The Displacer Type Magnetic Level Switch operates using the buoyancy principle and is an effective solution for measuring liquid levels. These sensors are highly versatile and come with various alarm and control options, making them suitable for a wide range of applications, regardless of their complexity.
The working principle of a Displacer Magnetic Level Switch involves the suspension of one or two split displacers from a wire rope, which are then connected to a coupler rod.
This rod carries an actuator that moves within a nonmagnetic barrier tube via a compression spring, as shown in Figure 1.
Initially, when the displacer is not immersed in liquid, the spring is compressed due to the weight of the displacer, and the actuator is positioned outside the magnetic field at position P1. As the liquid level rises, the displacer becomes immersed, causing it to undergo weight loss according to Archimedes’ principle. This results in an upward motion of the coupler rod, which allows the spring to assume its original status and move the actuator to position P2 within the magnetic field.
When the actuator moves to P2, it triggers the micro switches, resulting in changeover contacts that provide an indication of the liquid level. This mechanism makes Displacer Type Magnetic Level Switches highly effective at accurately measuring liquid levels.
When installing a Displacer Type Magnetic Level Switch, it’s important to take certain precautions to ensure accurate measurement and proper functioning.
These precautions include:
Displacer Level Switches offer a variety of installation options to suit different tank configurations and applications.
These installation options include:
Choosing the right installation option is essential to ensure accurate measurement and reliable performance of the Displacer Type Magnetic Level Switch. By selecting the appropriate installation method, one can effectively monitor liquid levels and prevent any potential issues related to tank overfill or underfill.
Maintenance of a Displacer Type Magnetic Level Switch is essential to ensure accurate measurement and reliable performance.
The following maintenance steps should be followed:
Some of the common problems and solutions of Displacer Magnetic Level Switches are mentioned below.