Device for measuring pressure levels in fluid media. They may function directly (e.g. vertical column pressure gauge) or indirectly, whereby elastic deflections, for example, are used to record the pressure level.
The pressure gauges used in fluid technology almost always operate indirectly via measuring devices with a spring, whose deflections are relayed to a pointer. In terms of the structure, a distinction is made between tube-type, diaphragm, bourdon tube and corrugated tube pressure gauges (Figure M 1 a and b).