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1. Direct Method - Sight Glass Method, Hook Guage Method, Float-Type Level Indicator.
2. Indirect Method - Electrical Methods, Hydrostatic Pressure Measurement Method.
LEC 45 II - DIRECT METHODS OF LEVEL MEASUREMENT
Level sensors detect the level of liquids and other fluids and fluidized solids, including slurries, granular materials, and powders that exhibit an upper free surface. Substances that flow become essentially horizontal in their containers (or other physical boundaries) because of gravity whereas most bulk solids pile at an angle of repose to a peak. The substance to be measured can be inside a container or can be in its natural form (e.g., a river or a lake). The level measurement can be either continuous or point values. Continuous-level sensors measure levels within a specified range and determine the exact amount of substance in a certain place, while point-level sensors only indicate whether the substance is above or below the sensing point. Generally the latter detect levels that are excessively high or low.
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