Method for refrigerants, oils, refrigerant-oil mixtures, heat transfer fluids and aqueous solutions; measurement range: -10 °C to 125 °C, 0.5 mPa·s to 3,000 mPa·s, vapor pressure < 70 bar.

Reliable real-time characterization of liquids – enables indirect determination of density and concentration without sampling, even under demanding process conditions.

The measurement is carried out using ultrasonic sensor technology in a pressure- and temperature-controlled test setup. The liquid flows through a specially designed measuring section, where the speed of sound is precisely determined.

The investigations are conducted under defined and reproducible conditions. The evaluation of the measurement data is performed using suitable modeling approaches (e.g., polynomial models) to derive correlations between the speed of sound and properties such as density or concentration.