The long history of wastewater discharge application of electromagnetic flow meter scale

Abstract: the long history of wastewater discharge application of electromagnetic flow meter scale information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Electromagnetic flowmeter application has more than 50 years of history, has been widely used in the global scope, field water/sewage, chemical, pharmaceutical, paper making, food and other industries. Large diameter instrument is more applied in water supply and drainage engineering. Small and medium caliber is often used for solid liquid. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the long history of wastewater discharge application of electromagnetic flow meter scale article details. Electromagnetic flowmeter application has more than 50 years of history, has been widely used in the global scope, field water/sewage, chemical, pharmaceutical, paper making, food and other industries. Large diameter instrument is more applied in water supply and drainage engineering. Small and medium caliber is often used in solid-liquid two equal several fluid or high demand. Small diameter, small diameter is often used in the pharmaceutical industry, food industry, biological engineering, etc have health requirements. Kaifeng instrument manufacturer is numerous, the source of high qualification zui old technology zui enterprise. With the acceleration of China's industrialization, environmental pollution is increasingly serious, society of sustainable development is becoming more and more high, the concept of harmonious coexistence between man and nature to accept by people, to all sorts of pollution of more urgent. The working principle of electromagnetic flowmeter measurement principle is based on Faraday's law of electromagnetic induction. When the conductive metal rod with a certain speed in vertical direction of the magnetic field lines exercise, the induced voltage is produced. In the electromagnetic flowmeter, the measuring tube conductive medium is equivalent to conducting metal rods in the Faraday experiment, up and down at the ends of the two electromagnetic coils generate constant magnetic field. When conducting medium flows, the induced voltage is produced. The inside of the pipe induced voltage produced two electrodes are measured. Measuring pipeline through non-conductive lining ( Rubber, teflon, etc. ) With fluid and measuring electrode electromagnetic isolation. Assumes that the electromagnetic induction coil produces magnetic field strength B is constant, the induced voltage Ue is proportional to fluid velocity v, pipeline cross-sectional area A is known, the volume flow Qv can be calculated by the following formula: electromagnetic flowmeter is made up of two most flow sensor and transmitter. Sensor tube fitted with excitation coil, excitation current to produce magnetic field through the measuring tube, a pair of electrodes in measuring tube wall in contact with the liquid phase, which leads to the induction electric potential, sent to the transmitter. The excitation current was provided by the transmitter. Classification in the converter and the sensor assembly way, has two kinds of separation type and size. In the sewage treatment technology of large diameter flowmeter are separation, part is installed on the ground, the other part on the ground. Small diameter with one-piece. The function of electromagnetic flowmeter has a very big difference on the market, simple just measure the one-way traffic, only after output analog signal to drive an instrument; Multifunctional instrument with two-way flow measuring, switch range, upper and lower flow alarm, air traffic control and the power cut off alarm, cut of small signal, flow display and volume, automatic check and fault self-diagnosis, communicate with PC and motion configuration, etc. Some models of instrument serial digital communication function can choose a variety of communication interface and dedicated chip ( ASIC) To connect the HART protocol system, PROFTBUS, Modbus, FF fieldbus, etc. Electromagnetic flow meter diameter range than other varieties of flow meters wide, W, P, H, E + H company three types of sensors, respectively applied in water and wastewater industry ( W) , chemical industry, food industry, P type) , food, pharmaceutical industry ( H) And diameter range from 2 mm to 2 m. Transmitter can provide 10, 50, 23, 53, a variety of choices, 10 for water industry the development of economy, 50 as normal, 53 is enhanced, 23 for two wire system. Precision can be 0. 5%, 0. 2% of two options. Measurable positive and negative two-way flow, pulsating flow rate can be obtained. Using electromagnetic flowmeter is the premise of measured liquid must be conductive and not lower than the threshold ( The lower limit value) 。 Electrical conductivity is lower than the threshold will produce measurement error until you can't use, even change can be measured more than threshold, little change of error of indication, universal threshold in 10 - electromagnetic flowmeter The 4 ~ ( 5× 10 - 6) S/cm between, depending on the model. When using also depends on sensors and switches between flow line length and its distributed capacitance, usually in factory operating instructions conductivity signal corresponding to the length. Industrial water and its aqueous solution, the electrical conductivity of more than 10 - 4 s/cm, acid, alkali, salt solution conductivity in 10 - 4 ~ 10 - 1 s/cm between, use there is no problem, low-alcohol distilled water for 10 - 5 s/cm is no problem. Electromagnetic flowmeter can measure very low conductivity of liquid, such as oil products and organic solvents etc. Not measuring gas, steam and liquid containing more bigger bubbles.

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