{"id":10615,"date":"2019-01-24T06:40:17","date_gmt":"2019-01-24T11:40:17","guid":{"rendered":"https:\/\/blog-stage.wika.cloudpowered.services\/us\/\/?p=10615"},"modified":"2023-11-30T12:43:16","modified_gmt":"2023-11-30T17:43:16","slug":"diaphragm-seal-overview-basic-principle-and-applications","status":"publish","type":"post","link":"https:\/\/blog-stage.wika.cloudpowered.services\/us\/knowhow\/diaphragm-seal-overview-basic-principle-and-applications\/","title":{"rendered":"Diaphragm Seal Overview: Basic Principle and Applications"},"content":{"rendered":"

A diaphragm seal makes measuring pressure safer and more reliable \u2013 even in extreme working conditions \u2013 and is ideal for protecting pressure instrumentation and process transmitters. Discover the basic principle behind diaphragm seals and when to use them.<\/strong><\/p>\n

It often isn\u2019t a problem when the process medium comes into direct contact with pressure gauges, pressure transmitters, or other pressure instruments<\/span>. However, harsh media and environments can damage a sensor\u2019s internal pressurized parts. In these instances, a diaphragm seal can make all the difference between reliable and unreliable readings.<\/p>\n

The purpose of a diaphragm seal is to isolate a pressure measuring instrument from the process media. It is often used for the most difficult measuring tasks, such as when the environment\u00a0is extremely hot or cold, or when a process connection is difficult to attach to the measuring instrument. Diaphragm seals are also used when the media being measured is corrosive, viscous, sticky, or easily solidified<\/a>, or when the process isn\u2019t chemically compatible with the instrument material.<\/p>\n\n

\"Diagram

A diaphragm seal is a thin, flexible wall that separates the media being measured from the pressure measuring instrument.<\/p><\/div>\n \n

What Is a Diaphragm Seal?<\/h2>\n

Typically connected to a pressure gauge, process transmitter, or pressure switch, a diaphragm seal is a thin, flexible wall that separates the media being measured from the pressure measuring instrument.<\/span><\/span> The space between the diaphragm and the measuring instrument is filled with a system fluid (transmitting fluid), which hydraulically transmits pressure from the flexible diaphragm. The contact surface between the media and the diaphragm is relatively large, which ensures more accurate pressure measurements \u2013 especially for very low pressures (< 600 mbar).<\/p>\n

By preventing media from contacting the pressure measuring element directly, a diaphragm seal also:<\/p>\n