A remote seal system is a way to remotely sense pressure using a liquid-filled system connected to the pressure transmitter. People generally use remote seals for isolation from the process, connection with a process that requires high temperature, and because “it’s the way we’ve always done it.” Frankly, in my opinion, we use remote seals too often.
We should always look for ways to eliminate the remote seal if possible because they increase the price and decrease the performance of the pressure transmitter. That said, they are beneficial in some circumstances.
When would we need to use remote seals?
There are four situations in which you would benefit from using a remote seal.
How do I decide what type of seal I should use?
Identifying the proper remote seal for your process depends on what process connection you need.
The most popular remote seal is a flanged process connection that is usually 2 or 3 inch flange. Remote seals can also be used for threaded, sanitary or many other types of process connections. Regardless of the process connection requested, the span to be measured also dictates the diameter of the diaphragm used in the seal. To maximize performance, we recommend using a remote seal that will have a large 3.5” diameter diaphragm on the remote seal. Using a 3.5” diameter allows good performance down to spans as low as 50 inH2O. For Remote Seal Applications with spans lower than 50 inH2O contact Tech Support (800-333-7421).
If you have further questions on remote seal systems, please write a comment below and we’ll happy to chat with you!