How to choose the electromagnetic flowmeter : The measurement of the flow is very complicated. In order to achieve accurate measurement, it is necessary not only to understand the principle and characteristics of the flowmeter, but also to pay attention to the relevant matters of the entire measurement system. In the case of using it, it is necessary to pay attention to several aspects such as selection, installation, and use. Note on selection: (1) The choice of the electromagnetic flowmeter lining will directly affect the correct use and life of the electromagnetic flowmeter. Therefore, depending on the temperature, pressure, speed of the fluid to be tested, as well as the hardness, content and particle size of the solid particles, different linings should be selected. (2) The range of the electromagnetic flowmeter should be suitable for the actual needs of the process parameters. The process range is 80% to 90% of the selected electromagnetic flowmeter range; the lower limit of the measurement should take into account the signal-to-noise ratio of the electromagnetic flowmeter detector; the adapted fluid pressure range is: -0.098 MPa to 2.941 MPa, because of the fluid pressure Too high will affect the life of its electrodes. Too low may cause the lining to fall off. (3) If the fluid contains magnets such as iron sand, it will disturb the magnetic field of the meter and produce corresponding errors; if the fluid contains bubbles. The measured flow rate is the volume flow rate including the bubble; if the fluid is precipitated or scarred. It will cause the electrode to be covered by foreign matter and cause zero fluctuation of the meter. At present, electromagnetic flowmeters use ultrasonic waves on their measuring electrodes to eliminate the precipitation and crusting of fluids on the electrodes. (4) Particles in the fluid may strike the electrode to form spike noise. Affects the stability of the flow meter indication. In this case, an electromagnetic flowmeter in which an electrode is covered with a porous ceramic or a conductive rubber can be used. (5) Flow rate , which determines the flow rate of the selected large scale flow according to the maximum flow rate . The above is the selection of electromagnetic flowmeter Address of the company: No. 8, Huancheng West Road, Jinhu County, Huai'an City, Jiangsu Province RTJ Flanges,ASME B16.5 Flanges,RTJ Sealing Flanges,RTJ Blind Flanges Shandong Zhongnuo Heavy Industry Co.,Ltd. , https://www.zhongnuoflange.com
(6) Determine the diameter of the flowmeter based on the flow rate and the size of the industrial pipe . Flowmeters that are consistent with the pipeline are generally selected .
(7) Select the lining of the flow meter based on the characteristics of the measured medium . Such as temperature, corrosiveness , whether there is a negative pressure in the pipeline, and so on. Typical linings are PTFE, soft rubber , hard rubber, PFA, ceramics, and the like.
(8) Select the material of the measuring electrode according to the characteristics of the medium . Generally there are 304, 316, Hastelloy , titanium, tantalum and the like.
(9) Select the pressure level of the flanges connected on both sides according to the pressure level of the process piping .