variabelareamätare

A variable area flow meter, known in Swedish as a "variabelareamätare," is a type of flow meter used to measure the volumetric flow rate of a fluid. It operates on the principle of a float moving within a tapered tube. The wider end of the tube is at the top, and the narrower end is at the bottom. As the fluid flows upwards through the tube, it lifts a float. The higher the flow rate, the higher the float rises in the tube. The cross-sectional area between the float and the tube wall increases as the float moves upwards. This increasing area is what gives the meter its name, "variable area."

The position of the float is directly proportional to the flow rate. A scale is typically marked on the outside of the tapered tube, calibrated to indicate the flow rate at different float positions. Different types of floats can be used, made from materials like metal, glass, or plastic, depending on the fluid properties and the required accuracy. The fluid density and viscosity can affect the float's movement, and the meter is usually calibrated for a specific fluid at a certain temperature and pressure. Variable area flow meters are generally simple, robust, and cost-effective, making them suitable for a wide range of industrial applications where direct visual indication of flow is desired. They are commonly used for liquids and gases.