Magnetic level indicators are widely used in level measurement instruments. The interaction between an internal float magnet and external magnetic flags provides continuous level information with virtually no maintenance. These level indicators require no power supply, making them suitable for a variety of applications across industries.
The working principle of a magnetic level indicator is based on the effect of one magnet on nearby magnets. Its simple yet highly effective mechanical structure provides reliable and repeatable level information for continuous monitoring and recording of liquid levels.
How does a magnetic level indicator work?
The working principle of a magnetic level indicator is that the measuring instrument and the liquid inside the container are at the same level. The level indicator is mounted on the container and is in direct contact with the liquid being measured. Inside the container, there is a float with a magnetic assembly, located on the liquid surface. As the liquid level rises or falls, the float moves accordingly. With the up-and-down movement of the float, the magnetic assembly rotates a series of bicolor magnetic flags or baffles, thus changing the color of a visual indicator mounted outside the chamber.
Because the working principle of magnetic level indicators relies on the interaction between magnets, these level measuring instruments require no power supply. They require virtually no maintenance. Another advantage is that the indicator's magnetism can affect optional switches or transmitters mounted outside the chamber. The colored flags are easily visible even from a distance and work in conjunction with the scale for accurate readings. For any level gauge, the float size and material are selected based on the medium, temperature, pressure, and density of the process medium.
Magnetic level indicators are suitable for most industrial and commercial applications, including:
Refining and Chemical Industries
Energy and Power Plant Technology
Feedwater Heaters and Boilers
Oil and Gas Industry
Offshore Exploration and Drilling
Pipeline Compressor Applications
Paper and Pulp
Food and Beverage
Gas Plants
Pharmaceutical Industry
Level gauges based on the magnetic level indicator principle can provide the required accuracy and reliability.
Factors to Consider When Selecting a Magnetic Level Gauge
Always specify the appropriate magnetic level gauge for your specific process operating conditions. This will be greatly influenced by the following factors:
Vessel Type
Temperature
Fluid Density
Operating Pressure
For corrosive fluids, this can be addressed by adjusting the chamber and float construction to higher-grade materials (such as Hastelloy or Alloy 20).
Achieve Optimal Magnetic Level Gauge Performance
For easy reading from a distance, our magnetic level gauges utilize a bicolor indicator mounted on the gauge chamber, but completely isolated from the process fluid. Because the indicator is magnetically locked to the position of a float within the sealed chamber and moves with the float, it provides an accurate, real-time indication of the tank level every time you check. We have magnetically stabilized the indicator to further ensure accurate level readings regardless of fluid movement.
