Industry / Biogas and Energy
Differential pressure measurement in biogas plants
Biogas is wet, corrosive, and combustible. Hydrogen sulphide (H₂S), ammonia (NH₃), and saturated humidity attack electronic sensors within months. A ring balance separates the measuring element from the medium and stays stable over years — including in fermenter atmosphere, gas storage, and treatment.
A
Where the measurement is needed
- Fermenter overpressure: typically 2–5 mbar above atmosphere
- Gas storage: differential pressure between storage envelope and outside as a fill-level indicator
- Gas treatment: pressure drop across activated carbon and desulphurisation stages
- Feed-in stations: differential pressure across throttles and meters
- Cabinet ventilation: filter pressure in gas areas
B
Why a ring balance fits here
The typical loads — H₂S, humidity, organic constituents — would attack diaphragms, piezo elements, and capacitive sensors within months. With the ring balance, the medium contacts only the sealing liquid and the surfaces inside the ring body. The measuring element itself is encapsulated. Biogas areas are almost always ATEX Zone 1 or 2 — meaning the instrument itself must carry an intrinsic safety approval.
C
Technical parameters
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