Active Member
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[China]
Address: No.21, Lane 697, Guangfulin Road, Songjiang District, Shanghai, China
Contact name:Nancy Zhao
Melan Measurement & Control Instruments (Shanghai) Co.,Ltd. |
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MLF Series Electromagnetic Flow Meter Designed for Measurement of Conductive Liquids
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. 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.
3. 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 | ||||
4. 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 |
5. 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. |
6. 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 |
7. Instrument testing and maintenance
Electromagnetic Flowmeter has self-diagnosis function. In addition to power and hardware circuit failures, the system also alarm other faults in general use. The information is prompted in the lower right corner of the screen.
1. Maintenance and repair
a) sensor installation site should meet the requirements of Section 4, please keep the shell clean;
b) transmitters shall be placed in a clean, ventilated, dry place;
c) need to be checked every two years, for high-precision users, the instrument needs to be submitted for review.
2. Transport and storage
a) instruments must be packed before transportation, loading and unloading should be carefully light.
b) storage place must be dry, ventilated, avoid corrosive gas erosion, environmental temperature should not be too low or too high;
c) storage time should not exceed three years.
3. Open-box inspection
a) packing must not be opened with a heavy hammer, be careful not to damage the instrument
b) carefully check the contents according to the packing list.
