What are the differences between pressure gauges for special media and ordinary pressure gauges?
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In actual production, pressure gauges specific to media such as oxygen, hydrogen, acetylene, and ammonia are encountered. Oxygen pressure gauges indicate that oil must be avoided, acetylene gauges suggest that copper must be avoided – but what should be avoided for hydrogen? There’s also a nitrogen pressure gauge; I really don’t understand what needs to be banned. Please, experts, help me figure this out!
Oxygen pressure gauge: Since oxygen can ignite in combination with lubricating/sealing greases at high pressures, the dial is marked with “Oil prohibited”. Ammonia pressure gauge: As ammonia reacts easily with copper, and most pressure gauge Bourdon tubes are made of copper, the parts that come into contact with ammonia must be made of stainless steel； Hydrogen pressure gauge: Since hydrogen can easily cause metal to develop \"hydrogen embrittlement\" under high temperatures or pressures, pressure gauges used in such environments require special treatment