Novel Sensor for the Measurement of Entrained Air in Pulp Suspensions, 2000 Pulping / Process & Product Quality Conference Proceedings
S. J. Dougherty--A new solid-state sensor allows for the in-situ measurement of entrained air in process fluids by means of fluid compressibility. A compression piston, equipped with a flush-diaphragm pressure sensor in the end, is rapidly moved into the process fluid over a distance of less than 0.005" (140 microns) over a time of less than 200 micro seconds. The inertia of the fluid resists this rapid motion, so that the local fluid adjacent to the end of the piston is compressed. The resultant pressure pulse is inversely proportional to the entrained air content. This inexpensive sensor provides accurate on-line entrained air measurements from 0.05 to 50%. Applications typically include automated defoamer control in pulping and machine operations.
Novel Sensor for the Measurement of Entrained Air in Pulp Suspensions, 2000 Pulping / Process & Prod
