In compressed air, what is the concentration of oil content on behalf of liquid oil

In compressed air, when the oil content concentration reaches a certain level, it may indicate the presence of liquid oil. In particular, if the oil content concentration in the compressed air exceeds a certain threshold, this is generally regarded as an indicator of the presence of liquid oil. However, the specific concentration threshold may vary depending on different industry standards, application scenarios, or technical requirements. Therefore, when evaluating whether there is liquid oil in the compressed air, it is necessary to refer to relevant industry standards or technical specifications to determine the specific oil content concentration threshold.