Large-caliber electromagnetic flowmeter is widely used in water supply and drainage engineering. It can be divided into large caliber, small caliber, small caliber and small caliber according to the purpose. Medium and small caliber measuring instruments are often used in situations where fluid measurement is difficult or demanding, such as the measurement of pulp and black liquor in paper industry and pulp and coal slurry in non-ferrous metallurgy. Strong corrosive liquid in coal preparation plants and chemical enterprises, cooling water system control of blast furnace tuyere in iron and steel enterprises, flow measurement and control of coal hydraulic transportation pipe network in long-distance pipeline. Small caliber and small caliber are often used in medicine, food, bioengineering and other fields that need health.
2. Accuracy grade and function of sewage electromagnetic flowmeter
Some high-precision, multifunctional and universal EMFs on the market have very different performances. Some work with low accuracy and simple functions. The basic error of high-precision instruments is (0.5% 1% r), and that of low-precision instruments is (1.5% 2.5% fs). Price difference 12 times. Therefore, it is uneconomical and uneconomical to choose high-precision instruments that do not need high measurement accuracy (such as non-trade accounting, which only requires high reliability and good repeatability for control purposes). The error of basic information is (0.2% 0.3% r), but some different types of instruments claim to have higher accuracy due to the lack of strict equipment requirements and important reference of other conditions.
3. Liquid conductivity of sewage electromagnetic flowmeter
The use of EMF is based on the premise that the liquid to be measured must be conductive and not lower than the threshold (
4, sewage electromagnetic flowmeter flow, full flow, range and diameter.
It depends on the traffic. In the process of conveying water and other liquids with different user viscosities, the diameter of instruments selected by industrial enterprises may be different from that of pipelines. The design flow of the pipeline is generally1.53m/s electromotive force. In such a tube, the sensor diameter may be the same as the tube diameter. For fluids that are easy to adhere, accumulate and scale, the flow rate is generally not less than 2m/s, and should be increased to more than 34m/s as much as possible to play a self-cleaning role and prevent adhesion and chemical deposition. For grinding fluid, such as paper pulp, the general flow rate should be less than 23m/s to reduce the wear of lining and electrode.