Isolation seals protect transmitters while faithfully conveying pressure signals. They enhance the measurement of not only pressure and vacuum, but also of derived variables, including flowrate, level and density. Because of their measurement flexibility, electronic differential pressure (DP) transmitters are widespread throughout industrial and municipal processes.
Although the typical DP transmitter has a metallic isolation diaphragm to help protect it from exposure to the media being measured, many difficult applications make this protection ineffective. In such cases, the measuring system must include some way to keep the measured fluid from directly contacting the transmitter, while nevertheless responding quickly and accurately to changes in the measured variable.