Introduction
As the most important raw material in human production and a necessity in daily life, water resources are suffering unprecedented destruction with the acceleration of the industrialization process. The protection and treatment of water resources have reached an urgent situation. The pollution of water resources mainly comes from the discharge of industrial water, as well as the massive discharge of various production and domestic sewage in cities. At the same time, the requirements for the operation of various types of sewage treatment equipment, and the monitoring of sewage treatment water quality and water volume have also become higher.

Sewage is divided into industrial sewage and civil sewage. Industrial sewage is generally corrosive. When purchasing an electromagnetic flowmeter, you need to pay attention to the choice of lining and electrode. For sewage with a relatively large amount of sand, we must consider the wear resistance of electromagnetic flowmeters, choose wear-resistant linings and electrodes, generally choose polyurethane or ceramic linings. From the economic cost, choosing polyurethane is more economical. For the electrode selection of electromagnetic flowmeter, wear-resistant tungsten carbide electrode is generally selected.

For the electromagnetic flowmeter to measure corrosive sewage, we can choose tetrafluoroethylene lining. The choice of electrode is based on the characteristics of the sewage, and the corrosion-resistant material is selected. Generally there are HC, HB, titanium, tantalum, platinum materials.
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