He’s using an eTape sensor to measure the water level in the reservoir, but he ALSO is using a flow meter in the line itself to double-check that the reservoir won’t overflow.

Being able to measure ducted airflow cheaply and non-intrusively, like with this ultrasonic flow meter, could be a big deal for DIY projects and the trades in general.

KROHNE Inc. now offers the OPTISONIC 7300 Biogas ultrasonic flowmeter, specially designed to measure dry and wet biogas with variable composition.

Using advanced digital signal processing (DSP) technology, the M-2300 Series integrates an inline ultrasonic flow sensor and electronics into a single compact unit.

The ultrasonic flowmeter measures simultaneously flow and molar mass of the mainstream gas. Ventilation distribution was studied using moment ratios analysis (alveolar-based mean dilution number).