Method for refrigerants, oils and refrigerant-oil mixtures; measurement range: -20 °C to 100 °C, vapor pressure < 140 bar.

Precise determination of electrical material properties under real pressure and temperature conditions – enables reliable assessments of the state and quality of refrigerants, oils and their mixtures.

This measurement method is used to determine the electrical properties of refrigerants, oils, and their mixtures as a function of pressure and temperature. These include, in particular, the dielectric constant, the alternating and direct current resistance, the specific volume resistivity, and the dielectric loss factor.

The measurements are carried out in a pressure-resistant, temperature-controlled measurement cell with a coaxial cylindrical design. The fluid under investigation is located in a defined annular gap between two electrodes, ensuring reproducible electrical measurement conditions. The dielectric constant, AC resistance, and loss factor are typically determined at a frequency of 1 kHz and a voltage of 1 V. The DC resistance / volume resistivity is measured under variable electrical loads in the range of 1 to 500 V.

The investigations are performed under controlled and reproducible conditions. The dielectric constant can be determined in the range of 1 to 20, while the DC resistance ranges from 1 kΩ to 1.6 TΩ. Based on the measured data, well-founded conclusions can be drawn about the electrical behavior and the condition of the fluids under investigation.