The pressure gradient developed across the diameter of a 1$quot; tube formed into a centrifugal flow-loop 10$quot; in diameter was not sensitive to changes in the consistency of paper pulp up to lgm per 100m1 of suspension. Thus such a device can serve as a volumetric flow rate sensor of dilute suspensions. The pressure gradient across a straight section of 3/4$quot; PVC pipe was found to decrease as the pulp content increased. A relation between pressure gradient and consistency was developed from which concentrations of high bright bleach pulp suspensions in the range from 0.5 to 1.1 gm per 104m1 can be predicted within about 100%. The possibility of controlling consistency with this method of detection is suggested.