A unique advantage of the laminar flowmeter is its linear relationship between flow rate and
developed pressure drop. It is the only pressure-based flow measurement device for filled pipes
that exhibits a linear pressure/flow relationship. This means no “square-root” characterization
is necessary to obtain linear flow measurements with a laminar flowmeter. The big disadvantage
of this meter type is its dependence on fluid viscosity, which in turn is strongly influenced by
fluid temperature. Thus, all laminar flowmeters require temperature compensation in order to
derive accurate measurements, and some even use temperature control systems to force the fluid’s
temperature to be constant as it moves through the element