Types of Level Transmitter
|
Level transmitters or transducers are devices that allow the user to measure the level or amount of liquid, solid or slurry material in a specified space. These devices can measure either a point level or a continuous level. Point Level Point level transmitters alert you when a specific amount has been reached in the space. The alert is usually an audible alarm or a tripped switch. Continuous Level Continuous level transmitters repeatedly measure the amount in the space and provide readout for you after every measurement. Occasionally, multiple-point level transmitters can be run simultaneously to create a stepped version of a continuous level. Measurement Some level transmitters use a constant flow of gas to measure the hydrostatic pressure at that point to infer the amount of material in the space. Other types use radio frequency, electrical conductivity or mechanical floats. Other Types Even more routes of measurement include using pressure membranes, which measure the amount of pressure applied to a membrane surface, and microwave- or radar-driven transmitters, which emit a pulse at the process material. Sonic and Vibration The most advanced types use sonic waves or vibration to measure the amount of material. A test sound or vibration is broadcast through the material, and the amount of time it takes to hear its reemergence is measured. This time helps deduce the amount of material being measured. |
Previous:Fuel Level Sensor next:How to Make a Water Level Sensor