What is a capsule pressure gauge?

Basically the capsule consists of two thin, concentrically corrugated diaphragms welded or attached together. The pressure change in the capsule causes elastic deformation on both sides of the measuring element. The travel of the measuring element is proportional to the pressure being measured. It will be transmitted to a pointer using a geared movement and indicated on a dial with a 270° angle. Capsule pressure gauges are used for measuring low positive or negative values up to 600 mbar. The accuracy is ± 1,6% of full scale deflection. Capsule is made of Brass or SS316. and is only used to measure gases. And this ambient temperature will be -20 +60 °C; The medium temperature shall not exceed +100°C.