This European Standard specifies requirements for diaphragm and capsule indicating pressure gauges, vacuum gauges and combined vacuum and pressure gauges (compound gauges), from 50 to 250 nominal size with ranges up to 25 bar for the measurement of gauge pressure.
DS/EN 837-3:1998 history
1998DS/EN 837-3:1998 Pressure gauges - Part 3: Diaphragm and capsule pressure gauges - Dimensions, metrology, requirements and testing