The electromagnetic flow sensor is based on Faraday's law of electromagnetic induction. Intelligent electromagnetic flowmeters are used to measure the volumetric flow of conductive liquids and slurry liquids and slurries in closed conduits. When the conductive fluid passes through the sensor measuring tube, a voltage signal proportional to the average flow velocity of the fluid will be applied to the electrode.
The signal is processed by the converter and outputs 4-20m.A.DC current signal and 0-5kHz pulse signal. The converter can also display instantaneous flow and accumulated flow and upper and lower limit alarm RS45 communication. The electromagnetic flow sensor is mainly composed of a lining insulating material measuring tube, a pair of electrodes installed through the wall of the measuring tube, and a pair of coils and iron cores for generating a magnetic field.
The main functions of the electromagnetic flowmeter flow sensor consisting of the outer casing, the magnetic circuit system, the measuring tube, the lining and the electrode are as follows:
(1) The outer casing. Made of ferromagnetic material to protect the excitation coil and isolate the interference from external magnetic fields.
(2) Magnetic circuit system. A uniform DC or AC magnetic field is generated, and the DC magnetic field can be realized by a permanent magnet. The structure is simple, and an industrial field electromagnetic flowmeter generally adopts an alternating magnetic field.
(3) Measuring tube. Flow through the fluid to be measured, flanges at both ends, used as connecting pipes. The measuring tube is made of a material that is non-magnetic, low in electrical conductivity, low in thermal conductivity, and has a certain mechanical strength. Generally, stainless steel, glass reinforced plastic, aluminum, and other high-strength materials are available.
(4) Lining. Increase the wear resistance and corrosion resistance of the measuring tube to prevent the induced potential from being short-circuited by the metal measuring tube wall. There is a layer of wear-resistant, corrosion-resistant and high-temperature resistant insulation on the inner wall of the measuring tube.
(5) Electrode. The correct inductive potential signal is made of stainless steel non-magnetic material and needs to be flush with the lining during installation.
The characteristics of the electromagnetic flowmeter sensor can also output 4~20mA current signal for recording, adjustment and control while meeting the on-site display. It has been widely used in chemical, environmental protection, metallurgy, medicine, papermaking, water supply and drainage and other industrial technologies. And management. Nanjing Ruipai Instrument Co., Ltd. http://.
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