Methods for cleaning the electrode of insertion electromagnetic flowmeter : to inorganic pollution, the electrode is immersed in 0.1mol / L dilute hydrochloric acid for 30 minutes , washed with pure water , and then immersed 3.5MOL / L potassium chloride solution soak for 6 hours after use . Add 4% hydrogen fluoride solution immersed 3 ~ 5s, removed rinsed with distilled water , then soak for several hours in a solution of hydrochloric acid 0.1mol / L , the rinse with distilled water , calibration. Platinum polluted surface oxide film is formed , platinum or gold can be used for toothpaste polishing surface , and then washed with pure water , and then immersed 3.5MOL / L KCl solution soak for six hours after use . After contamination of organic oil and film , available detergent platinum or gold surface washed with pure water , and then immersed 3.5MOL / L potassium chloride solution soak for 6 hours after use.