In the selection of sewage flow meter scale analysis

Abstract: the selection of sewage flow meter scale analysis information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. At present, each big enterprise sewage metering, pipeline sewage measurement using sewage flow meter widely used electromagnetic flowmeter, sewage flow in open channel measurement using the ultrasonic open channel flow meter. Electromagnetic flowmeter application has more than 50 years of history, has been in the global scope. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a selection analysis the details of the sewage flow meter scale. At present, each big enterprise sewage metering, pipeline sewage measurement using sewage flow meter widely used electromagnetic flowmeter, sewage flow in open channel measurement using the ultrasonic open channel flow meter. 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. 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. 1 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. If the magnetic field strength for B, metal rod of length L, speed v, so the induction voltage: ( See image below) The work theory drawing in electromagnetic flowmeter, electromagnetic flowmeter measurement 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. Assume that electromagnetic induction coil magnetic field intensity ( B） As the constant, the induced voltage ( Ue） Is proportional to the fluid velocity ( v） , the pipe sectional area ( 一) As known, the volume flow ( Qv） Can be calculated by the following formula: electromagnetic flowmeter consists of flow sensor and transmitter of two parts. 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, hengrui instrument companies provide W, P, H, three types of sensor respectively applied in water and wastewater industry ( W) , chemical industry, food industry, P type) , food, pharmaceutical industry ( H) , diameter ranges from 6 mm to 2 m. 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) 。

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