FMG-R type: separate electromagnetic flowmeter

FMG-R type: separate electromagnetic flowmeter

FMG series: electromagnetic flowmeter,Electromagnetic FlowmeterFlow is detected using Faraday's law of induction. existElectromagnetic FlowmeterThere is an electromagnetic coil that generates a magnetic field inside, and an electrode for capturing electromotive force (voltage). FMG series adopts intelligent LCD display function. Dual language design. Display panel language: English/Traditional Chinese bilingual switching. Vertical installation. Various size range options. High precision: ±0.5% RD, anti-interference and no pressure loss. Multiple outputs: 4~20mA/pulse/MODBUS RTU.FGT The first general design conforms to the standard: EX-ATEX/BSMI/IP67/UL/IEC/SGS

Description

  • Smart LCD display function.
  • Display panel language: English/Traditional Chinese bilingual switch
  • Simple setup and installation.
  • Various size ranges to choose from.
  • Multiple outputs: 4~20mA/pulse/MODBUS RTU
  • High precision: ±0.5% RD
  • Anti-interference and no pressure loss.
  • Compliant with design standards: EX-ATEX/BSMI/I{67/UL/IEC/SGS

/Introduction to the principle of electromagnetic flowmeter/

Electromagnetic Flowmeters (EMF for short) is a new type of flow measuring instrument developed rapidly with the development of electronic technology in the 1950s and 1960s. Electromagnetic flowmeter is an instrument that uses the principle of electromagnetic induction to measure the flow of conductive fluid according to the electromotive force induced by the conductive fluid passing through an external magnetic field.

The principle of electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. When the conductor moves in the magnetic field to cut the magnetic field lines, an induced potential will be generated in the conductor, and the magnitude of the induced potential is proportional to the effective length of the conductor in the magnetic field and the speed of the conductor in the magnetic field perpendicular to the direction of the magnetic field. In the same way, when the conductive fluid flows in the vertical direction in the magnetic field and cuts the magnetic induction line, an induced potential will also be generated on the electrodes on both sides of the pipe.

The volume flow rate is equal to the product of the fluid velocity v and the pipe cross-sectional area (πD²)/4. When the pipe diameter D is fixed and the magnetic induction intensity B is kept constant, the measured volume flow rate has a linear relationship with the induced potential. If an electrode is inserted on both sides of the pipe, an induced potential can be introduced, and the volume flow can be obtained by measuring the magnitude of this potential.

1. Structure of electromagnetic flowmeter

The structure of electromagnetic flowmeter is mainly composed of magnetic circuit system, measuring conduit, electrode, shell, lining and converter.

1. Magnetic circuit system: its function is to generate a uniform DC or AC magnetic field. The DC magnetic circuit is realized by a permanent magnet, which has the advantages of simple structure and less interference by the AC magnetic field, but it is easy to polarize the electrolyte liquid in the measuring catheter, so that the positive electrode is surrounded by negative ions, and the negative electrode is surrounded by positive ions. Surrounding, that is, the polarization phenomenon of the electrodes, and leads to an increase in the internal resistance between the two electrodes, thus seriously affecting the normal operation of the instrument. When the diameter of the pipeline is large, the permanent magnet is correspondingly large, cumbersome and uneconomical, so the electromagnetic flowmeter generally adopts an alternating magnetic field, and is generated by the excitation of a 50HZ power frequency power supply.

2. Lining: There is a complete electrical insulating lining on the inner side of the measuring conduit and the sealing surface of the flange. It directly contacts the liquid to be measured, and its function is to increase the corrosion resistance of the measuring conduit and prevent the induced potential from being short-circuited by the wall of the metal measuring conduit. Lining materials are mostly corrosion-resistant, high-temperature-resistant, wear-resistant PTFE plastics, ceramics, etc.

3. Converter: The induced potential signal generated by the liquid flow is very weak and is greatly affected by various interference factors. The function of the converter is to amplify and convert the induced potential signal into a unified standard signal and suppress the main interference signal. Its task is to amplify and convert the induced potential signal Ex detected by the electrode into a unified standard DC signal.

