The importance of selecting the lining material for electromagnetic flowmeters

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When measuring different media, there may be a certain degree of corrosivity, which necessitates considering the choice of lining material for an electromagnetic flowmeter. The lining is a fundamental component of electromagnetic flowmeters. The proper selection of the lining material has a direct impact on the performance, operational stability, and lifespan of these flowmeters. So how should one choose the lining material? Selection of lining material for electromagnetic flowmeters: It should be chosen based on the corrosivity, wear resistance, and temperature of the medium being measured. Rigid/soft rubber can resist corrosion from mild acids and bases; it can withstand temperatures up to 65°C. Soft rubber has wear resistance. Polytetrafluoroethylene (PTFE) can resist corrosion from strong acids and bases with the exception of hot phosphoric acid, and it can handle medium temperatures of up to 130°C, but it lacks wear resistance. Polyurethane rubber oil has good wear resistance, but it is not resistant to acid and alkali corrosion; its temperature tolerance is also poor, with the medium temperature should be below 65°C. Lining material, main functions, scope of application: Rigid rubber 1. Can resist hydrochloric acid, acetic acid, oxalic acid, ammonia water, phosphoric acid, as well as 50% sulfuric acid, sodium hydroxide, and potassium hydroxide at room temperature. 2. Avoid strong oxidizing agents. 1. Below 65°C 2. Ordinary acid, alkali, and salt solutions Soft rubber 1. It has good elasticity and excellent wear resistance. 2. Resistant to corrosion by low-concentration acids, bases, and saline media; not resistant to corrosion by oxidizing media. 1. Below 65°C. 2. Suitable for measuring ordinary water, sewage, sludge, and mineral slurries. Polytetrafluoroethylene (PTFE), Modified polytetrafluoroethylene (PFA). 1. One of the materials with the most stable chemical properties among plastics; capable of withstanding boiling hydrochloric acid, sulfuric acid, nitric acid, and aqua regia. It can also withstand strong alkalis and various organic solvents. 2. Poor wear resistance and adhesion. 1. -40℃～+130℃ (PTFE) –40℃～+130℃ (PFA) 2. Highly corrosive media such as acids and bases 3. Hygienic media