A basic magnetic level sensor is a type of device used to determine the liquid level in a container or tank. It operates on the principle of utilizing the magnetic properties of a float and a sensor to detect the level of a liquid. Here's how it works:
Components: A magnetic level sensor consists of two main components: a float and a sensor. The float is a buoyant object that rises and falls with the liquid level, and it contains a magnet or is magnetically attached to a magnet. The sensor is typically mounted externally to the tank and contains a magnetic field detection mechanism.
Installation: The magnetic level sensor is installed on the outside of the container or tank in a position where the liquid level needs to be monitored. The float is placed inside the tank and moves up and down with the changing liquid level.
Magnetic Interaction: As the liquid level changes, the float rises or falls accordingly. Since the float contains a magnet or is magnetically connected to one, its position affects the magnetic field around it.
Sensor Detection: The sensor, positioned on the exterior of the tank, detects changes in the magnetic field caused by the movement of the magnetized float. When the float moves closer to the sensor, the magnetic field strength detected by the sensor increases. Conversely, when the float moves away from the sensor, the magnetic field strength decreases.
Output Signal: The sensor translates the changes in magnetic field strength into an electrical signal. This signal can be in the form of voltage, current, or other digital signals, depending on the specific sensor design.
Processing and Output: The electrical signal is then processed by associated electronics, which might include amplification, filtering, and signal conditioning. Depending on the application and sensor design, the processed signal can be used to provide various outputs, such as analog voltage or current signals, digital signals, or even wireless communication signals.
Level Indication: The processed signal is finally used to indicate the liquid level. This indication can be displayed on a local indicator, transmitted to a control room or automation system, or used for various alarm and control functions.
Overall, the basic magnetic level sensor operates by detecting changes in the magnetic field strength caused by the movement of a magnetized float as it rises or falls with the liquid level inside a tank. This technology is simple and reliable, making it a common choice for various liquid level measurement applications in industries such as chemical processing, water treatment, and oil and gas.