**Introduction
Magnetic level gauges are commonly used in industrial applications to measure the level of liquids in tanks and vessels. One of the key components of a magnetic level gauge is the float, which is responsible for indicating the liquid level. In this article, we will discuss in detail what a float is in magnetic level gauges and its importance in measuring liquid levels accurately.
**What is a float?
A float is a device that is used to indicate the level of liquid in a tank or vessel. In magnetic level gauges, the float is a buoyant object that is attached to a metal rod. The metal rod is placed inside a tube, which is mounted vertically on the side of the tank or vessel. The float moves up or down the metal rod depending on the level of the liquid in the tank or vessel.
**How does a float work in magnetic level gauges?
The float in a magnetic level gauge works on the principle of magnetic coupling. The metal rod in the tube is magnetized by a magnet at the top of the tube. The float, which is also magnetized, is attracted to the metal rod and moves up or down depending on the level of the liquid in the tank.
The magnet at the top of the tube is connected to an indicator, which displays the level of the liquid in the tank. As the float moves up or down the metal rod, it causes the magnet to move, which in turn causes the indicator to move, indicating the level of the liquid in the tank.
**Types of floats used in magnetic level gauges
There are different types of floats used in magnetic level gauges, each designed for specific applications. Some of the commonly used floats are:
1. Tubular floats: These are cylindrical floats that are used in applications where the liquid level is constant.
2. Bi-colour floats: These are floats with two colours, usually red and white. They are used in applications where it is important to visually differentiate between low and high levels.
3. Guided wave radar (GWR) floats: These are floats that use radar technology to measure the level of liquid in the tank. They are commonly used in harsh environments where other types of floats may not be suitable.
**Factors to consider when selecting a float for a magnetic level gauge
When selecting a float for a magnetic level gauge, it is important to consider various factors such as:
1. Chemical compatibility: The float material should be compatible with the liquid being measured.
2. Temperature and pressure: The float should be able to withstand the operating temperature and pressure of the tank or vessel.
3. Viscosity and density of the liquid: The float should be designed to work with liquids of varying viscosities and densities.
4. Accuracy: The float should be capable of providing accurate level readings across the full range of operation.
5. Maintenance: The float should be easy to maintain, and components such as seals and bearings should be easily replaceable.
**Advantages of using an magnetic level gauge with a float
Magnetic level gauges with a float offer several advantages over other types of level measurement systems. Some of these advantages include:
1. No contact with the liquid: The float is not in direct contact with the liquid, which makes it suitable for use with corrosive or hazardous liquids.
2. Easy to install: Magnetic level gauges with a float are easy to install and do not require the same level of calibration as other types of level measurement systems.
3. Accurate measurement: Magnetic level gauges with a float are capable of providing accurate level readings across the full range of operation.
4. Minimal maintenance: Magnetic level gauges with a float require minimal maintenance as there are no moving parts in contact with the liquid.
**Conclusion
In conclusion, a float is an important component of a magnetic level gauge used to measure the level of liquid in tanks and vessels. The float works on the principle of magnetic coupling and is available in different types depending on the application. When selecting a float for a magnetic level gauge, it is important to consider various factors such as chemical compatibility, temperature, pressure, viscosity, density, accuracy and maintenance. Magnetic level gauges with a float offer several advantages over other types of level measurement systems including no contact with the liquid, easy installation, accurate measurement and minimal maintenance.