Working principium:
The gauge is made up of pressure transfer system (including connector, bourdon tube, throttle etc.), gears, indicating device (pointer and dial) and outer shell (including crust, cover and glass etc.), the outer shell is air-proof structure, it can protect the internal parts from ambient effect.
All stainless steel pressure gauge with silicon oil filling can protect itself from sharp vibrancy condition and pulsation of media.
Material of the pressure transfer system and outer shell
Stainless steel pressure gauge

All parts of all stainless steel pressure gauge are made from stainless steel, The material of the main parts are OCr17Ni12Mo2(316). The gauge is suitable for strongly corrosive gaseous condition, and are used in a wide range of industries, including chemical, metallurgy, petrochemical, chemical fiber, electric power and so on. https://www.hongqiinstrument.com/pressure-gauge/pressure-gauge-for-certain-gases/stainless-steel-pressure-gauge-jh-yl-tnbe.html