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"Detect Water x Air in a pipe"

Blog entry posted in 'Sensing', Jul 10, 2017.

Hi All,
I have a problem that I need a help from you. I'm designing a system that monitors a pipe. In this pipe sometimes there is airflow, sometimes water. If air is detected, a valve should close. If it's water it should open. However, I'm not being able to find a way to clearly detect the different flows.
Any Ideas?
Please help.