What is the function of the movement and bourdon tube of the pressure gauge?

The movement and the bourdon tube are the two most important components of the pressure gauge.Under the action of pressure, the bourdon tube deforms the tube end to produce displacement, and this displacement is often very small, When the displacement of the free end of the spring tube is only a few millimeters, if you want to change the linear displacement of the tube end into the angle of the pointer’s displacement to indicate the scale value, it can only be completed by the movement, so the movement plays the role of transmission and amplification in the pressure gauge.