Electromagnetic flowmeter features and working principle
First, the working principle of electromagnetic flowmeter
When a conductor moves in a magnetic field to cut magnetic force lines, an induced potential is generated in the conductor. The magnitude of the induced potential is proportional to the medium effective length of the conductor in the magnetic field and the speed of the conductor in the magnetic field perpendicular to the direction of the magnetic field. Similarly, when the conductive fluid flows in the vertical direction in the magnetic field and cuts the magnetic induction force line, an induced potential is also generated on the electrodes on both sides of the pipe. The direction of the induced potential is determined by the right-hand rule, and the magnitude of the induced potential is determined by the following formula:
Ex=BDv ---------------- - Formula (1)
Ex - induced potential, V;
B—magnetic induction, T
D—pipe internal diameter, m
V—average flow rate of liquid, m/s
However, the volume flow qv is equal to the product of the flow velocity v of the fluid and the cross-sectional area of ​​the pipe (πD2)/4. Substituting Equation (1) into this equation yields:
Qv=(Ï€D/4B)* Ex -------- - Expression (2)
It can be seen from the above equation that when the pipe diameter D is fixed and the magnetic induction intensity B remains constant, the measured volumetric flow has a linear relationship with the induced potential. If an electrode is inserted on each side of the pipe, the induced potential Ex can be introduced and the volumetric flow can be obtained by measuring the magnitude of this potential.
Second, electromagnetic flowmeter performance characteristics
The instrument structure is simple and reliable, with no moving parts and a long working life. Without blocking flow blocking parts, there is no pressure loss and fluid blockage. No mechanical inertia, fast response, good stability, can be applied to automatic detection, adjustment and program control system. The measurement accuracy is not affected by the type of medium being measured and the physical quantity parameters such as temperature, viscosity, density, and pressure. The use of different combinations of PTFE or rubber linings and Hc , 316LTi and other electrode materials can meet the needs of different media. Pipeline, plug-in and other flow meter models are available. Using EEPROM memory, measurement and data storage protection is safe and reliable. There are two types of integration and separation. High-definition LCD backlight display.
The integrated electromagnetic flowmeter is based on Faraday's law of electromagnetic induction and is used to measure the volume flow of conductive fluids. Due to its unique characteristics, it has been widely applied to the measurement of various conductive liquids in industry. Mainly used in chemical, paper, food, textile, metallurgy, environmental protection, water supply and drainage and other industries, and computer support can achieve system control.
1. The electromagnetic flowmeter is a volumetric flow measuring instrument. It is not influenced by the temperature, viscosity, density, and conductivity of the measured medium ( in a certain range ) during the measurement process .
2. The electromagnetic flowmeter has no moving parts and no blocking parts. It will not cause pressure loss, and it will not cause problems such as wear and blockage.
3 , electromagnetic flowmeter has a wide range of up to 1 : 100 . In addition, the electromagnetic flowmeter is only proportional to the average flow velocity of the measured medium, and is independent of the axisymmetric flow state ( laminar flow or turbulent flow ) .
4. The electromagnetic flowmeter has no mechanical inertia and reacts sensitively. It can measure instantaneous pulsating flow and has good linearity. Therefore, the measurement signal can be directly converted into a standard signal output by the converter. The LD-T type can be locally indicated, and the LD type can be transmitted over long distances.
xcmg aerial work platform,xcmg aerial work platform for sale,heavy equipment platform,aerial work platform
Xinghan Muzhi Digital Technology (Xuzhou) Co., Ltd. , https://www.steelkingkong.com