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Level measurement and point level detection of foam in the digester

Process data

Measuring task:
Level measurement and point level detection
Measuring point:
Digestion tank
Measuring range up to:
0 … 7 m
Sewage sludge
Process temperature:
+10 ... +60 °C
Process pressure:
+1 … +5 bar
Special challenges:
Foam, buildup, gas overlay


The organic components of sewage sludge are decomposed under anaerobic conditions in heated, closed digestion tanks. In the process, combustible gases such as methane are released from the sludge. These are collected in a biogas tank and then converted into electricity and heat in cogeneration (CHP) plants. A level sensor controls the filling of the digester. To ensure that no foam gets into the gas system along with the collected gas, a point level sensor is used for monitoring.

Your benefit

Reliable level measurement and protection against foam overfill
Cost effective
Continuous, maintenance-free operation of the digester
User friendly
Low maintenance costs and reliable gas production

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Industry brochure

Level and pressure instrumentation for wastewater treatment