Diaphragm seals are used for pressure measurement when the medium must not come into contact with the pressure-bearing parts of the pressure measuring instrument. The diaphragm seal – a process connection with a separating diaphragm – separates the measuring instrument from the medium with an elastic diaphragm and transfers the pressure to the measuring instrument. The inner space between the diaphragm and the pressure measuring instrument is completely filled with a pressure transmission fluid. If pressure is generated from the medium, the pressure is transmitted via the elastic diaphragm to the liquid and further to the measuring device.

If measuring instruments are connected to the process via a diaphragm seal, the most difficult measuring tasks can be realised. Diaphragm seals are used in conjunction with Bourdon tube pressure gauges, pressure switches, transmitters and differential pressure transmitters. Optimum diaphragm seal designs, materials and filling media are available for every application.