4. Measuring catheter: its function is to let the measured conductive liquid pass through. In order to make the magnetic flux be shunted or short-circuited when the magnetic field line passes through the measuring conduit, the measuring conduit must be made of materials with non-magnetic conductivity, low electrical conductivity, low thermal conductivity and certain mechanical strength. Plastic, aluminum, etc.

5. Electrode: Its function is to draw out the induced potential signal proportional to the measured value. The electrodes are generally made of non-magnetic stainless steel and are required to be flush with the lining so that the fluid can pass unobstructed. Its installation position should be in the vertical direction of the pipeline to prevent sediment from accumulating on it and affecting the measurement accuracy.

6. Shell: Made of ferromagnetic material, it is the outer cover of the excitation coil of the distribution system, and isolates the interference of external magnetic fields.

Second, the principle of electromagnetic flowmeter

1. Basic principles

The basic principle of electromagnetic flowmeter is based on Faraday's law of electromagnetic induction

 

Working principle of electromagnetic flowmeter: According to the electromagnetic induction principle of flange, a pair of detection electrodes are installed on the pipe wall which is perpendicular to the axis of the measuring tube and the line of magnetic force. When the conductive liquid moves along the axis of the measuring tube, the conductive liquid cuts The magnetic line of force generates an induced potential, which is detected by two detection electrodes. The value is proportional to the flow rate, and its value is: E=B*V*D*K

The sensor transmits the induced electromotive force as a flow signal to the converter. After signal processing such as amplification, conversion filtering, etc., the instantaneous flow and cumulative flow are displayed by a dot-matrix liquid crystal with backlight.

E : Induced electromotive force

K : meter constant

B : Magnetic induction intensity

D : Measuring tube diameter

V : average flow velocity

2. Three important concepts

Electromagnetic flowmeter installation

(1) Only conductive medium can be measured

Conductivity limitation б≥ 1-5us/cm (water>20us/cm)

(Use special meter for low conductivity)

Cannot measure non-conductive medium, such as gas, oil, such as medium containing a large amount of

gas, producing severe fluctuations in measurement

(2) There must be a magnetic field

The excitation current flows through the upper and lower excitation coils of the measuring tube to generate a magnetic field. Excitation coil open circuit,

The flowmeter does not work, and the stability of the excitation current directly affects the measurement of the instrument

The measuring tube must be a non-magnetic material to ensure that the magnetic field passes through the tube

(Measuring tube should be made of stainless steel)

(3) The actual measured value is the fluid flow rate

The electromagnetic flowmeter actually measures the flow rate of the medium (it is the velocity is the flowmeter)

Measuring the volume flow of a medium

Proficient in flow rate conversion

3. Two important parts

Sensors and secondary instruments are two essential components of electromagnetic flowmeters.

Biogas flowmeter Tap water flowmeter Electromagnetic flowmeter English vortex flowmeter Gas flowmeter

