Turning capacitive water level sensor into salinity sensor?

Other Hardware Sensors
1

Hi all,

I have been using a non-contact capacitive sensor to detect water level for my project (using the sensor XKC-Y26-V). I have a brief idea of how the sensor makes use of the changes in dielectric capacitance to detect a signal - I am just wondering given that capacitance should vary with conductivity of the liquid medium - is there any ways/approaches to hack the sensor so that I can also quantify the salinity?

The sensor outputs a digital signal - I try to analogRead() the signal (using Arduino UNO) with tap vs salted water but seems the reading are very similar and the two cannot be really discriminated ...

THANKS!!

2

That sensor is more like a level switch. It reacts to water being present or absent; the output is high or low, nothing in between.

As far as I know you can't use capacitive methods to measure salinity to begin with. The common way is to measure the resistance of the liquid using a high frequency AC current.