Abstract
This paper is concerned with the design and performance of a novel fluidic oscillator flowmeter which has been developed for domestic water metering applications. The flowmeter employs electromagnetic sensing of the oscillations. The paper discusses the possible locations of the sensor, the magnetic field and electrode structures which can be used, and estimates the signal strengths at the various locations. For the sensor configuration in the main jet it is shown that the signal strength is affected by the shorting caused by the stagnant fluid surrounding the jet, the velocity profile of the jet, and incomplete switching of the jet. It is shown that the sensor provides sufficient signal strength over the range of flows required for a class D Q n1 domestic water meter ( Q n1 = 1m 3h −1), for which the range of flows over which an accuracy is specified is from 2 ml s −1 to 0.55 l s −1.
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