Diaphragm type pressure gauges are available from many different materials, including 316 SST, Hastelloy C, MONEL, TEFLON and many others. For gaseous and liquid, aggressive and highly viscous or contaminated media, also in aggressive ambience.

When the pressure P of the measuring medium acts on the diaphragm type pressure gauges, the diaphragm deforms and compresses the sealing liquid of the pressure measuring system of the pressure instrument to form a pressure of P-Delta P. When the rigidity of the diaphragm seal type pressure gauge is small enough, Delta P is also very small, and the pressure formed by the pressure measuring system of the pressure meter is close to the pressure of the measuring medium.