High Quality Cheap Water Magnetic Flowmeter

1. Introduction

1. The MLF electromagnetic flowmeter works according to Faraday's law of electromagnetic induction and consists of a sensor and a converter. Used to measure the conductivity of liquids or solids. Under normal circumstances, its conductivity should be greater than 5μS/cm (the conductivity of tap water and raw water is about 100-500μS/cm), and it can also be used to measure acids, alkali, brine, pulp or pulp and other media. But these media cannot contain a lot of magnetic substances and bubbles.

MLF electromagnetic flowmeter is an instrument for measuring liquid fluidity. It is widely used in flow measurement in metallurgy, chemical industry, paper making, environmental protection, petroleum, textile, food, urban management, water plant and other industries.

2. Working Principle

The principle of the sensor is based on Faraday’s law of electromagnetic induction.

It is installed a pair of detection electrodes on the pipe wall,where the measurement pipe axis

and magnetic field lines are vertical. When the conductive liquid cuts magnetic field lines and

produces induced electromagnetic force.Which can be measured by the two electrodes on the

meter pipe.The result can be calculated by formula: Induced electromotive force,(flow signal)

E=KBDV

E——Induced electromotive force,V；

K——meter constant；

B——Magnetic flux density,T；

D——Internal diameter of measuring pipe,m；

V——Average velocity of pipe section,m/s.

1MLF Series Electromagnetic Flow Meter

Assume the volume of liquid as qv(m3/s),qv=πD2V/4),so in the formula E=(4kB/πD)qv=kqv,

K is meter constant,K=4kB/πD.

Actually, the electromagnetic flow meter consists of two parts, transmitter and sensor, the

measuring electrodes inspect the electromotive force, and transmit to the converter, the

converter provides excitation current.

E is usually called a flow signal, after processing the flow signal by converter, output 4~20 mA/

pulse(or frequency) signal which is proportional to the flow rate, then the flow rate recording,

adjusting can be achieved.

3. Quick Details

• MLF electromagnetic flowmeter is explosion-proof design.
• Function of low conductivity measurement.
• There are nine language options to meet the needs of different customers.
• It has the function of self-regulation and self-examination.
• Different outputs are optional: Hart,RS485 Profibus,4-20mA, frequency, pulse.

4. Selection of Liner Material

5. Selection of Electrode Materials

6. Dimensional Sketches

a. Dimension of Converter

Divided Type

Integrated Type

Battery Powered Type

b. Dimension of Sensor

7. Instrument Testing & Maintenance

The electromagnetic Flowmeter has the function of self-diagnosis.In addition to power supply and hardware circuit failures, the system also gives an alarm to other faults in general use.These messages are prompted in the lower right corner of the screen.

1 Maintenance and repair.

A) the sensor installation site should meet the requirements of Section 4, please keep the shell clean and tidy.

B) the transmitter should be placed in a clean, ventilated and dry place.

C) it needs to be checked every two years, and for high-precision users, the instrument needs to be submitted for review.

2 Transportation and storage.

A) the equipment must be packed before transportation and handled carefully during loading and unloading.

B) the storage place must be dry and ventilated to avoid the erosion of corrosive gases and the ambient temperature should not be too low or too high.

C) the storage time should not exceed three years.

3. Out-of-the-box inspection.

A) the package cannot be opened with a heavy hammer, be careful not to damage the instrument.

B) carefully check the contents according to the packing list.