EF-10 Flange Type Electromagnetic Flow Meter

The measurement principle of Electromagnetic Flow Meters is based on Faraday's law of electromagnetic induction. The measuring tube of the flow meter is a non magnetic alloy short tube lined with insulating material. Two electrodes are fixed on the measuring tube through the tube wall along the diameter direction. The electrode head is basically flush with the inner surface of the lining. When the excitation coil is excited by a bidirectional square wave pulse, a working magnetic field with a magnetic flux density of B will be generated in the direction perpendicular to the axis of the measuring tube. At this point, if a fluid with a certain conductivity flows through the measuring tube, the cutting magnetic field line will induce the electromotive force E. The electromotive force E is proportional to the magnetic flux density B, and the product of the inner diameter d of the measuring tube and the average flow velocity v. The electromotive force E (flow signal) is detected by the electrode and sent to the converter through a cable. After amplifying and processing the flow signal, the converter can display the fluid flow rate and output signals such as pulses and analog currents for flow control and regulation. In the equation, k and d are constants. Since the excitation current is constant and B is also constant, it can be seen from E=KBdV that the volume flow rate Q is directly proportional to the signal voltage E, that is, the signal voltage E induced by flow rate is linearly related to the volume flow rate Q. Therefore, as long as E is measured, Q can be determined, which is the basic working principle of electromagnetic flow meters.

According to E=KBdV, the temperature of the measured fluid medium can be determined. The parameters such as density, pressure, conductivity, and liquid-solid composition ratio of the two fluid media will not affect the measurement results. As for flow

As long as the measurement state conforms to axisymmetric flow (such as laminar or turbulent flow), it will not affect the measurement results. Therefore, an electromagnetic flowmeter is a true volumetric flow rate that does not require any correction. This is a prominent advantage of electromagnetic flow meters, which is not found in any other flow meter. There are no moving or flow blocking components inside the measuring tube, so there is almost no pressure loss and high reliability.

Specification

Diameter: DN3-3000

Range: 0.2- 15m/s

Measurement Tube Material: SS304

Flange/Shell Material: carbon steel (standard), SS304/316(optional) 

Nominal Pressure: 0.6Mpa, 1.0Mpa, 1.6Mpa, 2.5Mpa, 4.OMpa, 

Higher Customization Lining: PTFE, neoprene, hard rubber, F46, PFA, polyurethane

Electrodes: SS316L, HB, HC, titanium, tantalum, platinum iridium alloy

Connection: Flange

Flange Standard: Mechanical department (standard), optional chemical department national standard, Japanese standard, American standard, German standard

Environmental Temperature: -25~+60 ℃

Power Supply: AC85-250V/DC20-36V

Output: 4-20mA, pulse, RS485 Modbus

Alarm Output: air traffic control alarm, system alarm, upper and lower limit alarm 

Connection: M20 * 1.5 (standard), 1/2 "NPT (optional)

Explosion Proof Grade: ExdlIBT6 Gb

Protection Level: IP65 (standard), IP68 (optional)

Feature

● There are no movable components or flow blocking components in the pipeline, and there is almost no additional pressure loss during measurement.

● The measurement results are independent of physical parameters such as flow velocity distribution, fluid pressure, temperature, density, viscosity, etc.

● On site, the range can be modified online according to the actual needs of the user.

● High definition backlight LCD display, full English menu operation, easy to use, easy to operate, easy to learn and understand.

● Adopting SMD devices and surface mount technology, the circuit has high reliability.

● Adopting a 16 bit embedded microprocessor, it has fast computing speed, high accuracy, programmable frequency low-frequency rectangular wave excitation, improving the stability of flow measurement and low power consumption.

● Equipped with self inspection and self diagnosis functions.

● Equipped with digital communication signal outputs such as RS485, RS232, Har t, and Modbus.

● There are three internal integrators that can display the forward cumulative quantity, reverse cumulative quantity, and difference cumulative quantity respectively. There is an internal non power-off clock that can record 16 power-off times.

● Fully digital processing, strong anti-interference ability, reliable measurement, high accuracy, flow measurement range up to 150:1 ultra-low EMI switching power supply, suitable for a wide range of power supply voltage changes, and good EMI resistance performance.

Electromagnetic Flow Meter.pdf