Corrosive media damage to flow measuring instruments

Corrosive medium damages flow measuring instruments Corrosive medium is a serious threat to flow measuring instruments, only certain types of flowmeters such as clip-on ultrasonic flowmeters are less affected by corrosion. The corrosive medium corrodes the key parts of the flow measuring instrument that are in direct contact with the medium, causing damage and loss of function. For example, corrosion caused damage to the diaphragm of the differential pressure transmitter, and silicone oil leaked out and completely failed. Electromagnetic flowmeter electrodes cause medium leakage due to corrosion, causing excitation coils to burn out, etc. 13. The key components of the flow measuring instrument are corroded by corrosive media for a long time and their geometric dimensions are changed, resulting in a decrease in the accuracy of the instrument. For example, after the rotor in the rotameter is corroded by the fluid, the overall size is reduced, resulting in a low flow indication. Another example is that the vortex generator in the vortex flowmeter is corroded by the fluid and the width is reduced, and the surface of the upstream surface becomes rough, which causes the flow coefficient to change. Even clamp-on ultrasonic flowmeters that are less affected by corrosive media are often pitted due to the corrosion of the inner wall of the metal pipe by the medium, which weakens the transmitting and receiving signals, and loses sensitivity in severe cases. . shortened meter life. For example, parts such as conical tubes in metal tube rotameters, after several years of use, their welds are worn out. 1 Leakage of corrosive media, if not found and dealt with in time, may easily lead to safety and personal accidents.

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