This was the case for [Rob] and his Porsche 944, which had relied on an old-fashioned mechanical air flow meter (AFM). He decided to replace this with a modern mass air flow (MAF) sensor instead ...
Measuring air flow in an HVAC duct can be a tricky business. Paddle wheel and turbine flow meters introduce not only resistance but maintenance issue due to accumulated dust and debris.
One thermal flowmeter measures the waste gas flow, while the other four thermal flowmeters provide submetering of this gas stream to each boiler. Another four meters measure preheated (200°C, 392°F) ...
The Selectaflo HP is a flowmeter-pressure regulator. It is installed on medical gas cylinders to guarantee that the desired flowrate is deliverd to the patient, regardless of the upstream pressure.