ABSTRACT
Impeller owmeters, sometimes called paddle wheel meters, are one of the most commonly used owmeter variety. e impeller ow sensor is a direct oshoot of the old-fashioned undershot waterwheel. ey are a cost-eective alternative to turbine meters and can be used in applications that are dicult to handle with other types of ow metering instruments. In their mechanical construction, they are usually very simple, with any sophistication residing in the electronics used to detect the rotation rate of the impeller and in the choice of materials of construction for chemical corrosion attributes of the metered uids. ey are related to turbine meters in that both types use a rotating mechanical element to produce the output signal. ey dier in the fact that the impeller meter has its rotary axis transverse to the ow stream, as opposed to the turbine meter axis, which is parallel thereto.
