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LF14 Series Electromagnetic Flowmeters
● Measurement is unaffected by changes in fluid density, viscosity, temperature, pressure, and electrical conductivity.
● The measuring tube features no obstructive components, resulting in zero pressure loss and reduced requirements for straight pipe sections. It also exhibits unique adaptability for slurry measurement.
● Properly select electrode and lining materials that exhibit excellent corrosion resistance and wear resistance.
● Fully digital processing, strong anti-interference capability, reliable measurement, high accuracy, and a wide flow measurement range
● Ultra-low EMI switching power supply, suitable for a wide range of input voltage variations and featuring excellent EMI resistance.
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Product Description
Product Overview Product overview
The LF14 series electromagnetic flowmeter consists of two main components: the sensor and the converter. It operates based on Faraday's law of electromagnetic induction, making it ideal for measuring the volumetric flow rate of conductive liquids—it’s a velocity-type instrument. In addition to accurately measuring the flow of common conductive liquids, this device can also handle highly corrosive fluids like strong acids and strong bases, as well as uniform liquid-solid two-phase suspensions such as mud, mineral slurries, and pulp. The flowmeter is widely used in industrial sectors including petroleum, chemical processing, metallurgy, light industry, papermaking, environmental protection, and food production, as well as in municipal management, water conservancy projects, and river dredging operations for precise flow measurement.
Performance metrics TECHNICAL PARAMETERS
| Implementation Standards |
Electromagnetic Flowmeter (JB/T9248-1999) |
| Nominal Diameter (mm) (Special specifications available upon request) |
Pipe-type four-flange lining: DN10–DN600 |
| Pipe-type rubber village: DN65–DN2000 |
|
| Flow direction |
Gross, net, and net-of-tax cash flows |
| Measurement range ratio |
20:1 |
| Repetitive error |
Measurement accuracy of ±0.1% |
| Accuracy Level |
Class 0.5, Class 1.0 |
| Measured medium temperature |
Standard rubber lining: -20~+60°C |
| High-temperature rubber lining: -20°C to +90°C |
|
| PTFE lining: -30°C to +120°C |
|
| High-temperature PTFE lining: -20~+160°C |
|
| Rated working pressure (High-pressure, customizable) |
DN10–DN50 4.0 MPa |
| DN65–DN300 ≤1.6 MPa |
|
| DN350–DN600 1.0 MPa |
|
| DN700–DN2000 ≤ 0.5 MPa |
|
| Flow rate range |
0.5-10m/s |
| Electrical Signal Frequency Range |
The conductivity of the fluid being tested is ≥5 µS/cm |
| Signal output |
4–20mA (load resistance 0–750Ω), pulse/frequency, control level |
| Communication Output |
RS485, MODBUS protocol, HART protocol, Profibus-DP protocol |
| Power supply |
220VAC, with a tolerance of ±15%, or 24VDC, with ripple ≤5%. |
| Required straight pipe length |
Upstream = 5 DN, Downstream = 2 DN |
| Connection method |
Flow meters are connected to the piping systems using flanges that comply with the national standard: GB/T 9113.1-2000. |
| Explosion-proof rating |
Exd[ib]qII CT6 Gb |
| Protection Level |
IP65, custom-made options available up to IP68 |
| Ambient temperature |
-25 to +60°C |
| Relative humidity |
5% to 95% |
| Total Power Consumption |
Less than 20W |
How it works Working Principle
According to Faraday's law of electromagnetic induction, a pair of detection electrodes is installed on the pipe wall perpendicular to both the axis of the measuring tube and the magnetic field lines. As the conductive liquid moves along the axis of the measuring tube, it cuts through the magnetic field lines, generating an induced voltage. This induced voltage is detected by the two electrodes and is directly proportional to the flow rate, with its magnitude given by:
E = B · V · D · K
Where: E – Induced electromotive force
K—A coefficient related to the magnetic field distribution and axial length,
B - Magnetic Induction Intensity
V - Average flow velocity of the conductive liquid
D - Electrode spacing; (measured inner diameter of the tube)
The sensor detects the electromotive force E as a flow signal and transmits it to the converter. After undergoing a series of digital processing steps—including amplification, transformation, and filtering—the signal is displayed on a backlit dot-matrix LCD, showing both instantaneous and cumulative flow rates. The converter features 4–20mA output, alarm output, and frequency output, along with communication interfaces such as RS-485, and supports HART and MODBUS protocols.
