Precision chemical process flow meters

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In my field of fine chemicals, there are some reaction vessels that require water separation. The situation is as follows: in some cases, this can be handled using a conductivity meter, especially when there are significant differences in conductivity. We have also tried using density meters or mass flow meters to determine density differences for the purpose of water separation, but since the differences are relatively small, these methods aren’t very effective. In some cases, even during the layering process, there are partial mixed phases and emulsion layers, resulting in unclear interfaces; it is still necessary to rely on manual observation on site to determine where the separation occurs. I wonder if any of you have used other instruments for determining phase separation, such as those based on optical absorption spectroscopy or other methods