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In industry, a flow meter is a device used for measuring flow rates, and an electromagnetic flow meter is also a type of flow meter. Generally speaking, different types of electromagnetic flow meters are used in various applications. 1. In industries such as metallurgy, papermaking, and sewage treatment, electromagnetic flowmeters are generally of the separate type with large-diameter flange connections; whereas in industries such as biomedicine and chemicals, smaller-diameter, integrated clamp-type connections are more commonly used. The specifications required for electromagnetic flowmeters vary depending on the industry. 2. In industries such as food hygiene and pharmaceuticals, it is required that the sensors of electromagnetic flowmeters be easy to remove, which facilitates cleaning and allows for regular steam sterilization. Therefore, in the hygiene industry, electromagnetic flowmeters must meet hygienic specifications. 3. The meters used in these channels are submersible types, primarily intended for use in industrial drainage systems and sewers; they rely on the power of hoists to carry out the drainage tasks. At the same time, the sensor of the electromagnetic flowmeter must be installed under the baffle in the open channel and remain submerged in water for an extended period of time. 4. In some special environments, such as those requiring explosion-proof properties, instruments need to have excellent resistance to explosions and fires. In such situations, the energy of the excitation current is very high; electromagnetic flowmeters can be classified into airtight types, diaphragm types, and sand-filled types. With the rapid development of technology, the power of the excitation current has decreased significantly. Therefore, the most common type of flow meter used in explosion-proof environments is the safety spark type; it consists of a flow sensing unit and a conversion unit, and is primarily used in hazardous areas.