In general, it can be said that the design of the measuring point is of enormous importance. Devices with a large dynamic measuring range have the advantage that they can be used in a wide variety of applications. However, it must be noted that these sensors have a higher inaccuracy in the lower measuring range. If an application requires a high measuring accuracy over a low flow variance, a sensor version should be selected whose measuring range comes as close as possible to the expected flow. When comparing the accuracy specifications of the SM and SU series with the same process connection (e.g. 1") and a similar final value of the measuring range (SM: 250 l/min vs. SU: 240 l/min), it becomes clear that the percentage of inaccuracy of the SU series is higher in the low measuring range, before the accuracy steadily improves over the further measuring range. Figure: Deviation of absolute accuracy in percent when comparing SM8130 (blue line) and SU8020 (orange line)