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Contents measurement in silos
January 2019, Level Measurement & Control

Each industry provides its own challenges with regard to accurate process control. In the mining and metal processing industry, accurate level measurement is a challenge due to the increased volume of noise, dust, heat and, in some cases, zone specification safety requirements.

UWT Level Control has developed its instruments around the problems faced in the field. Decades of research and fine tuning have resulted in the Nivobob series of plumb bob sensors, which are used for continuous level measurement in storage bunkers and silos, as well as for interface measurement. When it comes to the mining industry, successful level measurement can be obtained in many applications through the UWT Nivobob continuous level measurement device. It uses a simple electromechanical principle, and is a reliable all-rounder in bulk silo monitoring and stockpiling under harsh conditions.

The sensor weight, which is tailored to each specific application, attached to either a tape or rope, is electromechanically lowered from the top into the vessel or pit. Once the sensor weight rests on the material, the winding direction of the motor changes and the sensor weight is rewound to the upper stop position in the device. For interface measurements, the sensor weight can be adjusted according to the density of the sediment.

The distance is electronically measured and, together with the preprogrammed silo geometry information, the microprocessor converts this distance into a volumetric output signal of 4-20 mA, Modbus RTU or Profibus DP. As the system is immune to dust, EMI, humidity and caking, the Nivobob always delivers a reliable level measurement. It is simple to operate and durable, which keeps maintenance and downtime to a minimum.

Contents measurement in raw coal silos

A coal mine required a reliable level measurement technology for a 17,75 x 1,5 m coal silo. The requirements included optimal performance in the dusty environment and easy installation under harsh conditions.

For this application, the Nivobob NB3200 was implemented as an ingeniously simple solution. In the dusty environment, the electromechanical system operated reliably and installed with ease. Due to the integrated cleaner mechanism on the inlet guide, dust and other contaminants were

not able to penetrate the mechanical area inside of the instrument. The Nivobob NB3200 was recommended in thisinstance for its robust and long-term operational capabilities in heavy mining applications.

For more information contact Morton Controls, 086 100 0393,,

Supplied By: Morton Controls
Tel: 086 100 0393
Fax: +27 21 557 9095
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Further reading:

  • A wavelength for all situations
    January 2019, Endress+Hauser, Level Measurement & Control
    113 GHz: the best fitting radar frequency for every level application.
  • Concentration monitoring for pulp and paper
    October 2018, Morton Controls, Analytical Instrumentation & Environmental Monitoring
    In the pulp and paper industry, the alkaline sulphate process, which is where fibrous material is separated from lignin, is important. These chemicals need to be recycled, due to environmental and economic ...
  • SIL2 for UWT’s rotating paddle ­series
    October 2018, Morton Controls, Level Measurement & Control
    The terms ‘functional safety’ and ‘safety integrity level’ (SIL) have occurred more frequently since the publication of the international standard IEC 61508/IEC61511. Particularly in systems with hazard-causing ...
  • Level measurement is becoming more sophisticated
    October 2018, KROHNE, Level Measurement & Control
    Since radar was developed and deployed during WW II, its use has expanded enormously. As technology advances, these uses are also advancing. For example, radar technology is used in the motor industry ...
  • The right wavelength
    September 2018, Endress+Hauser, Level Measurement & Control
    113 GHz: the best fitting radar frequency for every level application.
  • SIL2 for rotating paddle level switch
    September 2018, Morton Controls, Level Measurement & Control
    The terms functional safety and safety integrity level (SIL) have occurred more frequently since the publication of the international standard IEC 61508/IEC 61511. Particularly in systems with hazard-causing ...
  • Pushing the pulper towards maximum efficiency
    August 2018, VEGA Controls SA, Level Measurement & Control
    Non-contact measuring methods have become well established in the paper industry.
  • Avoiding cross-contamination
    August 2018, Morton Controls, Enclosures, Cabling & Connectors
    Food-borne diseases and bacteria are a concern at factories dealing with various forms of food, beverage and bio-pharma products, using the same machines. While all the plants in these industries have ...
  • Reliable wastewater treatment
    July 2018, Siemens Digital Factory & Process Indust. & Drives, Level Measurement & Control
    To update and optimise its wastewater disposal system, the authorities of the City of Edmonton in Alberta, Canada, opted to use level measurement technology from Siemens. Installing the Sitrans LUT400 ...
  • Slurry control valves for level control
    July 2018, eDART Group, Level Measurement & Control
    In order to improve the froth level control at a flotation concentrator in Rustenburg, eDART was recently commissioned to replace the froth level control valves on the secondary cleaner. Froth level ...
  • Through-air radar for level measurement
    June 2018, VEGA Controls SA, Level Measurement & Control
    Radar is one of the most common level measurement technologies in the instrumentation market. Whether measuring liquids or solids, from chemical plants to wastewater facilities to ready-mix cement manufacturers, ...
  • Enhanced pressure vessel level measurement
    May 2018, EOH Process Automation Solutions, Level Measurement & Control
    The traditional approach to level measurement in a pressurised vessel, such as a boiler, has been to use a conventional differential pressure (DP) transmitter with external water-filled ‘wet’ legs connecting ...

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