During the production and operation of the intelligent split-type sewage electromagnetic flowmeter, various faults may occur. 1. Instrument indication errors caused by faults of the instrument itself, including damage to the structural components or parts of the instrument, etc. 2. The faults are caused by the installation environment of the instrument or improper installation, such as the straight pipe sections installed upstream and downstream of the sensor not meeting the requirements, the measured medium not filling the pipeline, and electromagnetic interference in the measurement environment, etc.