How do you know the bellows pressure gauge work?

Bellows pressure gauge is suitable for measuring no explosion danger, crystallize, solidify, as well as the effect on copper and copper alloy corrosion were of low pressure liquid, gas or steam. Widely applied to boiler ventilating, gas pipeline, burning device and other similar devices. Do you know bellows pressure gauge is how to work? Bellows of bellows pressure gauge sensor connected by two pieces of circular waves of diaphragm. Measuring cavity inside the membrane box, medium pressure deformation caused by the medium can be used to indirectly measure the pressure. The size of the pressure value showed by the pointer. Bellows pressure gauge are commonly used to measure the pressure of the gas, and can measure micro pressure, over voltage protection to a certain extent, is also possible. When several bellows sensitive element fold together will produce larger to measure the pressure of the tiny heritability. Bellows pressure gauge measuring range in - 80 ~ 60000 pa, but according to the different pressure range choose different bellows pressure gauge, pressure in - 1000 pa ~ 60000 pa advice when choosing disc type bellows pressure gauge, if the pressure in the - 80 pa advice when choosing the rectangular bellows pressure gauge.