Unfortunately this sensor is digital only, so you wouldn’t be able to discern much other than the presence of liquid I’d say. The second pin only serves to invert the output signal if needed:
Do glycerol and biodiesel have significant capacitance differences? If so you could potentially make this work with the right sensor positioning and threshold, but you’d know much more about the chemical side of things than us.
It appears that glycerol and biodiesel are both poor conductors. This site states that when dealing with non-conductive substances, the dielectric constant (d.c.) will influence the response of a capacitance sensor. Glycerol has a d.c. of 46.5 vs about 2 to 3 for biodiesel, so you may be able to adjust the sensitivity of your sensor to detect the difference in their d.c. properties.
Really good info, I can imagine it is able to check the level and change in state if it was tuned to only detect a shift in the constant. Though as its a digital only output, it would only really with tuning be able to measure the presence of whatever its tuned to at the time, so it would be interesting how that can be put into practice with the project @Sarah251245 has in mind.
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