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Concrete production
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Ore storage in silos
The mined ore is transported with conveyor systems to large aboveground or underground silos and stored there until it is fed to subsequent process stages. Temperature changes as well as intense dust and noise generation characterise these storage silos. Ore lump size and angle of repose should not influence the level measurement. In this situation, noncontacting level measurement is ideal for monitoring the content of the silos reliably, stably and without the danger of equipment breakdown.
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Level measurement with VEGAPULS 68
VEGAPULS 68 is predestined for level measurement of bulk solids under extreme conditions. With a sensitivity much higher than conventional radar sensors, it is able to measure up to 70 m (230 ft) in silos for bulk solids. The high emitting frequency of the sensor (K band) and the specially optimised antenna for bulk solids achieve very strong focusing. Installations, struts and build-up on the walls cannot interfere. Neither the angle of repose nor dust generation nor the size of the ore lumps has an influence on the measuring results. Thanks to the noncontacting microwave measuring principle, the sensor is 100 % wear-free.
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Overfill protection with VEGACAP 65
In addition to the continuous level measurement, a second, independent sensor is applied. In ore silos that place such high demands on the stability of the measurement technology, the capacitive measuring principle is the right choice. Extreme robustness and easy set-up characterise the capacitive level switch VEGACAP 65. The four different pluggable electronics modules provide optionally relay contact (DPDT), transistor output (PNP/NPN), contactless switch, and twowire output for Ex applications. The switching condition of VEGACAP 65 is indicated on a two-color LED and is visible on the outside of the plastic housing.
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Mill discharge collecting container
In the extraction of gold, platinum and silver, ball mills are used to reduce the ore to a lump size that is suitable to the process. Water is used to protect the mills from overheating. At the same time, the water also prevents excessive dust generation. The spent water is discharged from the mill and collected in a special container. This container must be continuously monitored to limit the torque load on the motors and achieve optimal mill efficiency. The measured medium varies from plain process water to thick suspension. Foam, steam and buildup characterise this process environment.
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Level measurement with VEGAFLEX 61
Continuous level measurement in the mill discharge collecting container is realised with VEGAFLEX 61. The guided microwave principle defies the harshest application conditions imaginable. Due to its microwave technology, VEGAFLEX 61 operates completely independent of process conditions. The extremely easy set-up of the sensor requires neither a filling nor an emptying of the container. VEGAFLEX 61 is delivered factory-calibrated to the 0 and 100 % adjustment levels and provides accurate level data immediately after electrical connection.
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Level measurement with VEGAFLEX 62
If measuring lengths greater than 32 m (105 ft) are required, or if the mill discharge contains so much solid material that strong tensile forces act on the cable, VEGAFLEX 62 is the right choice.
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VEGAPULS 68
- non-contact measurement
- set-up without filling
- insensitive to strong dust generation
- wear-free
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VEGACAP 65
- robust sensor construction
- easy set-up
- insensitive to build-up
- cable can be shortened
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VEGAFLEX 61
- easy set-up
- insensitive to build-up
- variable cable electrode length up to 32 m (105 ft)
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VEGAFLEX 62
- easy set-up
- insensitive to build-up
- measuring probe can be shortened
- robust version for greater measuring lengths
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