Magnetic liquid level gauge principle and abnormal solution

The magnetic flap level gauge can be used for medium level detection of various towers, tanks, tanks, spherical containers and boilers. Magnetic flap level gauge can achieve high sealing, anti-leakage and suitable for high temperature, high pressure, corrosion-resistant occasions. It makes up for the defects of the glass plate (tube) level gauge with poor indication clarity and easy breakage, and has no blind area in the whole process measurement, with clear display and large measurement range.
Compared with other types of liquid level instruments, the magnetic flap level gauge has more advantages in safety, because the local display of the liquid level can be realized without relying on other electronic devices, and it is stable and reliable, and fluctuates. Small, it has been widely used in pressure vessels of thermal power plants: high and low pressure deaerators, raw water heaters, heat network heaters, high and low pressure heaters of units, condensers and other heat exchangers are all installed with this liquid level count. For example, the working medium of the heat exchanger is a liquid that is easily vaporized, the pressure ranges from vacuum to 2.5Mpa, and the temperature ranges from 40°C to 390°C. Therefore, the daily maintenance of the liquid level gauge and the accuracy of the indication are very important for the pressure vessel. safe operation plays a vital role.
Vacorda Instruments has organized the relevant knowledge of the magnetic flap level gauge for you.
1. The working principle of the magnetic flap level gauge The operation principle of the magnetic flap level gauge simulates the magnetic flap level gauge (also known as the magnetic float level gauge), which works according to the principle of buoyancy and the principle of magnetic coupling. When the liquid level in the measured container rises and falls, the float in the main pipe of the liquid level gauge also rises and falls, and the permanent magnet steel in the float is transmitted to the field indicator through magnetic coupling, which drives the red and white column to rotate 180°. When the level rises, the turning column turns from white to red, and when the liquid level drops, the turning column turns from red to white. The red and white boundaries of the indicator are the actual height of the medium liquid level in the container, so as to realize the indication of the liquid level. . The relationship between the column and the float of the magnetic flap level gauge
2. Factors to be considered when selecting models 1. Measurement objects, such as the physical and chemical properties of the measured medium, as well as working pressure and temperature, installation conditions, and the speed of liquid level change. 2. Measurement and control requirements, such as measurement range, measurement (or control) accuracy, display mode, on-site indication, remote indication, interface with computer, safety and corrosion resistance, reliability and convenience of construction. 3. The problem of demagnetization of magnetic materials should also be considered. Demagnetization will cause the level gauge to not work properly, and the measurement results may be inaccurate.
Third, the characteristics of the magnetic flap level gauge 1. The measurement range is large, and it is not limited by the height of the container. 2. The indication is novel, the reading is intuitive and eye-catching, and the direction of the observation indicator can be changed according to the user’s needs. 3. It is suitable for the measurement of the liquid level and interface of the liquid medium in the container. In addition to on-site instructions, it can also be equipped with remote transmitters, alarm switches, and complete detection functions. 4. Simple structure, convenient installation, convenient maintenance, corrosion resistance, no power supply, explosion-proof.
4. The problem of inaccurate indication of the magnetic flap level gauge
1. Judgment method (1) The container is always running, but the liquid level of the container is always stopped at a certain point. (2) When the container increases or decreases the load, the liquid level of the container remains unchanged. (3) The local liquid level gauge does not match the pressure difference liquid level gauge on the indoor display screen.
2. Reasons (1) The water in the container rises or falls too fast, that is to say, the float rises or falls too fast, and the magnetic flap does not have time to flip. (2) The center of gravity of the magnetic flap is not at the center point. When the maglev rises, it flips with the maglev. When the maglev rises again, the flap returns to its original position, and there is no water level. (3) There are too many water impurities in the container, which are adsorbed on the surface of the maglev. Causes the magnetic levitation to drop, and when the magnetic levitation rises, the flap cannot be driven to rotate. (4) The liquid phase conduit of water is blocked differently, causing the actual water level in the container to rise. The maglev does not rise with it.
3. Solution (1) Try to make the water level in the container rise or fall not too fast. (2) Magnetic flap of water level gauge, the center of gravity is not at the center point. The build quality is not up to standard and should be replaced. (3) Unqualified water quality should be washed regularly.
4. Maintenance (1) There should be no solid impurities and magnetic impurities in the cylinder of the liquid level gauge, so as to avoid blocking the float and weaken the buoyancy. (2) According to the condition of the medium, the main pipe can be cleaned regularly to remove the sediment and impurities in the pipe. (3) After cleaning the liquid level gauge or when replacing the float, open the drain flange. When installing the magnetic float, pay attention to the heavy end with the magnetic end facing upwards and cannot be installed upside down. (4) For low-temperature and liquefied gas-specific products, the main body of the liquid level gauge is insulated with a vacuum jacket. During installation and use, be careful not to damage the jacket, so as not to affect the quality of the product.


Post time: 25-02-22