Our ultrasonic sensor system for determining the acoustic properties o
f liquids allows the direct and continuous observation of processes in
the chemical or food industry. The principle and features will be des
cribed. An important point for reliable and exact measurement of ultra
sonic absorption is the influence of geometrical construction and mate
rial properties of ultrasonic sensors on forming the receiver and echo
signals. Some examples show advantageous use of ultrasonic sensor sys
tems.