Introduction
Hydro cyclones are used for the classification on particles in slurries. Light particles are removed with the overflow stream by an upward swirling flow through the vortex finder, while heavier particles are removed with an underflow stream by a downward swirling flow.  The particle size of the cyclone feed slurry ranges from 250-1500 microns leading to high abrasion. The flow of these slurries has to be reliable, accurate and responsive to changes in the plant load. This enables to balance the plant load and plant throughput.  In addition to this, the service life of the flowmeter is essential to minimize maintenance and replacement cost. The flowmeter sensor has to withstand major abrasive wear caused by this kind of slurry as long as possible.
Advantage and challenge
Advantages:
• Electromagnetic flow meters with a ceramic liner and various choices of electrodes from ceramic to titanium or tungsten carbides can withstand corrosion, high noise environments which makes it ideal for Hydro cyclone systems.
• The advanced electronic filtering technology separates the signal from the noise without losing responsiveness to changes of the flow rate. 

Challenge:
The medium in mine industry has various kinds of particles and impurities, which makes the medium produce great noise when passing through the pipeline of the flowmeter, affecting the measurement of the flowmeter
Solution
The electromagnetic flow meters with a ceramic liner and ceramic or titanium electrodes are an ideal solution for this application with an added bonus of reducing replacement intervals significantly. The rugged ceramic liner material provides excellent abrasion resistance while the durable Tungsten carbide electrodes minimize signal noise. A protection ring (grounding rings) at the inlet of the flowmeter can be used to maximize service life of the sensor protecting the liner material from abrasion due to differences of the in inner diameter of the flowmeter and the connected pipe. The most advanced electronic filtering technology separates the signal from the noise without losing responsiveness to changes of the flow rate.
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