Additional information

Application

Flow Meter

Types of

Electronic

Installation method

Flange

Output method

digital, analog

Application

Factory

Technical Specifications

model FMG-C FMG-R
All-in-one Separate type
Dimensions (mm) 15~3000
App types Chemical liquid, mud, raw water, purified water, waste water, sewage
Liquids with conductivity >20μs/cm
flow rate 0.1~15.0 m/s
Conductivity Greater than 20μS/cm
precision ± 0.5% of reading
Repeatability ± 0.25% of reading
Material of electrode and ground electrode Molybdenum-containing stainless steel, Hastelloy B, Hastelloy C, titanium, tantalum, platinum-iridium alloy
Body material carbon steel
Ground Ring Material Stainless steel 1Cr18Ni9Ti
Protection ring material DN15~DN600 Stainless steel 1Cr18Ni9Ti
DN700~DN3000 carbon steel
With protective lining material Highest temperature resistance Silicone Fluoroelastomer (FVMQ) <70℃ <180℃
Polytetrafluoroethylene (PTFE) <70℃ <170℃
Tetrafluoroethylene (PFA) <70℃ <160℃
Polyvinyl Fluoride – Propylene (F46) <70℃ <160℃
Polychloroprene (CR) <70℃ <80℃
Polyurethane rubber (PU) <70℃ <80℃
Maximum withstand voltage DN15~DN150 4.0Mpa
Maximum withstand voltage DN15~DN600 1.6Mpa
Maximum withstand voltage DN200~DN1000 1.0Mpa
Maximum withstand voltage DN700~DN3000 0.6Mpa
display panel 2-column backlit LCD display
Protection level IP68 measuring tube material and IP65 display panel
output signal 4~20 mA or 0~10mA or pulse output
communication signal RS485 (optional), RS232 (optional), WiFi+AIoT (optional)
power supply AC 85~265V 45~63Hz or DC 11~40V

Flow range

DN Maximum withstand voltage Flange size (integrated type) (mm) weight Flange size (separate type) (mm) weight Flow range (m3/h)
(mm) (Mpa) L D H1 H2 (kg) L D H1 H3 (kg) Qmin(0.01m/s) Qmax(15m/s)
15 4.0 200 95 155 285 7.5 200 95 155 215 8.5 0.0064 9.5426
20 105 160 290 8.5 105 160 220 9.5 0.0113 16.9646
25 115 165 295 9.0 115 165 225 10 0.0177 26.5072
32 140 180 310 10.5 140 180 240 11.5 0.2348 47.1828
40 150 190 320 11 150 190 250 12 0.4520 67.8584
50 165 200 330 13 165 200 260 14 0.7070 106.0288
65 2.5 250 185 220 350 15 250 185 220 280 16 0.1195 179.1886
80 200 240 370 17 200 240 300 18 0.1810 271.4336
100 1.6 250 235 250 380 19 250 235 250 310 20 0.2827 424.1150
125 250 270 280 410 23 250 270 280 340 24 0.4595 689.1869
150 300 300 320 450 28 300 300 320 380 29 0.6362 954.2588
200 1.0 350 340 380 510 36 350 340 380 440 37 1.1310 1696.4600
250 450 395 430 560 51 450 395 430 490 52 1.7671 2650.7188
300 500 445 490 620 71 500 445 490 550 72 2.5447 3817.0351
350 505 550 680 82 505 550 610 83 3.4636 5195.4089
400 565 600 730 99 565 600 680 100 4.5239 6785.8401
450 550 615 640 770 114 550 615 640 700 115 5.7256 8588.3289
500 670 700 830 134 670 700 760 135 7.0686 10602.8752
600 600 780 800 930 164 600 780 800 880 165 10.1788 15268.1403
700 0.6 700 880 895 1025 439 700 880 895 955 440 13.8544 20781.6354
800 800 975 1015 1145 549 800 975 1015 1075 550 18.0956 27143.3605
900 900 1075 1115 1245 659 900 1075 1115 1175 660 22.9022 34353.3157
1000 1000 1175 1230 1360 814 1000 1175 1230 1290 815 28.2743 42411.5008
1200 1200 1405 1450 1580 879 1200 1405 1450 1510 880 40.715 61072.5612
1400 1400 1630 1630 1760 1239 1400 1630 1630 1690 1240 55.4177 83126.5416
1600 1600 1830 1830 1960 1559 1600 1830 1830 1890 1560 72.3823 108573.4421
1800 1800 2045 2045 2175 2089 1800 2045 2045 2105 2090 91.6088 137413.2627
2000 2000 2265 2265 2395 2614 2000 2265 2265 2325 2815 113.0973 169646.0033
2200 2200 2475 2475 2605 3214 2200 2475 2475 2535 3215 136.8478 205217.6640
2400 2400 2685 2685 2815 3914 2400 2685 2685 2745 3915 162.8602 244290.2448
2600 2600 2905 2905 3035 4284 2600 2905 2905 2965 4285 191.1343 286701.4020
2800 2800 3115 3026 3245 500 2800 3115 3026 3175 5005
3000 3000 3315 3236 3445 5604 3000 3315 3236 3375 5605

