EMF Flange Integrated Type Electromagnetic Flow Meters
1. Introduction
MLF electromagnetic Flowmeter works according to Faraday's law of
electromagnetic induction and is composed of sensors and
converters. Used to measure the electrical conductivity of liquids
or solids. In general, its electrical conductivity should be
greater than 5 μ S / cm (the electrical conductivity of tap water
and raw water is about 100 ~ 500 μS / cm), can also be used to
measure various media such as acid, alkali, salt water, pulp or
pulp. But these media cannot contain large amounts of magnetic
materials 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, waterworks 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. Features
MLF electromagnetic Flowmeter is explosion-proof design.
function of low conductivity measurement.
There are 9 language options to meet the needs of different
customers.
Have self-regulation function and self-examination.
different outputs are optional: hart, RS485 Profibus ,4-20 mA,
frequency, pulse.
4. Specification
| MLF Type | Divided Type | Integrated Type | Explosive Proof Integrated Type | Battery Powered Type | Heat Energy Type |
| Accuracy | ±0.2% or ±0.5% |
| Pipeline Diameter | DN10-DN2000 | DN10-DN600 | DN25-DN2000 |
| Flange | GB, ANSI, JIS, BS, Others |
| Pressure | DN10-DN600 1.0 1.6 2.5 4.0MPa |
| DN700-DN2000 0.6 1.0 1.6MPa |
| Liner Material | CR, PTFE, PU, Hard Rubber, PFA, FEP(F46) |
| Conductivity | ≥5µs/cm(Please contact us if it is less than 5µs/cm) |
| Electrode | 316L SS, Hb, Ta, Ti, Hc, Tungsten Carbide, Others |
| Protection Class | IP65, IP66, IP67, IP68 |
| Medium Temperature | -25~180℃
(Please refer to liner material) | -25~80℃(Please refer to liner material) | -25~180℃
(Please refer to liner material) |
| Ambient Temperature for Accuracy Influence | <±0.1%/10℃ or <±0.25%/10℃ at the ambient temperature of -25~60℃ |
| Repetability | ≤±0.1% or ±0.25% |
| Analog Output Error | ≤±0.02mA |
| Velocity | 0.3~10m/s |
| Electrical connection | M20x1.5 Seal Cartridge, GB1/2, NPT1/2 |
| Output | 4-20mA, Pulse, RS485, Hart, Profibus |
5. Selection of Liner Material
| Liner Material | Main Performance | Application |
| PTFE | 1 It has the most stable chemical properties in plastics, resistant
to boiling hydrogen chloride and sulfuric acid, nitric acid, aqua
regia, strong alkali and various organic solvents, but not
resistant to chlorine trifluoride, high temperature nitrogen
trifluoride, liquid fluorine, and liquid oxygen And ozone
corrosion. 2 Low wear resistance. 3 Low negative pressure resistance. | 1. -25~140℃ 2. Strong corrosion medium, like strong acid and alkali 3. Healthcare medium |
| CR | Oil proof, solvent resistance, oxidatite resistance and the
resistance to the erosion of common medium like acid, alkali, salt,
etc. | 1. ＜80℃ 2. Be able to measure sewage and mud |
| PU | 1. Very good abrasive resistance, flexibility. 2. Low acid and alkali resistance. | 1. ＜65℃ 2. Neutral strong abrasion resistance medium |
| Hard Rubber | 1 Room temperature, hydrochloric acid, acetic acid, oxalic acid,
ammonia, phosphoric acid and 50% sulfuric acid, sodium hydroxide,
potassium hydroxide 2 Avoid strong oxidizing agents | 1. ＜80℃ 2. General acid, alkali, salt solution |
| PFA | 1. Can be used for most corrosive medium like acides, alkalis, and
strong oxidant. 2. High material strength, resistance to aging, better than PTFE,
EFP in high temperature 3. Injection molding for higher negative pressure | 1. 40~180℃ 2. Strong corrosion medium, like strong acid and alkali 3. Healthcare mdium |
| FEP(F46) | 1. Hydrophobicity and non-viscous 2. Corrosion resistance is inferior to PFA 3. Negative pressure | 1. 40~180℃ 2. Strong corrosion medium, like strong acid and alkali 3. Healthcare mdium |
6. Selection of Electrode Materials
| Electrode Material | Main Performance |
| 316L | Good corrosion resistance of nitric acid, at room temperature
<5% sulfuric acid, acetic acid, alkaline liquid, a certain
pressure of sulphate, seawater, acetic acid and other corrosion,
can be widely used in petrochemical urea, veline and so on. |
| Hb | Good resistance to all concentrations of hydrochloric acid below
boiling point, as well as non-oxidizing acid, alkali, sulfuric
acid, phosphoric acid, hydrofluoric acid and organic acid. |
| Hc | Resistance to the corrosion of oxidizing acids like metric acid,
mixed acid. The mixture of chromium acid and sulfuric acid, and
salts of oxidative, like Fe3+, Q3+, and some other oxidants, like
hypochlorite salt solution higher than normal tmperature and
seawater. |
| Ti | Corrosion resistance of oxidizing acids, such as nitric acid and
mixed acid. A mixture of chromic acid and sulfuric acid, oxides,
such as Fe3+,Q3+, and other oxidants, such as a mixture of
hypochlorite solution above normal temperature and seawater. |
| Ta | Good corrosion resistance similar to glass. Resistance to the
corrosion of chemical medium(including hydrochloric acid and
fumiing sulfuric acid), but can not be used for sodium hydromide
fluid. |
| Pt-Ir | Have good corrosion resistance of all acid, and can be resistance
to the corrosion of alkali, all salt except aqua regia, ammonium
slat and few other medium |
| Tungsten Carbide | For pulp and sewage, good resistance to solid particle
interference. |
7. Dimensional Sketches
a. Dimension of Converter
Divided Type
Integrated Type
Battery Powered Type
b. Dimension of Sensor
| Pipeline Diameter | Dimension |
| L | W | H |
| 15 | 160 | 95 | 130 |
| 20 | 160 | 105 | 137 |
| 25 | 160 | 115 | 150 |
| 32 | 160 | 135 | 160 |
| 40 | 200 | 145 | 175 |
| 50 | 200 | 160 | 185 |
| 65 | 200 | 180 | 205 |
| 80 | 200 | 195 | 215 |
| 100 | 250 | 215 | 235 |
| 125 | 250 | 245 | 275 |
| 150 | 300 | 280 | 300 |
| 200 | 350 | 335 | 355 |
| 250 | 400 | 400 | 405 |
| 300 | 500 | 455 | 460 |
| 350 | 500 | 515 | 520 |
| 400 | 600 | 575 | 580 |
| 450 | 600 | 635 | 630 |
| 500 | 600 | 710 | 685 |
| 600 | 600 | 835 | 795 |
| 700 | 700 | 905 | 910 |
| 800 | 800 | 1020 | 1030 |
| 900 | 900 | 1120 | 1120 |
| 1000 | 1000 | 1245 | 1250 |
| 1200 | 1200 | 1465 | 1470 |
