Measurement method - continuous level measurement
Continuous level measurement, the constant determining of the fill level, is already built into many silos, containers or process vessels, in order to implement optimum material logistics. For these measuring applications various factors such as silo and vessel geometry, sensor mounting position, the properties of the medium such as flowability, bulk density, conductivity, moisture, dust and adhesion all play a role and must be considered when selecting the right measuring principle.
Level measurement using the Electromechanical Lot System - Nivobob
The electro-mechanical measuring principle offered by the Nivobob from UWT consists of a filling weight, which is fastened to a rope or tape; a motor which drives the sensing weight on a rope / tape reeled into the container and an electronic system which monitors the measurement starts and also evaluates the level. When the measurement begins, the sensor weight moves to the level surface and then returns immediately to the upper end/stop position. The electronics convert the travelled distance and level signal which can be read via analogue 4-20mA or Modbus RTU and Profibus DP.
This measuring principle operates in all challenging conditions within the container and for almost all bulk material applications. Special sensing weights for liquid and viscous media area available. Via the Fieldbus, interface measurement systems can be simply wired and integrated into the process control management.
Contactless Level Measurement Using Radar
Non-contact, continuous radar level measurement is achieved using advanced techniques in echo analysis and is suitable in open or closed vessels for the measurement of liquids or solids. The device operates at a high frequency of 78-79 GHz and has therefore a very narrow beam angle. These microwaves are reflected by the surface of the medium to be measured and recorded as an echo by the sensor. The transit time between transmitted and received microwaves is converted and the selected signal output is temperature compensated.