Size Chart

FMG-dimension table (integrated type|separated type)
FMG-dimension table (integrated type|separated type)
DN Maximum withstand voltage Flange size (integrated type) (mm) weight Flange size (separate type) (mm) weight Flow range (m3/h)
(mm) (Mpa) L D H1 H2 (kg) L D H1 H3 (kg) Qmin(0.01m/s) Qmax(15m/s)
15 4.0 200 95 155 285 7.5 200 95 155 215 8.5 0.0064 9.5426
20 105 160 290 8.5 105 160 220 9.5 0.0113 16.9646
25 115 165 295 9.0 115 165 225 10 0.0177 26.5072
32 140 180 310 10.5 140 180 240 11.5 0.2348 47.1828
40 150 190 320 11 150 190 250 12 0.4520 67.8584
50 165 200 330 13 165 200 260 14 0.7070 106.0288
65 2.5 250 185 220 350 15 250 185 220 280 16 0.1195 179.1886
80 200 240 370 17 200 240 300 18 0.1810 271.4336
100 1.6 250 235 250 380 19 250 235 250 310 20 0.2827 424.1150
125 250 270 280 410 23 250 270 280 340 24 0.4595 689.1869
150 300 300 320 450 28 300 300 320 380 29 0.6362 954.2588
200 1.0 350 340 380 510 36 350 340 380 440 37 1.1310 1696.4600
250 450 395 430 560 51 450 395 430 490 52 1.7671 2650.7188
300 500 445 490 620 71 500 445 490 550 72 2.5447 3817.0351
350 505 550 680 82 505 550 610 83 3.4636 5195.4089
400 565 600 730 99 565 600 680 100 4.5239 6785.8401
450 550 615 640 770 114 550 615 640 700 115 5.7256 8588.3289
500 670 700 830 134 670 700 760 135 7.0686 10602.8752
600 600 780 800 930 164 600 780 800 880 165 10.1788 15268.1403
700 0.6 700 880 895 1025 439 700 880 895 955 440 13.8544 20781.6354
800 800 975 1015 1145 549 800 975 1015 1075 550 18.0956 27143.3605
900 900 1075 1115 1245 659 900 1075 1115 1175 660 22.9022 34353.3157
1000 1000 1175 1230 1360 814 1000 1175 1230 1290 815 28.2743 42411.5008
1200 1200 1405 1450 1580 879 1200 1405 1450 1510 880 40.715 61072.5612
1400 1400 1630 1630 1760 1239 1400 1630 1630 1690 1240 55.4177 83126.5416
1600 1600 1830 1830 1960 1559 1600 1830 1830 1890 1560 72.3823 108573.4421
1800 1800 2045 2045 2175 2089 1800 2045 2045 2105 2090 91.6088 137413.2627
2000 2000 2265 2265 2395 2614 2000 2265 2265 2325 2815 113.0973 169646.0033
2200 2200 2475 2475 2605 3214 2200 2475 2475 2535 3215 136.8478 205217.6640
2400 2400 2685 2685 2815 3914 2400 2685 2685 2745 3915 162.8602 244290.2448
2600 2600 2905 2905 3035 4284 2600 2905 2905 2965 4285 191.1343 286701.4020
2800 2800 3115 3026 3245 500 2800 3115 3026 3175 5005
3000 3000 3315 3236 3445 5604 3000 3315 3236 3375 5605

Application field

1. Monitoring of public water resources

*Legacy pipeline installation solution:

A large number of cloth-made plug-in electromagnetic flowmeters solve the requirements of convenience and speed without cutting pipes

*Meter reading record solution:

