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Introduction Level measurement plays a crucial role in ensuring the safe and efficient operation of industrial processes. From storage tanks in oil depots to chemical reactors and nuclear containment vessels, accurate and reliable level detection ensures effective inventory management, process control, and safety compliance. This module provides a comprehensive overview of the technologies used for level measurement, including contact and non-contact methods, challenges faced in real-world applications, and the criteria for choosing the right instrument. Focus areas include tank farms, silos, separators, and reactor vessels across industries like oil & gas, manufacturing, energy, and nuclear power. Section 1: Principles of Level Measurement 1.1 Differential Pressure (DP) Measurement Operating Principle: Level is inferred from the hydrostatic pressure exerted by the height of the liquid. A DP transmitter with one port at the bottom and one at the reference point measures the...