An ultrasonic device was calibrated to measure in situ and in real time the POE oil concentration of the refrigerant liquid R 410A. The first part of this paper is devoted to the properties of the mixture, to the effects of the presence of oil on the speed of sound propagation and to the calibration and validation procedures carried out with a saturated liquid refrigerant. Indeed, in order to have a number of calibration points that is not too large, it is necessary to maintain the mixture as close as possible to saturation conditions, which is constraining for the choice of the location of the sensor on the installation investigated. In the second part, the first results obtained on this installation are presented. It appears that the speed of sound in the POE / R 410A mixture is a strong function of the temperature and of the oil concentration, as was expected, but it also significantly depends on the pressure. Consequently, if the use of a sensor in a sub-cooled area is considered, additional calibration and validation procedures are necessary.
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机译：超声设备经过校准，可以现场并实时测量制冷剂液体R 410A的POE油浓度。本文的第一部分致力于混合物的特性，油的存在对声音传播速度的影响以及使用饱和液态制冷剂进行的校准和验证程序。实际上，为了使校准点的数量不太大，必须将混合物保持在尽可能接近饱和条件的位置，这限制了传感器在所研究设备上的位置选择。在第二部分中，介绍了在此安装上获得的第一个结果。像预期的那样，POE / R 410A混合物中的声速似乎是温度和油浓度的强函数，但它也很大程度上取决于压力。因此，如果考虑在过冷的区域中使用传感器，则需要额外的校准和验证程序。
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