Bellows Pressure Gauge uses a diaphragm as a sensitive element for measuring minute pressures. It measures low and negative pressures in gases that are non-corrosive to copper alloys and non-explosive. It is widely used in cobalt furnace ventilation, gas pipelines, combustion equipment, and other similar equipment. Bellows Pressure Gauge consists of a measuring system (including connectors, diaphragm), a transmission mechanism, an indicating device, and a housing.When the pressure of the measured medium acts on the diaphragm, its free end undergoes a corresponding elastic deformation—displacement. This displacement is amplified by a lever-driven transmission mechanism, and the indicating device displays the measured pressure on the instrument dial.