The 430 x 430 mm chamber, providing a volume of 27.7l, was developed to avoid highly back diffusion of gas during surface-exhalation measurement.
To make the bonnet suitable for a huge variety of different types of surfaces (soil, rock, concrete) it is equipped with an easy removable rubber lip and therefore gurantees a hermetic closure.
Stainless-steel as the one and only material used for construction avoids unwanted artefacts and the quick-lock coupling allow the bonnet’s fast and easy installation. A homogenous gas distribution within the bonnet is either ensured by a plate between air inlet and outlet or (on request) by a mixing fan (for measurements without permanently pump flow).
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