ±1.6% FSD (subject to diameter)
  • Orientation: Bottom or rear
  • Threaded connections available: BSP, BSPT, NPT (male or female)
  • Connection sizes available: 1/4", 3/8", 1/2", 3/4", 1", 2"
  • Mounting options: Direct
  • Case filling: Dry or glycerine
  • Case material: 304 Stainless steel
  • Wetted parts: 316L Stainless steel
  • Window: Safety glass, polycarbonate
  • FDA approved system fill
  • Weather protection: IP 65


  • Custom ranges/dials
  • Customer logo
  • Indicating or Max drag pointer
  • Rubber shroud
  • Electrical contact
  • Other wetted parts available on request
  • 3.1 Material certificate

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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