Non-full pipe flow meters mag flow meter

Non-full tube Electromagnetic Flowmeter is composed of a flow rate sensor, a water level sensor and a flow display instrument, continuously measuring the fluid flow rate and liquid level in the pipeline,As long as the user inputs the diameter of a circular pipe or the width of a square pipe, the non-full pipe flowmeter will automatically calculate the flow in the pipeline, and automatically display the instantaneous flow, flow rate, cumulative flow and other measurement parameters.

I. Working principle of  electromagnetic flowmeter with non-full tube

According to Faraday's law of electromagnetic induction, a pair of detection electrodes are installed on the wall of the tube perpendicular to the axis of the measuring tube and the magnetic force line. When the conductive liquid moves along the axis of the measuring tube, the conductive liquid cuts the magnetic force line to generate the induced potential, which is detected by the two detection electrodes. The value is directly proportional to the flow rate and its value is: E=KBVD

Where:

E-induced potential

K- coefficient related to magnetic field distribution and axial length

B- magnetic induction intensity

V- average velocity of conducting liquid

D- electrode spacing (Measuring tube diameter)

The sensor takes the induced potential E as the flow signal and transmits it to the converter. After a series of digital processing through amplification, transformation and filtering, and after serial digital processing, the instantaneous flow and cumulative flow are displayed by dot matrix LCD with backlight.

The Converter has 4 ~ 20mA output, alarm output and frequency output, and has RS485 communication interface, and supports HART and MODBUS protocol.

Ⅱ.Advantages of non-full tube flowmeter

1. Can be used for open pipe flow measurement;

2. Can be used in municipal rainwater, wastewater, sewage discharge and irrigation water pipes and other places of continuous measurement;

3. Can realize forward and reverse bidirectional flow measurement;

4. The sensor can work in bad ambient spots and sewage water quality for a long time;

5. High flow measurement accuracy, not affected by downstream, tributary congestion, choke and other factors;

6. The straight pipe section of the measuring pipe shall be 10 times the diameter of the pipe;

7. Backlight liquid crystal display, whether in high light or at night , measurement data can be clearly read;

8. Full display and output function of the non-full tube flowmeter, can display instantaneous flow, flow rate, cumulative flow and other data, and has 232, 485 computer communication interface (optional parts);

Ⅲ. The main technical performance index of non-full tube flowmeter

Nominal diameter: circular pipeline DN200-DN1000mm; Rectangular pipeline: width ≤6m

Measuring accuracy: water level ±2mm;

Flow velocity ± 1.0%; Flow ± 2.5%

Measuring range: Flow velocity 0.05~10m/s

Conductivity of measured medium: ≥20s/cm

Temperature of measured medium: ≤60℃

Large screen, LCD backlight  display, can simultaneously display instantaneous flow, flow velocity, accumulative flow and other measurement data.

Current output signal: 4~20mA/DC(load resistance ≤500Ω)

Pulse output signal: 1~2000Hz

Digital communication interface: Rs232, RS485 Optional

Wireless remote data transmission: GSM and GPRS are optional

Power supply: AC220V, DC12V, DC24V

Ⅳ. Application characteristics of  electromagnetic flowmeter with non-full tube

It can be used to measure the total flow of open non-full pipe (round steel pipe, rectangular square pipe or other special shaped pipe);

It can be used for continuous measurement of municipal engineering precipitation, sewage, industrial waste water and irrigation pipelines, and other sites.