A diaphragm seal is a useful accessory to protect your pressure measurement instruments from corrosive media or clogging from sludge or slurries, especially in wastewater processing. But diaphragm seals can also be at risk of clogging, which can lead to equipment failure and put a stop to your process. So, how can you help protect your diaphragm seal from the negative effects of this type of process media?

This article was originally published on April 18, 2022, and was updated on April 17, 2024. No matter what industry you work in, diaphragm seals (also referred to as isolators) and welded assemblies are used to protect your pressure and temperature instrumentation from corrosive process media. After decades of making quality pressure and temperature gauges and sensors to help keep processes performing reliably and efficiently, Ashcroft has seen just about every scenario where something can go wrong. One reason we like to share our expertise is to help people like you who may be experiencing a similar issue that we can help solve. In this article, you will learn what a welded diaphragm seal assembly is and how it is used to help mitigate the damaging effects of high temperature, pulsation and vibration endured by your instruments. You will also see how these assemblies can ensure reliable and accurate pressure readings of your process. When you are done, you will find links to additional resources that can help you learn more about related topics.

This article was originally published on January 31, 2022 by John Varkonda and was updated on May 8, 2024, by Todd Thomas. Keeping pressure measurement instruments from becoming damaged in harsh environments is a challenge in many industries, including water/wastewater. Diaphragm seals play a vital role in these applications by creating a leak-tight and corrosion-resistant barrier between a pressure instrument and your process. For many, a flanged diaphragm seal connection is a great choice because it provides a convenient way to attach instrumentation directly onto flanged process piping without having to use threaded connections. But proper installation of these seals is the key to getting the most protection. Ashcroft is a recognized global leader in pressure and temperature instrumentation and uses our decades of experience to educate and guide customers to the solutions that best meet the challenge at hand. In this article, you will learn a bit about flanged diaphragm seals, the basic principles of torque and best practices for installing a flanged diaphragm seal in your process. When you are done reading, we will also share additional resources that may be beneficial to you.

There’s a wide range of accessories for your pressure instruments that can help make your process safer, more efficient and precise. Snubbers, dampeners, capillaries, pressure limiting valves, siphons and other accessories are common additions to the most challenging applications. One question I’ve heard often during my time in this industry is: do these accessories impact the accuracy of pressure measuring instruments?