Coarse and fine screens
Differential water level measurement for control of screen raking
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Process data
Measuring task:
Water level measurement
Measuring point:
Screen
Measuring range up to:
0 … 5 m
Medium:
Water
Process temperature:
+10 ... +30 °C
Process pressure:
0 … 0 bar
Special challenges:
Buildup, abrasion, foam
Application
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.
Your benefit
Reliable
Reliable control of screen cleaning
Cost effective
Non-contact and wear-free measurement
User friendly
Maintenance-free operation of the system
Recommended products
VEGAPULS C 21
The radar sensors measure the water level difference between the front and back of the rake screen
- Exact measuring results unaffected by ambient conditions
- High plant availability thanks to wear and maintenance free measurement
- Secure wireless operation via Bluetooth with smartphone, tablet or PC
Measuring range - Distance
15 m
Process temperature
-40 ... 80 °C
Process pressure
-1 ... 3 bar
VEGAMET 842
Controller for measured value processing and display
- Universal controller for two analogue sensors for differential measurement
- Analogue outputs for connection to process control systems
- Fast setup via simple menu navigation and application wizards
Protection rating
IP66/IP67, Type 4X
Input
2 x 4 … 20 mA sensor input
Output
3 x operating relay
1x failure relay (instead of operating relay)
2x 0/4 ... 20 mA current output
