VIBRATION-TYPE DENSITY METER, AND AIR BUBBLE ENTRAINMENT DETERMINATION METHOD IN VIBRATION-TYPE DENSITY METER

摘要

Provided is a vibration-type density meter which can detect air bubbles entrained into a sample cell without repeatedly introducing a measurement target sample to the sample cell.　This vibration-type density meter 1, which measures the density of a measurement target sample stored in a sample cell 10, comprises: an excitation means 20 for exciting vibrations to the sample cell 10; a measurement means 30 for measuring a vibration period of the excited sample cell 10; a drive control means 80 for driving the excitation means 20 with a first driving force and with a second driving force lower than the first driving force; and a determination means 90 for determining the presence or absence of air bubbles inside the sample cell 10 on the basis of a difference between a first vibration period of the sample cell 10 excited with the first driving force and a second vibration period of the sample cell 10 excited with the second driving force.