“These types of level Gauges are used for highly hazardous/toxic liquids where gauge glasses are susceptible to attack by the process medium.”Their maximum working temperature and pressure range can be 4000C and 220 bar respectively. Use of these devices is mainly recommended for combustible, risky and corrosive fluids. Besides, they are capable for inter-phase level detection. Liquids involving extreme temperature and pressure can also measured by these gauges.
They can be installed in underground storage tanks also. These types of level sensors work upon two fundamental principles. One is the Archimedes Principle which states that any object submerged in a fluid tends to experience the same buoyant force as the weight of the liquid put out of place. The other principle is the phenomena of attraction and repulsion between opposite poles and similar poles of permanent magnets respectively.