Some Tips and Precautions for Electromagnetic Flow Meters

Abstract: Some tips and precautions for electromagnetic flowmeters are provided by excellent flowmeter and flowmeter manufacturers. Abstract: In this paper, combined with the author's personal experience, this paper introduces in detail some skills and precautions that the electromagnetic flowmeter should have in its selection. 1. Introduction Electromagnetic flowmeter (EMF for short) is a kind of measurement conductivity made by Faraday's law of electromagnetic induction. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are some tips and precautions for electromagnetic flowmeters. Combined with the author's personal experience, this paper introduces in detail some skills and precautions that electromagnetic flowmeter should have in its selection. 1. Introduction Electromagnetic flowmeter (EMF for short) is an instrument made by Faraday's law of electromagnetic induction to measure the volume flow of conductive liquids. In the early 1950s, EMF realized industrial application. In recent years, the output of EMF accounts for about 5% to 6.5% of the total number of industrial flow meters in the world. Especially since 2000, this value has been increasing year by year. As a kind of industrial flow measuring instrument, electromagnetic flowmeter has some skills and precautions in its selection. I will discuss with you some personal experience here, hoping to contribute to the correct selection of electromagnetic flowmeter. 2. Electromagnetic flowmeter selection 2.1 Application overview Electromagnetic flowmeter has a wide range of applications. According to the application, there are large diameter, medium and small diameter, small diameter and small diameter. Among them, large-diameter electromagnetic flowmeters are mostly used in water supply and drainage projects. Paper pulp and black liquor in paper industry, ore pulp in non-ferrous metallurgy industry, coal slurry in coal preparation plant, strong corrosive liquid in chemical industry, cooling water control of blast furnace tuyere in iron and steel industry, flow measurement and control of hydraulic transportation of coal in long-distance pipelines, etc. Small-caliber and micro-caliber are often used in places with hygienic requirements such as the pharmaceutical industry, food industry, and bioengineering. 2.2 Accuracy level and function The performance of general-purpose EMFs on the market is quite different. Some have high precision and many functions, and some have low precision and simple functions. The basic error of the instrument with high precision is (±0.5%～±1%) R, the instrument with low accuracy is (±1.5%～±2.5%) FS, the price difference between the two is 1 to 2 times. Therefore, it is not economical to use high-precision instruments in places where the measurement accuracy is not very high (for example, non-trade accounting is only for control purposes, and only requires high reliability and excellent repeatability). Some models of meters claim higher accuracy, with a fundamental error of only (±0.2%～±0.3%) R, but there are strict installation requirements and reference conditions, such as the ambient temperature of 20 ~ 22 ℃, the length of the front and rear straight pipe sections is required to be 10D and 3D (usually 5D and 2D) respectively. The tube is integrated to perform real flow calibration on the flow standard device to reduce the effect of clamping. Therefore, when comparing multiple models, don't just look at the high indicators, but read the manufacturer's samples or instructions in detail for a comprehensive analysis. The functions of EMFs on the market are also very different. The simple one is to measure one-way flow, and only output analog signals to drive the rear instrument; , small signal removal, flow display and total calculation, automatic check and fault self-diagnosis, communication with the host computer and motion configuration, etc. The serial digital communication function of some models of instruments can choose a variety of communication interfaces and special-purpose chips (ASIC) to connect HART protocol systems, PROFTBUS, Modbus, CONFIG, FF fieldbus, etc. 2.3 Flow rate, full-scale flow, range and caliber The diameter of the selected instrument is not necessarily the same as the pipe diameter, and should be determined according to the flow rate. The process industry transports liquids with different viscosities such as water, and the pipeline flow rate is generally an economical flow rate of 1.5 to 3m/s. EMF is used on such pipes, and the sensor diameter is the same as the pipe diameter. When the EMF flow rate is full, the liquid flow rate can be selected in the range of 1 ~ 10m/s, and the range is relatively wide. The upper limit flow velocity is not limited in principle, however, it is generally recommended not to exceed 5m/s, unless the lining material can withstand the flow of liquid, and practical applications rarely exceed 7m/s, and more rarely exceed 10m/s. The lower limit of the full-scale flow rate is generally 1m/s, and some models of instruments are 0.5m/s. Some new projects have low flow rate or low flow rate in the early stage of operation. Considering the measurement accuracy, the diameter of the instrument should be changed to be smaller than the diameter of the pipe, and connected with a reducer.
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