Repeated visual monitoring
(through eye-check of the collection tank lid):
- Measure the quantity of gas generated per volume/weight of cow dung added. Cow dung is best collected when wet, thus the weight/volume would relate to the wet measure. This is to have an indication of the performance of the biogas plant e.g. xx weight/volume of cow dung produces yy volume/weight of biogas.
- Regular volume checks of gas available on a daily basis.