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Onyx Isolator Ring-PSR
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Onyx Isolator Ring-PSR


The Onyx Isolator Ring PSR series is a reliable and accurate solution for measuring pressure in challenging applications involving slurries and corrosive fluids. Designed for compatibility with flanged pipe connections, the PSR features full face thru bolt holes that match the bolt circle of mating flanges, ensuring precise alignment and making it the perfect choice for use with non-metallic flanges.

The inside diameter of the PSR is engineered to match standard pipe sizes, resulting in smooth, unobstructed flow, self-cleaning operation, and minimal turbulence and friction. Onyx's ultra-deep vacuum filling process guarantees the highest accuracy in the industry, while the patented "Module Seal" - a standard feature on all Onyx Isolator Rings - enables instrument replacement or calibration without interrupting the process.


  • Absolute immunity to clogging
  • Available with either 150# or 300# ratings
  • Integral snubber eliminates gauge fluctuations at no additional cost
  • Instruments can be replaced without vacuum filling
  • Immune to errors caused by ambient temperature fluctuations
  • No tools are required to change pressure instruments
  • Equipped with an integral block valve and module seal


  • Slurry pressure measurement
  • Corrosive fluid pressure measurement
  • Applications requiring flanged pipe connections
  • Installations using non-metallic flanges
  • Processes demanding smooth, unobstructed flow and self-cleaning operation


  • Accurate pressure measurement in challenging slurry and corrosive fluid applications
  • Precise alignment with flanged pipe connections
  • Smooth, unobstructed flow with minimal turbulence and friction
  • Highest accuracy in the industry due to ultra-deep vacuum filling
  • Seamless instrument replacement or calibration without process interruption



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