An Isolation diaphragm is a thin membrane which is used to isolate the media on one side of a diaphragm from media on the other side, whilst allowing the transmission of pressure with minimal loss.
Isolation diaphragms are incorporated into some core pressure sensor technologies to protect the various components used in the design from exposure to a corrosive pressure media and to provide compatibility with a broader range of liquid and gas types. Typically the space behind the isolation diaphragm will be filled with a silicone oil which is a good electrical insulator with a low freezing point and vapour pressure.
Add-on isolation diaphragm assemblies are used to separate highly corrosive media from instrumentation which would otherwise deteriorate or fail when exposed to it. Another use is to provide a buffer between high temperature pressure media and sensing technology which has a much lower operating temperature range.
Isolation diaphragms are often made from materials with different corrosion properties such as Stainless Steel 316L, Hastelloy C276, Duplex, Titanium, Tantulum or Monel, expanding the media compatibility of a product.
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