Electromagnetic Flow meter
Working Principle
Working principle of electromagnetic flow meter measurement is based on the Faraday law of electromagnetic induction. Measurements of the flow meter tube is lined with insulating material of a non-magnetic alloy spool. Two clicks along the diameter through-wall fixing on the measuring tube. The electrode head is flush with the lining inner surface. Field coil by waves when pulsed excitation by both parties, will be measured perpendicular
to the pipe axis direction produces a magnetic flux density of the magnetic field b. At this point, if you have
some electrical conductivity of fluid flows through the measuring tube, cut magnetic lines of induction electromotive force.
Electromotive force e is proportional to the magnetic flux density B, measure the inside diameter d and the product of the mean velocity v. Electromotive force e (traffic signal) checked out by electrodes and cables to the converter. Converter after the traffic signal will be amplified, to display fluid flow and energy output pulse, analog current signals for flow control and the flow adjustment.
E=KBdv Type: E-- for signal voltage between the electrodes (v)
B-- magnetic flux density (t)
d-- measuring tube diameter (m)
v-- average flow velocity (m/s)
K, d is a constant, due to magnetizing current is constant, b is constant, the E=KBdv, is proportional to the
signal voltage and volumetric flow Q E-. And volume flow rate sensor signal voltage e Q into a linear relationship. Therefore, as long as the measure to determine the flow rate Q, this is the basic operating principle of electromagnetic flowmeter. By E=KBdv today, the measured flow of medium temperature, density, pressure, conductivity, liquid-solid two phase media of liquid and solid ingredients than parameter does not affect the measurement results.
As for the axisymmetric flow flow state as long as it meets (such as laminar or eddying flow) does not affect the measurement results. Thus volume flowmeter Electromagnetic Flowmeter is a real. For manufacturers and users alike, just use plain water after the actual calibration of measuring volume flow of the fluid any other to the point, without the need for human and remediation. This is electromagnetic flowmeter to highlight advantages, is not found in any other flow meters. Measuring tube and block parts of inactivity. So there is little pressure loss and extremely high reliability.
Features:
1.No moving and blocked flow parts in the pipeline, almost no additional pressure loss in the measurement.
2.Measurements results are independent of physical parameters, such as flow distribution, fluid pressure, temperature, density and viscosity.
3.On-site modification of the measuring range available.
4.LCD display, easy to use and simple to operate.
5.Using SMD devices and SMT technology.
6.Using 16-bit embedded processors with fast speed and high accuracy, enhancing the stability of measurement.
7.Anti-interference, reliability, measurement range up to 150:1.
8.Ultra low EMI switch, wide range of power supply voltage.
9.RS485, RS232, Hart and Modbus digital communication signal output.
10.Self-checking function.
Technical parameters:
Nominal diameter DN(mm) |
10, 15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500, 600,800, 1200 Note: special specifications can be customized |
Flow direction |
positive and negative, net flows |
Measuring range ratio |
150:1 |
Repeatability error |
±0.1% |
Accuracy |
Pipe type: 0.5, 1.0 |
Measured medium temperature |
Common rubber lining: -20~+60 ºC High temperature rubber lining: -20~+90 ºC PTFE lining: -30~+100 ºC High temperature vinyl lining: -30~+180 ºC |
Rated working pressure |
Pipe type: DN10~DN65: ≤ 2.5MPa; DN80~DN150: ≤ 1.6MPa; DN200~DN1200: ≤ 1.0MPa Special type up to 10.0MPa |
Flow measuring range |
flow measuring range corresponding to flow rate range is 0.3~15m/s |
Measured fluid conductivity |
≥5μs/cm (Most with water as the composition of the medium, its conductivity in the range 200~800 Mu s/cm, optional solenoid flow) |
Output |
4~20mADC (isolation), pulse frequency 0~1kHz, OCT photoelectric isolation, external power ≤ 35VDC, breakover, collector Max 25mA |
Load resistance |
< 600 Ω |
Electrode material |
316L, titanium(Ti), tantalum(Ta), Hastelloy(H), Platinum(Pt) or other special electrode materials |
Protection grade |
Standard: IP65; Diving type:IP68 |
Working power supply |
85~265VAC 45~63HZ |
Straight pipe length |
Pipe type: ≥ 5DN in the upper reaches, downstream :≥2DN |
Connections |
flow meter connected to the piping is used between flanges, flange connection dimensions comply with GB9119-88 requirements. |
Explosion-proof mark |
ExdIICT6 |
environment temperature |
-25 ºC ~+60 ºC |
Relative humidity |
5%~95% |
Total power consumption |
<20W |
Company Profile
Sichuan VACORDA Instruments Manufacturing Co., Ltd.is a professional production- manufacturing enterprise specialized in designing, producing and marketing of instruments and apparatuses. Our company has been established for 22 years since 1997 to grow up to be a team of high-quality, united, hard-working and truth-seeking characters. Solid foundation has been established.
In 2017, we moved into our new factory which occupies the area about 20000 square meters, the workshop of 6900 square meters, R&D department of 1180 square meters, integrated office building of 1260 square meters, and we have established the high accuracy flow calibration lines.
Products Application
Our products are widely successfully used in steel, metallurgy, petroleum, chemicals, machinery, food, light industry and other industries in the production process and control, some products have been repeatedly supporting exports.
Certifications