Effect of Rangeability & Maximum Flow Rate on Accuracy of DP Flow meters
If you use DP flow meters then you must read this article. It is often believed that DP flow meters have low rangeability typically 3:1. However, with continuous improvement in measurement technology especially pressure transmitters, this assertion is now a myth rather than reality. For DP flow meters, low rangeability means large errors at low flow rates since flow is proportional to square root of differential pressure. Rangeability and maximum flow rates are critical factors that should be well understood before you can accurately specify a DP flow meter or any flow meter for that matter. Having a good understanding of the two concepts can help improve accuracy and increase rangeability of a meter in a given application.
To have a thorough understanding of the effect of rangeability and maximum flow rate has on the accuracy of a DP flow meter, we need to understand the following terms;
(1) Rangeability
(2) Maximum flow
(3) Percent of flow range
To have a thorough understanding of the effect of rangeability and maximum flow rate has on the accuracy of a DP flow meter, we need to understand the following terms;
(1) Rangeability
(2) Maximum flow
(3) Percent of flow range
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