Which type of flow meter has an advantage due to having no critical surface dimensions that affect measurement accuracy?

The wedge flow meter is well-regarded for its design that eliminates critical surface dimensions impacting measurement accuracy. This flow meter operates using a wedge-shaped obstruction placed in the flow path, which creates a differential pressure that relates directly to flow rate. Because the geometry of the wedge does not present sharp edges or critical surfaces that could disrupt the flow profile, it maintains a level of accuracy that is less susceptible to the conditions that typically affect other flow meter types.

In contrast, other flow meters such as orifice meters rely on precise hole dimensions and can be influenced by changes in the fluid's properties or turbulence at edges, which can lead to errors in measurement. Cone flow meters and rotameters also have specific dimensional characteristics and flow patterns that can affect their accuracy under varying conditions. Hence, the wedge flow meter stands out for its capability to deliver reliable readings without being adversely affected by the meticulous details of its physical dimensions.