What is true about in-line fixed-flowmeters?

In-line fixed-flowmeters are designed to measure the flow of fluids within a pipeline while ensuring that the measurements are as accurate as possible under normal operational conditions. The correct answer indicates that these flowmeters may encounter challenges when used with less viscous products, particularly powders and slurries. This is because less viscous materials can behave unpredictably, and the flowmeter may not function effectively due to the nature of how these products can move and settle within the pipe. Such materials often require specialized flow measurement solutions that take account of their unique properties—something that fixed-flowmeters may not effectively manage.

In comparison, the other statements pertain to misunderstandings of flowmeter characteristics or limitations. The claim that they are the least accurate flow measurement devices overlooks the fact that while some flowmeters may be less accurate than others, in-line fixed-flowmeters can provide reliable measurements for many applications. Stating they are only used in non-pressurized systems is misleading, as these flowmeters are also applicable in pressurized conditions. Lastly, the notion that they do not interfere with the flow of any material is misleading, since any flow measurement device will typically affect flow dynamics to some degree, especially in cases involving various fluid types. Therefore, focusing on the behavior of