Analysis of signals from vortex flowmeters

The vortex flowmeter is used to measure the flow of fluids especially where the requirements include wide rangeability and the use of flowmeters with no moving part. It is common knowledge that process conditions affect the operation of a vortex flowmeter, and a customary approach is to introduce flow conditioners so that the measurement output from a vortex flowmeter conforms to specified standards. Some recent studies have shown how to apply signal analysis to the signal from vortex flowmeters to enhance performance, but the signal which has been typically analysed is the pulse train. In this paper,we advocate a new approach which involves detailed analysis of the unconditioned signal from the sensor prior to conventional signal conditioning. The results obtained from this approach open opportunities for the development of alternative signal conditioners and transmitters which not only enhance the quality of the measurement output from a vortex flowmeter but also make it possible to use the flowmeter for monitoring the condition of the plant.