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Coarse and fine screens

Level
Coarse and fine screens

Overview

Mechanical cleaning removes entrained floating matter with screens or sieves. This protects the downstream process stages from buildup, clogging and abrasion. Solids with diameters greater than 25 mm are trapped in the coarse screens, compressed in a press and then disposed of. Finer secondary screens remove smaller residual materials. Measurement of the difference in water level between the front and the back of the screen determines the degree of contamination and initiates the cleaning of the screen when necessary.

Operating Conditions

Measuring Task
Water level measurement
Measuring Point
Screen
Medium
Water
Measuring Range
0 … 5 m
Temperature
+10 ... +30 °C
Pressure
0 … 0 bar

Challenges

  • Buildup, abrasion, foam

Benefits

  • Reliable: Reliable control of screen cleaning
  • Cost effective: Non-contact and wear-free measurement
  • User friendly: Maintenance-free operation of the system

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