Electromagnetic Flow Meter Designed for Measurement of Conductive
Liquids
1. Introduction
MLF electromagnetic flowmeter is based on Faraday's law of
electromagnetic induction and consists of sensors and converters.
Used to measure the conductivity of a liquid or solid. Generally,
its conductivity should be greater than 5μS/cm (the conductivity of
tap water, raw water is about 100~500μS/cm). it can also be used to
measure various media such as acid, alkali, brine, pulp or pulp and
other medium. But these medium can not contain a large number of
magnetic substances and bubbles.
MLF electromagnetic flowmeter is an instrument to measure liquid
fluidity. Widely used in metallurgy, chemical, paper, environmental
protection, petroleum, textile, food, urban management, water
plants and other industries of flow measurement.
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. 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. 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 |
6. Configuration
| MLF Series Electromagnetic Flow Meter Configuration |
| Model | MLF |
| Sensor Installation | S | Flange Type Sensor |
| C | Insertion Type Sensor |
| O | Others |
| Pipeline Diameter | 10 | 10mm |
| 15 | 15mm |
| 20 | 20mm |
| ...... | |
| 2000 | 2000mm |
| Electrode Installation | F | Standard Fixed Type |
| Electrode Material | A | 316L SS |
| B | Hb |
| C | Ta |
| D | Ti |
| E | Hc |
| F | Tungsten Carbide |
| G | Others |
| Liner Material | R | Rubber |
| P | PTFE |
| O | Others |
| Pipe Material | B | 304 SS (Standard) |
| C | 316 SS |
| Flange Type | G | GB (Standard) |
| A | ANSI |
| J | JIS |
| B | BS |
| O | Others | |
| Flange Material | A | 304 SS |
| B | 316 SS |
| C | #20 Carbon Steel (Standard) |
| Cover Material | D | 304 SS |
| E | 316 SS |
| F | Carbon Steel+ Epoxy Metallic Paint (Standard) |
| Matching Flange | 0 | Without Matching Flange (Standard) |
| 1 | With Matching Flange |
| Ground Ring | 0 | Without Ground Ring (Standard) |
| 1 | With Ground Ring |
| Rated Pressure | 10 | 1.0MPa |
| 16 | 1.6MPa |
| 25 | 2.5MPa | |
| 40 | 4.0MPa |
| Working Temperature | E | ≤60℃ |
| H | ≤180℃(Divided Type) |
| Type | I | Integrated Type |
| D | Divided Type |
| Output | P | Pulse |
| A | 4-20mA |
| G | RS485 |
| H | Hart |
| Q | Others |
| Power Supply | 0 | 220VAC |
| 1 | 24VDC |
| 2 | Battery-powered |
| Protection Class | 0 | IP65 (Integrated/Divided Type) |
| 1 | IP67 (Divided Type) |
| 2 | IP68 (Divided Type) |
| Other Features | R | Heat Energy Function |
| P | With PT1000 |
| B | Without PT1000 |
| Explosion Proof | 0 | None |
| EX | Explosive Proof |
