The working principle of the electromagnetic flowmeter, when the conductor performs laser cutting magnetic induction wire fitness exercise in the electromagnetic field, the induced potential will be caused in the conductor. The size of the induced potential is equal to the length of the conductor in the electromagnetic field and the length of the conductor in the electromagnetic field. The rate of fitness exercise is equally proportional to the magnetic field. Similarly, conductive fluid mechanics makes vertical directional fluidity in an electromagnetic field, and laser cutting magnetic induction force lines can also cause induced potentials on the electrical levels on both sides of the pipeline. The orientation of the induced potential is determined by the right-hand rule, and the size of the induced potential is determined by the above formula.
Ex = BDv ----------------- Formula (1)
Ex-induction potential in formula, V;
B—magnetic induction strength, T
D—Inner diameter of the pipeline, m
V—average flow velocity of liquid, m / s
However, the volume flow rate 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 gives:
Qv = （πD / 4B） * Ex --------- Formula (2)
As can be seen from the above formula, when the pipe diameter D is fixed and the magnetic induction intensity B is kept constant, the measured volume flow has a linear relationship with the induced potential. If one electrode is inserted on each side of the pipe, the induced potential Ex can be introduced, and the magnitude of this potential can be measured to obtain the volume flow.
As known from the above formula, when the pipeline diameter D is fixed and the magnetic induction compressive strength B is not changed, the total volume of the measured volume is linearly related to the induced potential. If one electric level is inserted on each side of the pipeline, the induced potential Ex can be introduced, the size of this potential can be measured, and the total volume flow can be obtained.
特性 Characteristics of electromagnetic flowmeter
The instrument panel has a simple and reliable structure, can not move components, and has a long life in work. There are no trapped flow-blocking components, and no damage to working pressure and hydrodynamic obstruction can be found. No mechanical equipment inertia force, no response quickly, good reliability, can be used for automatic identification, adjustment and program control system software. The measurement accuracy will not be harmed by the type of the substance to be measured and the main parameters of the electrostatic force constant such as temperature, viscosity, relative density, and working pressure. The use of polytetrafluoroethylene or vulcanized rubber lining and the different composition of metal electrodes such as Hc and 316LTi can be incorporated into different materials. There are several types of steam flowmeter models such as pipeline type and plug type. The EEPROM memory is selected, and the measurement and operation data information storage and maintenance can be trusted. There are two forms of integration and separation. High-pixel LCD backlight displays information.
The unitary electromagnetic flowmeter is based on the Faraday basic law of electromagnetic induction and is used to measure the total volume flow of conductive fluid mechanics. Because of its distinctive characteristics, it has been widely used in the measurement of various conductive liquids in industrial production at this stage. It is suitable for chemical industry, paper industry, food industry, textiles, metallurgy industry, environmental protection, water supply and drainage and other manufacturing industries. It can maintain control systems with supporting facilities of electronic computers.
1. The electromagnetic flowmeter is a volume total flow measuring instrument panel, and it will not be harmed by the temperature, viscosity, relative density and conductivity (within a certain range) of the measured substance during the entire measurement process.
2. The electromagnetic flowmeter has no moving parts and no flow blocking parts, which is not easy to cause damage to the working pressure, and it is also not easy to cause problems such as damage and blockage.
3. The measuring range of the electromagnetic flowmeter is wide, reaching 1: 100. In addition, the electromagnetic flowmeter is only proportional to the average water flow of the measured substance, and is irrelevant to the axisymmetric flow situation (laminar flow or flow field).
4. The electromagnetic flowmeter has no inertia force of mechanical equipment, it is smart and can measure the instantaneous velocity pulsating total flow, and the line shape is good, so the measurement data signal can be immediately converted into a standardized data signal output by a converter. The LD-T type can be marked on the spot, and the LD type can be transmitted over long distances.