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Level Sensor Liquid Level Sensor Gauging Level Made Simple

The level of substances that flow, including liquids, slurries, granular materials, and powders are detected by level sensors.To become level in the container holding them, fluids and fluidized solids flow and this is possible because of gravity.Measurable substances can be inside a container or can be in its natural form like a pond or a river.The measurement of level can be either continuous or point values.Within a specified range, level can be measured by continuous level sensors thereby determining the exact amount of substance in a certain place.On the other hand, whether the substance is above or below the sensing point is indicated only by point-level sensors.Generally excessively high or low levels can be detected by the latter.The selection of the optimal level monitoring method for industrial and commercial processes is affected by several physical and application variables.The criteria for selection includes - the physical: phase (liquid, solid or slurry), pressure or vacuum, temperature, density, chemistry, dielectric constant of medium, agitation (action), vibration, acoustical or electrical noise, mechanical shock, tank or bin size and shape.The constraints related to its application are equally significant.These constraints are appearance, cost, accuracy, rate of response, physical size, ease of calibration or programming, mounting of the instrument, monitoring or control of continuous or discrete (point) levels.Point level detection of liquids pulse-wave ultrasonic (non invasive) - the transmit signal consists of short bursts of ultrasonic energy and this is the principle behind a pulsed-ultrasonic technology.The electronics looks for a return signal after each burst, within a small window of time corresponding to the time it takes for the energy to pass through the vessel.For additional processing of signal, only signal received during this window period will qualify.Within this window, the dry signal will not be received, and therefore will be ignored.Magnetic and mechanical float the opening or closing of a mechanical switch, either through direct contact with the switch, or magnetic operation of a reed is involved in the principle behind magnetic, cable, mechanical and other float level sensors.Switching occurs when a permanent magnet sealed inside a float rises or falls to the actuation level with magnetically actuated float sensors.Similarly switching occurs as a result of the movement of a float against a miniature (micro) switch with a mechanically actuated float.Chemical compatibility, specific gravity, temperature, buoyancy, and viscosity affect the selection of the stem and the float for both magnetic and mechanical float level sensorspneumatic where there is no electric power, hazardous conditions exist, and in applications involving heavy sludge or slurry, pneumatic level sensors are used.Conductive for the point level detection of a wide range of conductive liquids such as water, conductive level sensors are ideal and they are also well suited for highly corrosive liquids.

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