MONITORING PHYSICAL PROPERTIES OF A FLUID

摘要

An impeller (4) on a stirrer shaft (3) is rotated at constant angular velocity by a motor (12) within a chamber (1 and 2). Vibrations induced in the shaft (3) by virtue of the stirring action of the impeller (4) are sensed by a transducer (5) whose output is conditioned by equipment (6) to provide signals representing vibration of the shaft (3). Analysing equipment (7) infers conditions within the chamber (1 and 2) from these signals. The invention can be applied to processes in a reaction vessel and liquid in a pump chamber. Since the excitation is a constant angular velocity and the induced effect is vibration, there is no interference between excitation and induced effect although the transducer (5) is mounted on the stirrer shaft.