- 1. Equipment is generally electromagnetic flowmeter sensor equipment location is not correct resulting in shortcomings, common such as the sensor equipment in the pipe system easy to accumulate gas; or equipment in the vertical pipe from top to bottom, there can be emptying; or sensors, no back pressure, the fluid is discharged directly into the atmosphere and constitute a measurement of the pipe is not full of pipe.
- 2.Environmental aspects are generally the first pipeline stray current annoyance, space, strong electromagnetic wave annoyance, large motor magnetic field annoyance. Pipeline stray current annoyance can be satisfied with the general use of grounding protection, but such as the encounter of strong stray current, the need to use other methods and flow sensors and pipeline insulation and so on. Space electromagnetic wave disturbance is generally introduced by the signal cable, generally choose a single layer or multi-layer shielding to be protected.
- 3.Fluid side of the measured liquid contains a uniform distribution of fine bubbles generally does not affect the normal operation of the electromagnetic flowmeter, but with the increase in bubbles, the instrument output signal will appear firm, if the bubbles are large enough to conceal all the electrode surface, followed by bubbles flowing through the electrodes will make the electrode circuit break in a flash and make the output signal appear greater firm. Low-frequency square wave excitation of electromagnetic flowmeter measurement of solids content is too much slurry, will also have a slurry noise, so that the output signal is not firm. Measurement of mixed media, if the mixture is not uniform before entering the flow sensing measurement, will also make the output signal is not firm.
Improper selection of the electrode material and the measured medium will also affect the normal measurement due to chemical action or polarisation appearance. Electrode materials should be selected correctly according to the surface selection or relevant manuals.
Above is the electromagnetic flowmeter manufacturers share "electromagnetic flowmeter in the commissioning period when the shortcomings". Thank you for watching. If you have any questions, you can consult online or leave us a message. We will wholeheartedly answer for you.
