Digester
Level measurement and point level detection of foam in the digester
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Process data
Measuring task:
Level measurement and point level detection
Measuring point:
Digestion tank
Measuring range up to:
0 … 7 m
Medium:
Sewage sludge
Process temperature:
+10 ... +60 °C
Process pressure:
+1 … +5 bar
Special challenges:
Foam, buildup, gas overlay
Application
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
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
Recommended products
VEGAPULS 6X
Level measurement with radar for control of the filling process
- Maintenance-free operation through non-contact measurement
- Accurate and reproducible measurement data, independent of gas concentration and pressure fluctuations
- Reliable measurement, even with foam and density changes
- Wireless operation via Bluetooth with smartphone, tablet or PC
Measuring range - Distance
120 m
Process temperature
-196 ... 450 °C
Process pressure
-1 ... 160 bar
VEGACAP 64
Detection of the conductive foam prevents it from entering the gas facility
- Reliable foam detection, even with different foam consistencies
- Unaffected by contamination and buildup
- Simple mounting and setup
Measuring range - Distance
-
Process temperature
-50 ... 200 °C
Process pressure
-1 ... 64 bar
VEGATOR 141
Double channel signal conditioning instrument for level detection
- Simple adjustment of the switching point through a potentiometer
- Clearly visible switching status via LED
- Simple installation through carrier rail mounting as well as detachable, coded terminals
Protection rating
IP20
Input
1 x 4 … 20 mA sensor input
Output
1 x operating relay (SPDT)
Optionally 1 x fail safe relay output (SPDT)
VEGATRENN 141
Separator for the optimum supply of power to the connected sensors
- On-site diagnostics for direct display of status via LEDs
- Simple parametrization interface using the HART sockets for user-friendly operation
- Galvanic separation of sensors and PLC is secured
Protection rating
IP20
Input
1 x 4 … 20 mA/HART sensor input
Output
1 x 4 … 20 mA
