Working Principle of Level Transmitters
The working principle of level transmitters mentioned above varies according to their underlying principle. For instance, capacitance level transmitters operate through a capacitor, hydrostatic level transmitters depend on the pressure of a fluid in a storage container for level measurement, while ultrasonic level transmitters convert the distance travelled by an ultrasonic wave to determine the level, and so on. However, all these level transmitters measure the level in either of the three ways:
The weight of the fluid
The pressure head of the fluid
The position of the fluid in a container
Level measurements are classified into two types– direct and indirect level measurements or performed by contact or non-contact transmitters. Direct level measurements are considered ideal for small level changes, which are observed in various industrial tanks. However, most level transmitters are designed for indirect level measurements as they are sensitive and designed for too high or too low level measurements, where direct measurement becomes difficult. Ultrasonic level transmitters can be availed in contact- or non-contact configurations.
Magnetic Level Transmitters
These transmitters use a magnetic object, which is suspended in a buoyant float. This is usually in a narrow auxiliary column, to restrict lateral movements of the float. While the float is on top of the liquid, the movement of the float is measured by a different magnetic device. This allows a precise and stable fill level to be transmitted. This method is suitable for continuous measurement owing to the tendency of the float to rise or sink based on the liquid level.
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