Debugging expectation failures generally appear in the instrument installation and debugging stage, once eliminated, they will not appear again under the same conditions in the future. Common faults during the commissioning period are usually caused by improper installation, environmental interference, and fluid characteristics.

　　

　　1) Installation

　　

The fault is usually caused by the incorrect installation position of the electromagnetic flow sensor, such as installing the sensor at the highest point of the piping system that is easy to accumulate gas; or installing it on a vertical pipe from top to bottom, and emptying may occur; or after the sensor There is no back pressure, and the fluid is directly discharged into the atmosphere to form an incomplete measuring tube.

　　

　　2) Environmental aspects

　　

　　 is usually mainly caused by pipeline stray current interference, strong electromagnetic wave interference in space, magnetic field interference of large electric motors, etc. Pipeline stray current interference usually takes good separate grounding protection to obtain satisfactory results, but if it encounters strong stray currents (such as electrolytic workshop pipes, sometimes the peak value of the AC potential Vpp induced on the two electrodes can be as high as 1V). Additional measures and insulation between the flow sensor and the pipeline are required. Space electromagnetic wave interference is generally introduced through signal cables, and is usually protected by single-layer or multi-layer shielding.

　　

　　3) Fluid aspect

　　

　　 The evenly distributed tiny bubbles in the measured liquid usually do not affect the normal operation of the electromagnetic flowmeter, but as the bubbles increase, the meter

　　The output signal of the meter will fluctuate. If the bubble is large enough to cover the entire electrode surface, as the bubble flows through the electrode, the electrode circuit will be instantaneously disconnected and the output signal will fluctuate more.

　　

　　 low-frequency square wave excitation electromagnetic flowmeter measures the slurry with too much solid content, it will also produce slurry noise, causing the output signal to fluctuate.

　　

　　 When measuring mixed media, if the flow sensor is used for measurement before the mixing is not uniform, the output signal will also fluctuate.

　　

　　 Improper selection of electrode material and measured medium will also affect normal measurement due to chemical effects or polarization phenomena. The electrode material should be correctly selected according to the instrument selection or relevant manuals.