What is need of level measurement? Give classification of level measurement methods with two examples of each.

What is need of level measurement? Give classification of level measurement methods with two examples of each.
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In almost all industries, vast quantities of liquid such as water solvents, chemicals etc. are used in number of processes. It is widely employed to monitor as well as measure quantitatively the liquid content in the tanks, containers and vessels et . Liquid level affects both pressure and rate of flow in and out of the container and therefore its measurement becomes important in a variety of processes encountered in modern manufacturing plants. 


Classification of Liquid Level Measurement: 

Direct method 1. Hook type 2. Sight glass type 3. Float type 4. Dip stick 

Indirect method 1. Hydrostatic pressure type 2. Electrical type:  a) Capacitance level indicator b) Radiation level detector c) Ultrasonic level gauge 3. Radar type

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