Diaphragm pressure gauge

The diaphragm pressure (by experts as a plate spring manometer called) is a pressure gauge . The pressure is measured by bending a thin sheet of metal and thereby turning a pointer .

Special membrane manometers for measuring atmospheric pressure are called barometers .

Diaphragm pressure gauges are characterized by high robustness compared to conventional Bourdon tube devices, i.e. by overloadability . The choice of materials is also much greater than with conventional pressure gauges. The membrane can not only consist of stainless steel , but also of acid-resistant materials such as Monel . It is also possible to glue the stainless steel membrane with other materials such as tantalum or Teflon and thus improve the chemical resistance .

Diaphragm pressure gauges, however, also have serious disadvantages: Due to the low spring deflection of only approx. 1.5 mm, they have a comparatively low accuracy of only 1.6%, and the linearity of their spring characteristic often leaves something to be desired.

The realizable measuring ranges are between 16  mbar and 40 bar.