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How to properly select the material for electromagnetic flowmeters: As a commonly used instrument for flow measurement, the choice of material for electromagnetic flowmeters is a very important factor. In electromagnetic flowmeters, the parts that come into contact with the medium are only the electrodes and the interior of the measuring tube; therefore, depending on the properties of the different media, it is necessary to select the appropriate materials for the electrodes and lining. I. Selection of electrode materials: Generally, electrode materials fall into the following categories: 1. Stainless steel (0Cr18Ni12Mo2Ti). Suitable for nitric acid, sulfuric acid with less than 5% at room temperature, boiling phosphoric acid, formic acid, alkaline solutions, sulfurous acid at a certain pressure, seawater, and acetic acid. 2. Hastelloy B, Hastelloy C. It can be used in seawater and brine. 3. Titanium. Suitable for seawater, various chlorides and hypochlorous acids, oxidizing acids (including fuming nitric acid), organic acids, alkalis, etc. 4. Tantalum. All chemical media other than hydrofluoric acid, fuming sulfuric acid, and alkalis can be used, including hydrochloric acid, nitric acid at boiling point, and sulfuric acid at <175°C. 5. Platinum. It can be used with various acids, bases, and salts, but not with aqua regia. II. Selection of Lining Material Another important aspect regarding the material selection for electromagnetic flowmeters is how to accurately choose the lining material. It must be noted that the lining material should be selected based on the corrosivity, wear resistance, and temperature of the medium being tested. 1. Rubber. It possesses excellent elasticity, high tensile strength, good wear resistance, and resistance to mild acids and bases; it can be used to measure water, sewage, sludge, and mineral slurries. 2. Polyurethane. It has excellent wear resistance, but poor resistance to acids and alkalis; it can measure coal slurry, mud, and mineral slurry subjected to severe wear. 3. Polytetrafluoroethylene. It is resistant to boiling hydrochloric acid, sulfuric acid, nitric acid, aqua regia, concentrated alkalis, and various organic solvents; it has good wear resistance but poor adhesion properties. The above covers the selection of materials for electromagnetic flowmeters. Different media have different properties, and it is not necessary to choose the most expensive option; selecting the right one is what ensures cost-effectiveness and durability. For more information, please visit the company’s official website at http://www.yb1518.com/. Please retain this link when reproducing the content!