Proline Promass 83O/84O Coriolis flowmeter is designed for use in corrosive, high-pressure and high-temperature environments in the oil and gas industry. Key parts are manufactured from super duplex stainless steel with 25% Cr (25 Cr duplex), which offers high protection against saline seawater and other corrosive materials found in crude oil and natural gas. The T316L stainless steel external design also resists corrosion from salt and sea water exposure.