the pressure element is a thin, round metal diaphragm with concentrical waves, which are fixed between two flanges. If the diaphragm is stressed partially with a pressure it bends. By a lever the pass effects on the movement.
According to the strength and caliber of the diaphragm different pressure ranges between 16 mbar and 40 bar are reached. Diaphragm pressure gauges are more resistant against shocks and vibrations than bourdon tube pressure gauges.
By using adequate materials diaphragm pressure gauges are useable in any kind of gases, steams and fluids. In executions with opened flanges this pressure gauges are also suited for measuring semifluid mediums.