Absolute pressure gauges 5. Technical Note Mechanical Pressure Gauges Indicating pressure gauges with an elastic measuring element are used very extensively to measure pressures in technical applications because they are both robust and easy to handle. These gauges incorporate measuring elements which deform elastically under the influence of pressure. Mechanical pressure gauges are produced with bourdon tube, diaphragm, and bellow and spring elements and are accordingly different. The measuring elements are made of copper alloys, alloyed steels or produced with special materials for specific measuring applications.
Pressures are only measurable in conjunction with a reference pressure.
The pressure is shown in standard measuring ranges on over 270 degrees on the dial. Liquid filled pressure gauges offer optimal protection against destruction by high dynamic pressure loads or vibrations as a result of their cushioning. Switching operations can be carried out when combined with alarm contacts. Compared with bourdon tubes, these diaphragm elements have a relatively high activating force and because of the circular clamping of the element they are insensitive to vibration. Moreover, the measuring instrument can also be protected against extremely corrosive media by coating with special material or covering with foil.