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Overview and purpose/Overview and purpose---------------------------------------------------◆◆
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| Electromagnetic flow meters are used to measure the volumetric flow rate of conductive liquids and slurry liquids in closed pipelines. They are suitable for industries such as petrochemicals, steel metallurgy, water supply and drainage, water conservancy and irrigation, water treatment, environmental wastewater total control, electricity, papermaking, food, etc. They can be matched with computers to achieve system control. 2、 Principle |
Working principle/working principle-----------------------------------------------------------◆◆
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| The measurement principle of electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. The measuring tube of the flowmeter is a non-magnetic alloy short tube lined with insulating material. Two electrodes are fixed on the measuring tube by passing through the tube wall along the diameter direction. The electrode tip is basically flush with the inner surface of the lining. When the excitation coil is excited by bidirectional square wave pulses, a working magnetic field with a magnetic flux density of B will be generated in the direction perpendicular to the axis of the measuring tube. At this point, if a fluid with a certain conductivity flows through the measuring tube, an electromotive force E will be induced by cutting the magnetic field lines. The electromotive force E is proportional to the product of the magnetic flux density B, the inner diameter d of the measuring tube, and the average flow velocity V. The electromotive force E (flow signal) is detected by the electrode and sent to the converter through a cable. After amplifying and processing the flow signal, the converter can display the fluid flow rate and output signals such as pulses and simulated currents for flow control and regulation. |
In Figure 1-1, when the conductive fluid flows at an average velocity V（ ）By installing a pair of measuring electrodes with an inner diameter of D（ ）When the insulated tube flows, and the tube is in a uniform magnetic field with a magnetic induction intensity of B (T). So, an electromotive force (E) perpendicular to the magnetic field direction and flow direction will be induced on a pair of electrodes. According to the law of electromagnetic induction, it can be written as equation (1): |
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Structural composition/Structural components-----------------------------------------------------◆◆
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Product Features/Product features-----------------------------------------------------------◆◆
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| 1. The instrument structure is simple, reliable, without movable parts, and has a long working life. |
| 2. There are no flow blocking components, and there is no pressure loss or fluid blockage. |
| 3. No mechanical inertia, fast response, good stability, can be applied to automatic detection and adjustment of programmable control systems. |
| 4. The measurement accuracy is not affected by the type of measured medium and its physical parameters such as temperature, viscosity, pressure, etc. |
| 5. A separately designed sealing component at the connection between the sensor and the meter head can prevent external moisture from entering the meter head and sensor through the connection. |
| 6. The excitation and electrode wires are both made of high-quality single core shielded wires, which can reduce interference, improve signal cleanliness, and thus enhance measurement accuracy. |
| 7. The surface paint of the sensor is made of metal fluorocarbon paint. The fluorocarbon bonds attached to the fluorocarbon resin molecules in the metal fluorocarbon paint can resist the degradation of ultraviolet radiation, exhibiting extremely excellent durability, UV resistance, and weather resistance, making the metal fluorocarbon paint coating long-lasting and perfect, reducing maintenance requirements. |
| 8. It has bidirectional flow measurement and bidirectional total accumulation function, and has three internal integrators that can display positive cumulative value, negative cumulative value, and difference cumulative value respectively. |
