How to improve the interference resistance of electromagnetic flowmeters

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Electromagnetic flowmeters are widely used in the chemical, water supply, and water treatment industries due to their high stability and precision； It has been promoted and loved by a large number of users. However, when measuring slurries, conventional electromagnetic flowmeters are often unable to effectively reduce the interference caused by spikes in slurry levels and noise, resulting in highly unstable measurement values that fluctuate greatly during use. Below is an example of the application of electromagnetic flowmeters in red mud measurement. Red mud is primarily produced in aluminum smelting plants. The red mud slurry contains 30% iron ions. The medium temperature can reach up to 95 degrees Celsius. This is because the company has not maintained good communication with the flow meter manufacturers. Instead, a standard electromagnetic flowmeter from a domestic company was selected. During use, noise and spike interference cause unstable measurements and suboptimal accuracy of the flow meter. Contact our company later. Specialized technicians were sent to the site to collect process media, and after observing the working environment, a digital filtering and measurement system based on imported, highly precise Freescale RAM LPC2132 dual-CPU units was designed. A dual-frequency giant wave excitation technique with strong anti-interference capabilities is used for excitation. For signal acquisition, the company has designed a three-electrode system that utilizes a ground electrode to balance the electromotive force due to liquid contact, thereby preventing signal fluctuations caused by the fact that the process pipes are non-metallic and cannot be properly grounded; multiple layers of signal shielding are also used. It effectively reduces and minimizes noise and spike interference. During the installation process, our company sends personnel to provide on-site guidance and communicate thoroughly with the client, ensuring that the client fully understands the performance of the instruments and reducing human errors resulting from improper installation and use. After the staff installed and calibrated the instruments, the measurements became stable, and the accuracy improved significantly. The original flow meter was successfully replaced, receiving positive feedback from users. The above examples illustrate that when selecting a flow meter, users must communicate thoroughly with the manufacturer, so that the manufacturer can fully understand the properties of the fluid being measured as well as the process conditions, and thus choose an appropriate model tailored to those characteristics. Improve the anti-interference capability of the flow meter.