External dimensions APPEARANCE OF SIZE
| Sensor mounting dimensions | ||||||||
| Nominal Diameter (mm) |
L (mm) |
D (mm) |
K (mm) |
H (mm) |
H (mm) |
nxd (mm) |
Withstand Voltage Rating | Specially designed for high pressure Level |
| 10 | 120 | 60 | 60 | 260 | 190 | 4 × 14 | 4MPa | Below 16 MPa |
| 15 | 200 | 95 | 65 | 310 | 240 | 4 × 14 | ||
| 20 | 200 | 105 | 75 | 315 | 245 | 4 × 14 | ||
| 25 | 200 | 115 | 85 | 325 | 255 | 4 × 14 | ||
| 32 | 200 | 140 | 100 | 325 | 255 | 4 × 18 | ||
| 40 | 200 | 150 | 110 | 340 | 270 | 4 × 18 | ||
| 50 | 200 | 165 | 125 | 355 | 285 | 4 × 18 | ||
| 65 | 200 | 185 | 145 | 375 | 305 | 4 × 18 | 1.6MPa | 4.0MPa |
| 80 | 200 | 200 | 160 | 385 | 315 | 8 × 18 | ||
| 100 | 250 | 220 | 180 | 415 | 325 | 8 × 18 | ||
| 125 | 250 | 250 | 210 | 445 | 355 | 8 × 18 | ||
| 150 | 300 | 285 | 240 | 475 | 385 | 8 × 22 | ||
| 200 | 350 | 340 | 295 | 505 | 415 | 12 × 22 | ||
| 250 | 450 | 405 | 355 | 590 | 500 | 12 × 22 | ||
| 300 | 500 | 460 | 410 | 645 | 555 | 12 × 22 | ||
| 350 | 500 | 505 | 460 | 695 | 605 | 16 × 22 | 1.0MPa | 2.5MPa |
| 400 | 600 | 565 | 515 | 745 | 655 | 16 × 26 | ||
| 450 | 600 | 615 | 565 | 825 | 735 | 20 × 26 | ||
| 500 | 600 | 670 | 620 | 878 | 788 | 20 × 26 | ||
| 600 | 600 | 780 | 725 | 988 | 898 | 20 × 30 | ||
| 700 | 700 | 860 | 810 | 1095 | 1005 | 24 × 30 | 0.6MPa | 1.0MPa |
| 800 | 800 | 975 | 920 | 1208 | 1138 | 24 × 34 | ||
| 900 | 900 | 1075 | 1020 | 1310 | 1220 | 28 × 34 | ||
| 1000 | 1000 | 1175 | 1120 | 1413 | 1323 | 28 × 36 | ||
| 1200 | 1200 | 1405 | 1340 | 1525 | 1435 | 32 × 33 | ||
| 1400 | 1400 | 1630 | 1560 | 1735 | 1645 | 36 × 36 | ||
| 1600 | 1600 | 1830 | 1760 | 1965 | 1875 | 40 × 36 | ||
| 1800 | 1800 | 2045 | 1970 | 2155 | 2065 | 44 × 39 | ||
| 2000 | 2000 | 2265 | 2180 | 2365 | 2275 | 48 × 42 | ||
Note: H* refers to the height of the split-type electromagnetic flowmeter sensor.
This instrument's height is measured based on the dimensions of the LDG (integrated) converter and is provided for reference only. For precise data, please contact our sales team.
Installation Requirements INSTALLATION
The pipeline must be completely filled with liquid. Ensuring the pipeline remains fully charged with fluid is critical, as failure to do so can affect flow readings and even lead to measurement errors. The design of the pipeline structure must guarantee that the flow tube is consistently filled with fluid at all times. When the fluid splits into multiple paths or contains solid particles or sediment, a vertical installation is recommended. However, if using a vertical setup, make sure the fluid flows from bottom to top to maintain proper filling of the pipeline.
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Tianjin Ling Yu Technology Co., Ltd.
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