| 9. Frequency programmable low-frequency ternary wave excitation improves the stability of flow measurement and reduces power loss. |
| 10. Adopting a new 32-bit ARM+CPLD with high integration, fast computation speed, and high calculation accuracy. |
| 11. All digital processing, strong anti-interference ability, and reliable measurement. |
| 12. Ultra low EMI switching power supply, suitable for a wide range of power supply voltage changes, high efficiency, low temperature rise, and good EMC performance. |
| 13. Chinese and English menu operation, easy to use, simple to operate, easy to learn and understand. |
| 14. High definition and wide temperature OLED display. |
| 15. Using intelligent judgment without using measurement correction settings makes air traffic control alarm and electrode detection applications more convenient. |
| 16. Advanced "coarse error processing" technology can remove sharp interference from fluid measurements such as slurry, reduce output jitter, and maintain high precision measurement while making the output more stable. |
| 17. It has self checking and self diagnostic functions. |
| 18. New keyboard processing method to avoid keyboard operations affecting measurements. You can enter and exit the operation menu to make parameter settings more convenient. |
| 19. Use AD421 current dedicated chip to make 4-20mA current output more stable. |
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Technical parameters/Technical parameters-------------------------------------------------------◆◆
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| name |
Focmag3102 electromagnetic flowmeter |
| Nominal Diameter |
DN10-DN1800 |
| Dielectric conductivity |
≥5uS／cm |
| accuracy |
Level 0.5, Level 1.0 (differentiated by caliber) |
| flow rate range |
0.5-10m/s, recommended 1-5m/s |
| ambient temperature |
Sensor: (-40~+80) ℃, Converter: (- l5~+50) ℃ |
| medium temperature |
≤100℃ |
| Lining material |
Polytetrafluoroethylene, chloroprene rubber, polyurethane, perfluoroalkoxy (F46) PFA |
| Electrode material |
316L、 Hastelloy C, Hastelloy B, titanium, tantalum, platinum/iridium alloy, stainless steel coated with tungsten carbide |
| pressure rating |
DN10-DN400: 1.6MPa DN450-DN600:1.0MPa ≥ DN700: 0.6Mpa Please specify when ordering special specifications |
| Shell material |
Carbon steel and stainless steel |
| Installation form |
Integrated; split type |
| communication |
RS485 (Modbus protocol) HART |
| output signal |
Fully isolated (4-20mA current, pulse, upper and lower limit alarm) |
| load resistance |
4-20mA is 0-750 Ω |
| Power consumption |
≤15W |
| power supply |
220V AC 50HZ、24V DC |
| Display on monitor |
Instantaneous flow rate, flow velocity, percentage, empty pipe ratio, positive Reverse accumulation, alarm display |
| protection grade |
IP65 IP68 (special customization required) |
| Explosion proof grade |
ExⅡBT6 Gb |
| Electrical interface |
M20*1.5 |
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| caliber |
measuring range |
caliber |
measuring range |
caliber |
measuring range |
| (mm) |
(m 3 /h) |
(mm) |
(m 3 /h) |
(mm) |
(m 3 /h) |
| DN10 |
0.14 ～ 1.40 |
DN125 |
22.08～ 441.56 |
DN700 |
692.37 ～13847.40 |
| DN15 |
0.32 ～ 6.36 |
DN150 |
31.79～ 635.85 |
DN800 |
904.32～ 18086.40 |
| DN20 |
0.57～ 11.30 |
DN200 |
56.52 ～ 1130.4 |
DN900 |
1144.5～ 22890.60 |
| DN25 |
0.88～ 17.66 |
DN250 |
88.31 ～ 1766.25 |
DN1000 |
1413.0～ 28260.00 |
| DN32 |
1.45～ 28.94 |
DN300 |
127.17～ 2543.40 |
DN1200 |
2034.7～ 40694.40 |
| DN40 |
2.26～ 45.22 |
DN350 |
173.09～ 3461.85 |
DN1400 |
2769.4～ 55389.60 |
| DN50 |
3.35～ 70.65 |
DN400 |
226.08～ 4521.60 |
DN1600 |
3617.2～ 72345.60 |
| DN65 |
5.97～ 119.40 |
DN450 |
286.31～ 5722.65 |
DN1800 |
4578.1～ 91562.40 |
| DN80 |
9.04～ 180.86 |
DN500 |
353.25～ 7065.00 |
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| DN100 |
14.13 ～ 282.60 |
DN600 |
508.68～ 10173.6 |
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Product dimensions/Product dimensions-----------------------------------------------------◆◆
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| All-In-One |
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A=155mm |
| B=200mm |
| C=240mm |
| Total height=H+A |
| Split type |
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A=85mm |
| B=155mm |
| C=115mm |
| Total height=H+A |
