Answer Posted / leigh
In a differential pressure flow meter (orifice + DP Cell), pressure is measured before the orifice and after it. This pressure difference is used to measure the flow of the liquid in the pipe. If the pressure difference is more, the flow is more and vice a versa. The problem with this method is that the pressure difference is not proportional to the flow so if the velocity (flow) of the liquid increases, the pressure increases but at a different rate. If you were to plot this on a graph you would get a curve. This curve is not much good for auto control requirements. We have to make this curve straight or linear so that we can get a linear signal from the meter. A square root extractor is used to do this.
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