The levels of substances that flow are detected by level sensors that include slurries, granular materials, liquids, and powders. In their containers or other physical boundaries, fluids and fluidized solids flow to become essentially level and this happens due to gravitational force whereas most bulk solids tend to pile at an angle of repose to a peak.
A container may hold the substance that needs to be measured or they can also be available in their natural form like a lake or a river. Either continuous or point values, the level measurement can be measured. Within a specified range and determine the exact amount of substance in a certain place, continuous level sensors measure level, while point-level sensors only exhibits whether the substance is above or below the sensing point. Levels that are excessively high or low are generally detected by the latter.
The selection of the method of optimal level monitoring for industrial and commercial processes are affected by many physical and application variables. The criteria for selection includes liquid, solid or slurry, pressure or vacuum, temperature, dielectric constant of medium, agitation, chemistry, density (specific gravity) of medium, vibration, acoustical or electrical noise, tank or bin size, mechanical shock 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.
These days many leading industries offer cost effective and level measuring instruments of high quality that includes level transmitters, liquid level switches for use in a broad range of fluid/fuel and solids service materials in a broad range of process industries.
Recently companies have introduced a new capacitance based fuel level sensors, the function of which is reliable petrol/oil/fuel level measurement. Companies offer a comprehensive range of products that helps in level detection and are well suited to work out most level control applications. The range being offered helps in the detection of conductive and non-conductive liquids, plastics, grains and granulates.
For both on/off control and continuous monitoring of levels, a range of level sensors and level control relays are available. Companies also offer capacitive level sensors, conductive probes and amplifiers, optical sensors, ultrasonic sensors and magnetic level probes. Thus, these sensors are a great help in finding suitable solutions for level detection.