Ammonia pressure gauge

1. Select based on the operating environment and the properties of the medium being measured. ⑴For measuring the pressure of ordinary media such as air, water, and water vapor, a standard spring tube pressure gauge can be used. ⑵In harsh environments with high atmospheric corrosion, plenty of dust, and the presence of liquids that can spray around, it is advisable to use enclosed all-plastic pressure gauges. ⑶When measuring media such as gaseous ammonia, liquid ammonia, oxygen, chlorine, acetylene, and alkaline solutions, special pressure gauges should be used. (Ordinary springs) ⑷. For measuring corrosive media (such as acids and alkalis), acid-resistant pressure gauges or pressure gauges with stainless steel diaphragms resistant to corrosion should be used ； When the medium contains solid particles, viscous liquids, crystals, or scum, a diaphragm pressure gauge should be used. ⑸In situations with highly pulsating media or strong mechanical vibrations, shock-resistant pressure gauges or marine pressure gauges should be used.

I think the error here lies in the term \"alloy steel material\" used in the answer; Baidu indicates that the main alloying elements of alloy steel include silicon, manganese, chromium, nickel, molybdenum, tungsten, vanadium, titanium, niobium, zirconium, cobalt, aluminum, copper, boron, and rare earth elements. ”Note that there is copper inside, but ammonia must not come into contact with copper. Therefore, this question is marked wrong.