Level indicators
Introduction
Level sensors detect the level of liquids, fluidized solids, granular materials and powders that have a free upper surface. The surfaces of substances become essentially horizontal in their containers (or other physical boundaries) due to gravity, while most grain solids accumulate at an angle of repose up to a certain maximum angle. The substance to be measured may be inside a container or may be in its natural form (for example, a river or lake). The level measurement can be continuous or punctual. Continuous level sensors measure the level within a specific range and determine the exact amount of substance at a given location, while point level sensors only indicate whether the substance is above or below the detection point. Generally, the latter detect excessively high or low levels.[1].
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Contenido
[2].
Dentro de la categoría de medidores de nivel existen interruptores de nivel "todo o nada" (pseudo digital) que señalan el desbordamiento o vaciado de un depósito y otros que son medidores de un nivel analógico (del mínimo al máximo).
Vibrating tuning fork sensor for liquids and solids
Vibrating tuning fork sensors consist of symmetrical vibration forks, which can detect levels of very fine dust (grain density: 0.02 g/cm - 0.2 g/cm), fine powders (grain density: 0.2 g / cm - 0.5 g / cm and granular solids (grain density: 0.5 g / cm or higher). With proper selection of the vibration frequency and appropriate sensitivity settings, they can also be detected. intuit the level of highly fluidized electrostatic powders and materials.
Single probe vibrating level sensors are ideal for massive levels of powders. Since only one sensitive element contacts the powders, bridging between two probe elements is eliminated and carrier buildup is minimized. Vibration of the probe tends to remove material buildup on the probe element. Vibrating level sensors are not affected by dusts, static charge buildup from dielectric dusts, or changes in conductivity, temperature, pressure, humidity, or moisture content. Another alternative is tuning fork style vibration sensors. They tend to be less expensive, but are prone to buildup of materials between the cans.[3].