蒙自LF-14D Series Compact Electromagnetic Flowmeter
● The measurement is unaffected by changes in fluid density, viscosity, temperature, pressure, and electrical conductivity.
● The electrode and lining materials are integrally molded, offering excellent stability and reliability.
● Equipped with self-check and self-diagnosis functions.
● Can be configured via HART handheld device
● The sensor features a PEEK lining, enabling the pipeline to operate under negative pressure.
● Equipped with RS485 functionality (please specify when ordering)
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Product Description
Product Overview Product overview
The LF-14D series electromagnetic flowmeters integrate the sensor and converter of traditional electromagnetic flowmeters into a single compact unit, offering flexible installation options. Operated via an infrared remote control, these meters are easy to install and configure, making them ideal for use across various industries to measure the volumetric flow of conductive liquids with conductivity greater than 2.5 µS/cm. They are precision instruments designed specifically for sensing the volume flow of electrically conductive media. Equipped with a powerful 32-bit ARM Cortex-M3 processor and a high-resolution 24-bit ADC data acquisition system, these flowmeters deliver rapid processing speeds and exceptional accuracy. Additionally, the device features advanced self-diagnostic capabilities, including empty-tube detection, excitation circuit fault monitoring, and flow-rate alarms, ensuring reliable operation. The sensor is crafted with imported PEEK material as its inner lining, while the electrodes are integrally molded directly onto the PEEK liner using a one-step injection molding process. This innovative manufacturing approach guarantees consistent quality and long-term reliability in every product.
Product Principle THE PRODUCT PRINCIPLE
An electromagnetic flowmeter operates based on Faraday's law of electromagnetic induction, which states that a conductor moving through a magnetic field will generate an induced voltage. The liquid 
Can be considered a conductor; the magnetic field is generated by an energized coil located outside the flow tube. The magnitude of the induced voltage is directly proportional to the conductor's velocity and type, as well as to the pipe diameter and the strength of the magnetic field—and is calculated as follows:
E = B × V × D × K
Where:
E - Induced electromotive force;
B - Magnetic flux density;
V – Velocity of the conducting fluid;
D – Electrode spacing; (measured inner diameter of the tube)
K – A coefficient (instrument constant) related to the magnetic field distribution and axial length;
Among them:
B, D, and K can either be fixed values or calibrated, simplifying the equation to: E ∝ V.
The sensor detects the electromotive force E as a flow signal and transmits it to the converter. After amplification, transformation, filtering, and other signal-processing steps, the system displays both the instantaneous flow rate and the total accumulated flow on a backlit dot-matrix LCD.
Performance metrics TECHNICAL PARAMETERS
Execution Standard: Electromagnetic Flow Sensor (JB/T9248-2015)
Verification Procedure: Electromagnetic Flowmeters (JJG1033-2007)
Tested medium: Conductive liquid (with conductivity not less than 2.5 µS/cm)
Flow meter lining: Polyether Ether Ketone (PEEK) liner
Flow meter diameter: DN15–DN50
Pressure: -0.1 MPa to 6.3 MPa
Electrode material: 316L
Body material: 304, 316L
Electrical Connection: M12-4-Pin Connector
Pipe interface: Default is imperial external thread. Other interfaces available upon request.
Accuracy class: ±0.3%FS
Repeatability: ≤0.1%
Output signal: 4–20mA (maximum load 500Ω)
Measurement range ratio: 1:150
Power supply: 18–30 VDC
Power consumption: 5W
Environmental conditions
Ambient temperature: -10°C to +60°C
Storage temperature: -25°C to +85°C
Relative humidity: 5%–95%
Protection rating: IP65/IP67
Measurement range:
| Caliber | Volumetric flow rate (L/H) | Volumetric flow rate (L/min) |
| DN6 | 6–900 L/h | 0.1 L/min to 15 L/min |
| DN10 | 15–2250 L/h | 0.25 L/min to 37.5 L/min |
| DN15 | 40–6000 L/h | 0.7 L/min to 100 L/min |
| DN20 | 60–9,000 L/h | 1.0 L/min to 150 L/min |
| DN25 | 100–15,000 L/h | 1.7 L/min to 250 L/min |
| DN32 | 150–22,500 L/h | 2.5 L/min to 375 L/min |
| DN40 | 250–37,500 L/h | 4.2 L/min to 625 L/min |
| DN50 | 400–60,000 L/h | 6.7 L/min to 1000 L/min |
External dimensions APPEARANCE OF SIZE
| DN | A (mm) | B(mm) | C (mm) | D (mm) | E (mm) | F (mm) | G (mm) | S(mm) |
| 6 | 150 | 76 | 90 | 6 | M12 x 1 | 50 | NPT 1/4" | 14 |
| 10 | 150 | 76 | 90 | 10 | M12 x 1 | 50 | NPT 3/8" | 17 |
| 15 | 150 | 76 | 90 | 15 | M12 x 1 | 50 | G 3/4" | 27 |
| 20 | 150 | 89 | 90 | 20 | M12 x 1 | 56.5 | G 3/4" | 27 |
| 25 | 150 | 89 | 90 | 25 | M12 x 1 | 56.5 | G 1" | 36 |
| 32 | 200 | 108 | 100 | 32 | M12 x 1 | 69 | G 1-1/4" | 42 |
| 40 | 200 | 108 | 100 | 40 | M12 x 1 | 69 | G 1¾" | 56 |
| 50 | 200 | 108 | 100 | 50 | M12 x 1 | 69 | G 2" | 80 |
Installation Requirements INSTALLATION
Installation of electromagnetic flowmeters on pipelines:
The flow direction should align with the positive direction indicated by the arrow on the sensor.
a. Bolts and nuts: To facilitate installation, ensure adequate clearance near the pipe flange for easy assembly.
b. If the medium or ambient temperature exceeds 50°C, implement proper enclosure overheating protection during installation to prevent burns from accidental contact with hot surfaces.
Electrical Connections: Users are provided with two types of electrical connectors: an M12 connection plug (which allows users to route the cable themselves to the flowmeter installation location before connecting it to the plug) and an M12 electrical connection cable (default length: 2 meters).
To avoid measurement errors caused by entrained gas, please install the flowmeter in the position shown below:
Tianjin Ling Yu Technology Co., Ltd.
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Factory Address: No.5 Yingbin Road, Xiqing District, Tianjin
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