The working principle of electromagnetic flowmeter:
Electromagnetic flowmeter measurement principle is based on Faraday's law of electromagnetic induction. Flowmeter measurement tube is a lining insulation of permeability alloys short tube. Two electrodes along diameter direction through the wall on the measuring tube. The electrode head and basic flush lining the inner surface. The bi-directional square wave pulse excitation coil excitation, will be in a direction perpendicular to the axis measuring tube to produce a magnetic flux density for day work.
At this point, if a certain electrical conductivity of the fluid flowing through the measuring tube. Will cut magnetic induction electromotive force E. Electromotive force E is proportional to the magnetic flux density B, sounding pipe diameter d, and v is the product of the average flow. Electromotive force E (traffic signal) by the detection electrode and through the cable to the converter. Converter will flow signal amplification processing, can display the fluid flow, and can output pulse, analog signals, such as current used for flow control and regulation.
Electromagnetic flowmeter product features:
1 have no moving parts, and the pipe unimpeded flow components, almost no additional pressure loss in the measurement.
2, measuring results and the velocity distribution, the fluid pressure, temperature, density, viscosity and other physical parameters.
3, on the spot can be on-line modification range according to user's actual needs.
4, high definition backlit LCD display, full Chinese menu operation, easy to use, simple operation, easy to understand.
5, adopt SMD components and surface mount technology (SMT), circuit has high reliability.
6, using 16 bits embedded microcontroller processor, operation speed, high precision, programmable frequency low-frequency rectangular wave excitation, improve the stability of the flow measurement, low power consumption.
7, all digital processing, strong anti-interference ability, reliable measurement, high accuracy, the flow measurement range of up to 150:1.
8, low EMI switching power supply, it is suitable for the power supply voltage variation range is big, the EMC performance is good.
9, inside has three integrator can reverse the cumulative amount respectively show positive cumulative integrating quantity, and the difference with internal out electric clocks, can record 16 times time when power supply drop.
10, with RS485 and RS232, Hart and Modbus digital communication signal output.
11, with functions of self-check and from theory.
