Intelligent electromagnetic flowmeters are gaining traction in the market due to their unique advantages, yet as their numbers grow, the industry faces significant challenges. Despite these difficulties, the technology's inherent strengths ensure continued stability. These flowmeters operate without moving parts, offer unobstructed fluid paths, and require minimal maintenance. Emerging industries like food and beverage processing, as well as pharmaceuticals, present new opportunities for growth.
As environmental regulations become stricter, the demand for flow totalizers is expected to rise, particularly in clean water and wastewater treatment sectors. However, there are negative factors at play, such as overcapacity in manufacturing and limited capital investment. Industries like chemicals, paper, and mining, which rely heavily on recycling, are currently experiencing slow growth. Combined with an overall weak economic outlook, this has hindered the expansion of electromagnetic flowmeters.
To ensure reliable operation and accurate measurements, it's essential that electromagnetic flowmeters are properly grounded. Avoid connecting the grounding wire to the common ground of motors or other equipment. In most cases, metal pipes are naturally grounded, but if the pipe is lined with an insulating coating or made of non-metallic material, a grounding ring should be installed on both sides of the flowmeter. In areas with high external electromagnetic interference, especially when stray currents from power lines are significant, a dedicated grounding system must be implemented. This typically involves burying a copper rod or angle iron more than 0.5 meters deep in a moist area and connecting multiple copper wires with a total cross-section exceeding 4 mm² to the flowmeter’s ground terminal.
For non-metallic pipelines, a digital filtering system using imported high-precision microcontrollers, such as the Philips LPC2132 dual CPU, is employed. In the excitation field, a dual-frequency pulse excitation method with strong anti-interference capabilities is used. Signal acquisition features a three-electrode system that balances the electromotive force using a grounded electrode and liquid contact, preventing signal instability caused by unintended grounding of non-metallic pipes. Multi-layer shielding further reduces noise and spikes. By analyzing media properties and process conditions, an appropriate model can be selected, enhancing the flowmeter’s resistance to interference.
The main components of the electromagnetic flowmeter sensor include the measuring tube, excitation coil, electrodes, core, and housing. Based on the measurement principle, these devices are designed to measure the volume flow of conductive liquids and slurries in closed pipelines, including highly corrosive substances like acids, alkalis, and salts. They are suitable for harsh environments and are widely used in chemical, water supply, and wastewater treatment industries due to their high stability and precision. Their reliability and performance have made them popular among users.
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