APPARATUS FOR INSPECTION OF A FLUID AND METHOD

摘要

Apparatus for inspection of a fluid comprising: a channel portion, the channel portion having a channel inlet and a channel outlet separate from the channel inlet; a piezoelectric sensor element provided at a sensor position of the channel and arranged to contact fluid flowing through the channel portion from said channel inlet to said channel outlet, the apparatus being configured to determine a difference value being a value corresponding to a difference between a resonant frequency of oscillation of said piezoelectric element at a given moment in time and a reference resonant frequency.