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1. What is an electromagnetic flowmeter? Electromagnetic flowmeter (EMF) is an instrument made using Faradays law of electromagnetic induction to measure the volumetric flow rate of conductive liquids. In the early 1950s, electromagnetic flowmeter (EMF) achieved industrial application, and in the late 1970s, the key controlled low-frequency rectangular wave excitation method emerged, gradually replacing the early application of power frequency AC excitation method. The instruments function has made great progress and has been widely used. In recent years, the development speed has been rapid, with an estimated global production volume of over 200000 units in 2005. At present, large-diameter electromagnetic flowmeters are widely used in water supply and drainage engineering, while small and medium-sized flowmeters are commonly used for difficult to measure solid-liquid two-phase fluids or high demand places. Such as measuring pulp and black liquor in the papermaking industry, slurry in the non-ferrous metallurgy industry, coal slurry in coal preparation plants, strong corrosive liquids in the chemical industry, and controlling and monitoring cooling water leakage in blast furnace tuyere in the steel industry, as well as measuring and controlling the flow rate of hydraulic coal transportation in long-distance pipelines. Small caliber and micro caliber electromagnetic flowmeters are commonly used in places with hygiene requirements such as the pharmaceutical industry, food industry, and biotechnology. The intelligent electromagnetic flowmeter is based on Faradays law of electromagnetic induction and is used to measure the volumetric flow rate of conductive liquids with a conductivity greater than 5 μ S/cm. It is an indu
2. What is the coil voltage included in the electromagnetic flow?
The excitation coil voltage of an electromagnetic flowmeter is usually in the range of 5-50V, and the specific value depends on the instrument model, caliber size, and manufacturer design.
. 1. The working voltage of the excitation coil of electromagnetic flow meters with different diameters and models varies in common voltage ranges: - Small caliber instruments (DN10-DN50): commonly used 5-15V low-voltage excitation - Medium and large caliber instruments (DN65-DN1200) are lacking: mostly use 15-30V standard voltage - Extra large caliber or special applications (DN1400 or above): may require a higher voltage of 30-50V. 2. Influencing factors The specific value of excitation voltage is mainly affected by three factors: • Measuring tube diameter: the larger the diameter, the higher the required magnetic field strength, and the corresponding voltage increase. • Excitation methods: DC excitation, power frequency excitation, low-frequency rectangular wave excitation, etc. Different voltage requirements vary. • Manufacturer design: There ar
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