Measuring air flow in an HVAC duct can be a tricky ... like with this ultrasonic flow meter, could be a big deal for DIY projects and the trades in general. The principle behind the sensor ...

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This was the case for [Rob] and his Porsche 944, which had relied on an old-fashioned mechanical air flow meter (AFM ... both devices in series, and measuring their output on an oscilloscope.

It is possible to calculate the mass flow rate by detecting the phase shift of the tubes. This mass flow meter also helps measuring the temperature, which is then used for compensation.