DIFFERENTIAL PRESSURE GAUGE MECHANISM

Gas at the higher pressure is delivered into the lower chamber of the gauge where it applies a force on the bottom of bellows 1. Gas at the lower pressure is delivered into the bellows. The difference in the pressures acting on the bottom of the bellows is counterbalanced by spring 2 whose number of active coils can be varied by turning insert 3. Owing to the pressure difference, the bellows is co…