Fluid corrosiveness is a major factor in determining flowmeter material. For various petroleum products, cast steel and cast iron are used. For slightly corrosive chemical liquids and cold water, it is made of copper alloy. Made of stainless steel for pure water, high temperature water, crude oil, asphalt, high temperature liquids, chemical liquids, food or food raw materials. The corrosion resistance of positive displacement flowmeters is generally not strong. In the food and biopharmaceutical industries, due to hygiene requirements, flow meters are frequently sterilized. Fittings that come into contact with fluids must be made of stainless steel and other hygienic materials. They must be easily disassembled.