1. When used for measuring special media such as viscous or acid-base, diaphragm pressure gauge, stainless steel spring tube, stainless steel movement, stainless steel shell or bakelite shell should be used.
According to the measured medium, the pressure gauge should have the specified color code and indicate the name of the special medium. The oxygen gauge must be marked with the word "oil-free" in red. The dark green underline color code for hydrogen and ammonia. Yellow underline color coding and so on.
2. According to the purpose of the pressure gauge, it can be divided into ordinary pressure gauge, ammonia pressure gauge, oxygen pressure gauge, electric contact pressure gauge, remote transmission pressure gauge, vibration resistant pressure gauge, pressure gauge with inspection pointer, double needle double tube or double needle single Tube pressure gauge, digital display pressure gauge, digital precision pressure gauge, etc.
3. When installing against a wall, a pressure gauge with an edge should be selected; when directly installed on a pipe, a pressure gauge without an edge should be used; when used for direct gas measurement, a pressure gauge with a safety hole on the back of the case should be used. For consideration of pressure measurement position and easy observation and management, the diameter of the case should be selected.
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