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| Nominal diameter DN |
pressure rating |
Outer diameter of flange D |
Bolt hole center circle diameter K |
Bolt hole n-L |
Total length L |
Height H |
Reference weight kg |
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10 |
PN40 |
90 |
60 |
4-φ14 |
200 |
190 |
10 |
|
15 |
PN40 |
95 |
65 |
4-φ14 |
200 |
190 |
10 |
|
20 |
PN40 |
105 |
75 |
4-φ14 |
200 |
190 |
10 |
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25 |
PN40 |
110 |
85 |
4-φ14 |
200 |
200 |
10 |
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32 |
PN40 |
140 |
100 |
4-φ18 |
200 |
205 |
11 |
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40 |
PN40 |
150 |
110 |
4-φ18 |
200 |
215 |
12 |
|
50 |
PN40 |
165 |
125 |
4-φ18 |
200 |
220 |
15 |
|
65 |
PN16 |
185 |
145 |
4-φ18 |
200 |
240 |
16 |
|
80 |
PN16 |
200 |
160 |
8-φ18 |
200 |
255 |
18 |
|
100 |
PN16 |
220 |
180 |
8-φ18 |
250 |
270 |
20 |
|
125 |
PN16 |
250 |
210 |
8-φ18 |
250 |
300 |
25 |
|
150 |
PN16 |
285 |
240 |
8-φ22 |
300 |
330 |
30 |
|
200 |
PN16 |
340 |
295 |
12-φ24 |
350 |
390 |
45 |
|
250 |
PN16 |
405 |
355 |
12-φ26 |
450 |
450 |
65 |
|
300 |
PN16 |
460 |
410 |
12-φ28 |
500 |
500 |
79 |
|
350 |
PN16 |
520 |
470 |
16-φ30 |
550 |
520 |
95 1 |
|
400 |
PN16 |
580 |
525 |
16-φ32 |
600 |
635 |
40 |
|
450 |
PN10 |
615 |
565 |
20-φ26 |
600 |
685 |
150 |
|
500 |
PN10 |
670 |
620 |
20-φ26 |
600 |
750 |
170 |
|
600 |
PN10 |
780 |
725 |
20-φ30 |
600 |
830 |
200 |
|
700 |
PN6.0 |
860 |
810 |
24-φ26 |
700 |
890 |
335 |
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800 |
PN6.0 |
975 |
920 |
24-φ30 |
800 |
1095 |
440 |
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900 |
PN6.0 |
1075 |
1020 |
24-φ30 |
900 |
1195 |
568 |
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1000 |
PN6.0 |
1175 |
1120 |
28-φ30 |
1000 |
1295 |
758 |
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1200 |
PN6.0 |
1405 |
1340 |
32-φ33 |
1200 |
1395 |
875 |
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1400 |
PN6.0 |
1630 |
1560 |
36-φ36 |
1400 |
1595 |
1235 |
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1600 |
PN6.0 |
1830 |
1760 |
40-φ36 |
1600 |
1700 |
1650 |
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1800 |
PN6.0 |
2045 |
1970 |
44-φ39 |
1800 |
1930 |
1790 |
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| 1. All data in the above table are based solely on standard sensors |
| 2. Other pressure levels not listed may have different sizes |
| For sensors with smaller diameters, the size of the meter head may be larger than that of the sensor |
| Note: The above dimensions are for reference only. If there are special selections, the value may vary |
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Product selection/product selection---------------------------------------------------------◆◆
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| Lining material |
Performance |
Maximum medium temperature |
scope of application |
| All-In-One |
separated |
| Polytetrafluoroethylene (F4) |
1. It is the most chemically stable plastic, capable of withstanding boiling hydrochloric acid, sulfuric acid, nitric acid, and aqua regia, as well as concentrated alkali and various organic solvents. Not resistant to corrosion from chlorine trifluoride, high-temperature chlorine trifluoride, high-speed liquid fluorine, liquid oxygen, and ozone. |
70℃ |
100 ℃ 150 ℃ (special order required) |
1. Strong corrosive media such as concentrated acid and alkali
2. Sanitary media
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| 2. The wear resistance is not as good as polyurethane rubber. |
| 3. Its ability to resist negative pressure is not as good as that of chloroprene rubber. |
| Perfluoroethylene propylene diene (F46) |
|
ditto |
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| Polyfluoroethylene (Fs) |
The upper limit of applicable temperature is lower than that of polytetrafluoroethylene, but the cost is also lower. |
80℃ |
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| neoprene |
1. It has excellent elasticity, high tensile strength, and good wear resistance. |
80 ℃ 120 ℃ (special order required) |
Water, sewage, and wear-resistant slurry slurry |
| 2. Resistant to corrosion in general low concentration acid, alkali, and salt media, but not resistant to corrosion in oxidizing media. |
| polyurethane |
1. Extremely strong wear resistance. |
80℃ |
