Lefoo Electromagnetic Flowmeter

Widely Applications of Lefoo Electromagnetic Flowmeter

Lefoo electromagnetic flowmeters offer significant advantages across a wide range of applications, and large-diameter instruments are mostly used in water supply and drainage projects; medium and small calibers are often used in high-demand or difficult-to-measure occasions, such as blast furnace tuyere cooling water control in the iron and steel industry, measurement of pulp and black liquor in the paper industry, and chemical industry. Strong corrosive liquid, ore pulp in non-ferrous metallurgy industry; small-diameter and micro-diameter are often used in places with hygiene requirements such as pharmaceutical industry, food industry, and biochemistry.

The Features of Lefoo Electromagnetic Flowmeter

1. Stable Accuracy Under All Conditions: Lefoo electromagnetic flowmeters deliver precise measurements that remain unaffected by changes in fluid density, viscosity, temperature, pressure, or conductivity—ensuring consistent performance in complex environments.

2. Non-Intrusive Design, No Pressure Loss: With no obstructing parts inside the measuring tube, Lefoo flowmeters avoid additional pressure loss and reduce straight pipe requirements, making them highly adaptable to slurry measurement applications.

3. Durable Materials for Long-Term Use: Carefully selected sensor lining and electrode materials provide superior resistance to corrosion and wear, guaranteeing long service life even in demanding industrial settings.

4. Advanced Converter Technology: Equipped with a novel excitation method, the converter ensures low power consumption, stable zero point, and high measurement accuracy with a wide flow range up to 150:1.

5. Flexible Installation Options: The converter can be integrated with the sensor or installed separately, providing greater flexibility for different industrial applications.

6. Intelligent Control & Easy Operation: Built with a 16-bit high-performance microprocessor and a 2×16 LCD display, parameter settings are simple, programming is reliable, and operations are user-friendly.

7. Comprehensive Measurement & Output Options: The two-way measurement system includes three totalizers (forward, reverse, and difference). It supports multiple outputs—current, pulse, digital communication, and HART—meeting various industry needs.

8. Reliable Self-Test & Diagnosis: Using advanced Surface Mount Technology (SMT), the converter is equipped with self-test and self-diagnosis functions to ensure reliable and stable operation.

9. High Measurement Precision: The induced voltage signal is linearly related to the average flow rate, ensuring high accuracy regardless of changing fluid properties.

10. Long Service Life Without Moving Parts: With no obstructions and no moving parts in the measuring pipeline, the Lefoo sensor provides zero additional pressure loss and exceptional durability.

11. Short Straight Pipe Requirement: Thanks to its full-space magnetic field signal, the required straight pipe length is just five times the pipe diameter, reducing installation complexity.

12. Next-Generation Converter Performance: Powered by the latest MCU and SMT technologies, the converter ensures reliable performance, high precision, low energy consumption, and user-friendly settings, with LCD display for cumulative and real-time flow data.

13. Stable Two-Way Measurement System: Lefoo electromagnetic flowmeters support both forward and reverse flow measurement. With specialized production technology and premium materials, the product performance remains stable over the long term—making Lefoo a trusted electromagnetic flowmeter manufacturer worldwide.

Professional Selection of Electromagnetic Flowmeter Lining Materials by Lefoo

The lining material should be selected according to the corrosiveness, abrasiveness and temperature of the measured medium:

1. Natural rubber (soft rubber)

(1) Good elasticity, wear resistance and tearing force

(2) Resistant to general weak acid and weak alkali corrosion

(3) Measuring water and sewage

2. Acid-resistant rubber (hard rubber)

Resistant to the corrosion of hydrochloric acid, acetic acid, oxalic acid, ammonia water, phosphoric acid and 50% sulfuric acid, sodium hydroxide, potassium hydroxide at room temperature, but not resistant to the corrosion of strong oxidants

Measure general acid, alkali and salt solution

3. Neoprene

Measure water, sewage, mud and slurries

(1) Excellent elasticity, high breaking force, good wear resistance

(2) It is resistant to corrosion by general low-concentration acid-base and salt solutions, but not resistant to corrosion by oxidative media

<80℃;

4. Polyurethane rubber

Measure neutral and highly abrasive coal slurries, slurries and ore slurries

(1) Excellent wear resistance

(2) Poor acid and alkali resistance

<40℃

5. Polytetrafluoroethylene (PTFE)

Concentration measurement, concentrated alkali strong corrosive solution and hygienic medium

(1) Resistant to boiling hydrochloric acid, sulfuric acid, nitric acid, aqua regia, concentrated alkali and various organic solvents

(2) Good wear resistance and poor adhesion

-80～+180℃;

Lefoo Electromagnetic Flowmeter Installation Made Simple and Efficient

Electromagnetic flowmeters are widely used in sewage, fluorine chemical, production water, tap water industry, medicine, steel and many other aspects. Due to the principle, it can only measure conductive liquids. Although it is much better than other types of flowmeters in terms of reliability and stability, customers will still encounter some problems in the actual use process. Let me explain in detail the selection and installation of electromagnetic flowmeters:

First, like other flowmeters, although the electromagnetic flowmeter has a measurement range ratio of 30:1, which is higher than that of vortex flowmeters and differential pressure flowmeters, it is also limited. Comparing it with a water meter, it is thought that it can measure a very low flow rate. Under normal circumstances, it can only measure 0.1m/s. It is difficult for an electromagnetic flowmeter to measure correctly below this flow rate. Therefore, it is necessary to clarify the flow range ratio in the early stage of ordering. When ordering, it is not possible to order according to the original pipe diameter, it is best to determine the diameter of the instrument according to your actual flow.

Second, like other flowmeters, electromagnetic flowmeters also have requirements for straight pipes before and after installation, but they have lower requirements than other types of flowmeters, but the most critical point is to meet: that is, the pipe is full, and then the pipe is full. When the pipe is not full, it is easy to cause the flowmeter to jump randomly:

Third, like other flowmeters, electromagnetic flowmeters also have protection levels. Generally, the integrated protection level is IP65, and the split type is IP68 (for sensors). If the customer has requirements for the installation environment of the instrument, the installation location is underground. In wells or some other wet places, it is recommended that customers choose the split type. In order to avoid damage to the instrument due to wrong selection.

Fourth, the electromagnetic flowmeter can measure corrosive liquids, but at the beginning of the order, the customer should correctly provide other measurement medium properties, so as to avoid errors in the selection of the electrode during the selection, resulting in the sensor being scrapped in the later use process, bringing inconvenience to customers and economic loss.

Fifth, although the electromagnetic flowmeter has good reliability and will not be damaged under normal circumstances, due to its principle, the electrode surface of the sensor has been in contact with the liquid. After a long time, the electrode surface is more likely to be polluted. Therefore, in general, when the electromagnetic flowmeter is dismantled by the customer, it is recommended that the electrode be disassembled and cleaned once a year to one and a half years to ensure the measurement accuracy of the entire flowmeter. Any instrumentation requires "maintenance", and electromagnetic flowmeters are no exception.

Sixth, when the main line is a vertical pipeline, under normal circumstances, the water flow is required to be bottom-up, and try not to be top-down. The latter is likely to cause relatively large flow fluctuations. In addition to the installation of full pipes, this is also very important, followed by the distance between the front and rear straight pipes.

Choose a place that is easy to maintain and easy to move around. The flowmeter should be installed at the back end of the pump, never on the suction side; the valve should be installed on the downstream side of the flow.