Thermal flow meters / switches are based on the thermal dispersion principle, a principle that describes how a heated body cools when a medium passes.
If the principle is to be used for flow measurement, it is done by controlling the heating of a body in the medium, as the heating is controlled so that there is always a constant difference temperature with an identically designed reference outside the medium, then the power to be used for heating will be proportional to the mass flow of the medium.
Thermal flow meters / switches are based on the thermal dispersion principle, a principle that describes how a heated body cools when a medium passes.
If the principle is to be used for flow measurement, it is done by controlling the heating of a body in the medium, as the heating is controlled so that there is always a constant difference temperature with an identically designed reference outside the medium, then the power to be used for heating will be proportional to the mass flow of the medium.