Neutral strong abrasion slurry, coal slurry, mud |
| 2. Poor corrosion resistance. |
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| Electrode material |
Corrosion resistance and wear resistance |
| Stainless steel 0Cr18Ni12Mo2Ti |
Used for weakly corrosive media such as industrial water, domestic water, sewage, etc., suitable for industrial sectors such as petroleum, chemical, steel, as well as municipal and environmental protection fields. |
| Hastelloy B |
It has good corrosion resistance to all concentrations of hydrochloric acid below boiling point, as well as to non chlorinated acids, bases, and non oxidizing salt solutions such as sulfuric acid, phosphoric acid, hydrofluoric acid, and organic acids. |
| Hastelloy C |
Can withstand corrosion from non oxidizing acids such as nitric acid, mixed acids, or mixed media of chromic acid and sulfuric acid, as well as corrosion from oxidizing salts such as Fe++, Cu++, or other oxidizing agents, such as hypochlorite solutions above room temperature and seawater. |
| titanium |
Capable of withstanding corrosion from seawater, various chlorides and hypochlorites, oxidizing acids (including fuming sulfuric acid), organic acids, and alkalis. Not resistant to the corrosion of relatively pure reducing acids (such as sulfuric acid, hydrochloric acid), but if the acid contains oxidants (such as nitric acid, Fe+++, Cu++), the corrosion is greatly reduced. |
| tantalum |
Has excellent corrosion resistance, similar to glass. Except for hydrofluoric acid, fuming sulfuric acid, and alkali, it can withstand corrosion from almost all chemical media, including boiling point hydrochloric acid, nitric acid, and sulfuric acid below 150 ℃. Not corrosion-resistant in alkali. |
| Platinum/Iridium Alloy |
Capable of withstanding almost all chemical media, but not suitable for use with aqua regia and ammonium salts. |
| Stainless steel coating |
Used for non corrosive and highly abrasive media. |
| Note: Due to the wide variety of media and the complex factors such as temperature, concentration, and flow rate that affect their corrosiveness, this table is for reference only. Users should make their own choices based on the actual situation, and if necessary, conduct corrosion resistance tests on the selected materials, such as hanging plate tests. |
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Installation method/Installation method---------------------------------------------------------◆◆
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| Straight pipe section: Using a straight pipe section can prevent the medium from generating eddy currents or distortions due to the influence of bent pipes, TT type tees, globe valves, and variable diameter pipes |
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| Grounding: The flowmeter must be grounded according to regulations to ensure reliable operation and prevent operators from receiving electric shock |
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| a. Metal pipes without inner wall coating or lining shall not be grounded using grounding rings. |
| b. Metal pipes and insulated pipes with inner wall coating or lining shall be grounded using grounding rings. |
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Wiring Guide/Wiring guide-----------------------------------------------------------------◆◆
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| a. The wiring of the electromagnetic flow converter must be completed by professional technicians. |
| b. All wiring should be done after cutting off the power supply; Connect correctly and securely according to the instructions. |
| c. Tighten the compression nut and end cap of the outlet sleeve to maintain a good seal of the converter. |
| d. Surge suppression devices should be installed on lines that are susceptible to lightning surges. |
| e. Before supplying power, all wiring should be checked again for accuracy and correctness. |
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| Terminal diagram of circular integrated converter |
Terminal diagram of square split converter |
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| Important note about active and passive 4-20mA: |