The integrated installation reduces the problem of borrowing space for different units in the public sector

2. Raw water metering of water works

*Legacy pipeline installation solution:

A large number of cloth-made plug-in electromagnetic flowmeters solve the requirements of convenience and speed without cutting pipes

 *Meter reading record solution:

The integrated installation reduces the problem of borrowing space for different units in the public sector

3. Sewage treatment and sewage measurement

Sewage Discharge Solutions:

There is no need to install a flange interface in the construction of the underground pipeline, just insert the opening

c Maintenance cleaning solutions:

Retractable and easily removable sensor head for cleaning

*Emissions metering solutions:

Air traffic control alarm to know the emission status at any time and the cumulative usage status through RS485 signal transmission

4. Filling water metering for printing, dyeing and finishing machine

*Chemical solution:

The acid and alkali resistant sensor head with protective lining is more suitable for use in the liquid pipeline.

*Equipment Solutions:

After installing the front and back ends of the equipment, clearly understand the energy consumption status of the equipment and effectively evaluate the energy status of the whole plant

 5. Circulating water monitoring in steel, thermal power and petrochemical plants

*Not sure about water quality installation solutions:

A large number of single types of protective lining grades are used to solve the opaque fluid situation of pipelines in the plant area

*Recycled water solutions:

On-site direct meter reading of the loop recovery pipeline and central monitoring of the cumulative recovery rate

6. Building property chilled water metering

*Building energy saving solutions:

Fast and convenient control of air-conditioning water in and out to improve energy consumption design of old buildings

*Sub-lease solution:

After the distribution pipeline is installed, the user's usage status is known in detail, and the display is used to solve the user's billing doubts

 

Order model

Ordering Information
FMG coding Model type
 

C Integrated type (standard type)
R Separate type
 

coding Electrode Type
N Standard
S scraper type
R Detachable scraper type
G with ground electrode
 

coding size
XXXX 15~3000 mm(1/2″~120″)
 

coding Electrode material
0 Molybdenum-containing stainless steel (standard type)
1 Hastelloy B
2 Hastelloy C
3 Titanium (Ti)
4 Tantalum (Ta)
5 Platinum-iridium alloy (Pt)
6 Stainless Steel Coated Tungsten Carbide
 

coding Protective lining material
0 None (standard type)
1 Polytetrafluoroethylene (PTFE)
2 Tetrafluoroethylene (PFA)
3 Polyvinyl Fluoride – Propylene (F46)
4 Polychloroprene (CR)
5 Polyurethane rubber (PU)
6 Silicone Fluoroelastomer (FVMQ)
 

coding Pressure resistance
0 4.0Mpa for DN15~DN150 (standard type)
1 1.6Mpa for DN15~DN600
2 1.0Mpa for DN200~DN1000
3 0.6Mpa for DN700~DN3000
 

coding output signal
A 4~20 mA (standard type)
P Pulse output
R RS-485 MODBUS communication
C RS-232 communication
W Wifi+AIoT communication
 

coding Temperature Controller
0 .~70 ℃(Standard type)
1 .~100 ℃ (applicable to separate lining material)
2 .~180 ℃ (applicable to separate lining material)
 

coding panel interface
N Chinese Traditional (Standard)
I English
 

 
coding connecting line
  N Integrated type without cable (standard type)
  R Separate type with 10m cable
   

coding power supply
  N AC AC 85~265V 45~63Hz (standard type)
  R DC DC 11~40V
   

 
coding label
    F FGT label (standard type)
    N Customized brand
 

FMG Complete order model
*Note: The annual purchase order of the customized brand needs to be more than 100 sets

meet design standards

meet design standards

meet design standards

  • EX-ATEX
  • IP67
  • BSMI
  • CE
  • IEC
  • SGS

Support communication protocol

  • NB-IOT
  • MODBUS-RTU
  • ZIGBEE

IoT software

SMM Cloud Sensor Software

from Google Playdownload

from App Storedownload

Inquiry form

You may also like…