| The electromagnetic flowmeter is a 4-wire instrument that is different from the two-wire instrument's 4-20mA. The two-wire 4-20mA instrument requires an ammeter to be measured and an external 24V power supply to work properly. However, the electromagnetic flowmeter itself is a 4-wire 4-20mA instrument that already has a 24V power supply inside and does not require an external connection. It only needs to be connected to a simple ammeter. Without special customization instructions, our company's electromagnetic flow meters are all active 4-20mA and do not require an external 24V power supply, otherwise the instrument will be burned out. |
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| ① Integrated electromagnetic flowmeter active 4-20mA output wiring (by default, the integrated electromagnetic flowmeter is active 4-20mA, and the user equipment ammeter cannot have power output) |
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② Passive 4-20mA output wiring of integrated electromagnetic flowmeter (Passive 4-20mA of integrated electromagnetic flowmeter needs to be specified when ordering, otherwise it is an active 4-20mA output) |
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| ③ Active 4-20mA output wiring of split electromagnetic flowmeter (split electromagnetic flowmeter does not require special customization and supports both active and passive 4-20mA) |
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④ Passive 4-20mA output wiring of split electromagnetic flowmeter (split electromagnetic flowmeter does not require special customization and supports both active and passive 4-20mA) |
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| ⑤ How does the user device determine whether active current output or passive current output is required? |
| a. Disconnect the 4-20mA connection wire between the electromagnetic flowmeter and the user equipment to ensure that the user equipment is in an open circuit state. |
| b. Use a digital multimeter to measure whether the 4-20mA connection line of the user device has a voltage of around 24V. |
| c. If there is a voltage of around 24V, passive current output is required; otherwise, active current output is required; |
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Transportation mode/type of shipping------------------------------------------------------------◆◆
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| a. Do not lift the flowmeter through the integrated converter housing |
| b. Do not use metal suspension chains |
| c. Please use leather straps to lift the flowmeter |
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Common faults and solutions/Common failures and solutions----------------------------------◆◆
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| Fault name |
solution |
| Converter has no display |
1. Check if the power supply is connected |
| 2. Check if the fuse is intact |
| 3. Check if the power supply voltage meets the requirements |
| If all three of the above are normal, the converter will be returned to the factory for repair |
| Excitation alarm |
1. The insulation degree of the excitation coil decreases |
| Air traffic control alarm |
1. Whether the tested fluid is full in the pipe |
| 2. Whether the flowmeter is installed correctly as required |
| 3. The conductivity of the tested fluid is too low |
| 4. The air traffic control threshold is set too low |
| Display traffic when there is no traffic |
1. The air traffic control threshold is set too high |
| 2. Air traffic control alarm allowed not to be turned on |
| 3. The electrode is contaminated, causing a zero offset (at this time, the pipeline is full) |
| 4. The insulation degree of the signal line decreases (at this time, the pipeline is full) |
| Flow measurement is inaccurate or fluctuates greatly |
1. Is the fluid filled in the pipe |
| 2. Is the flowmeter grounded according to regulations |
| 3. The insulation degree of the signal line decreases |
| 4. Whether the flowmeter is installed correctly as required |
| Traffic limit alarm |
1. If the on-site traffic exceeds the traffic limit threshold, modify the traffic limit threshold |
| Flow lower limit alarm |
1. If the on-site traffic is below the lower limit threshold, modify the lower limit threshold of the traffic |
| No traffic display when there is traffic |
1. Is the shut-off valve open |
| 2. Signal line grounding |
| 3. Low traffic, high small signal cutoff setting |
| 4. The air traffic control threshold is set too low |
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