He having the same exact issue I am having that I posted about.

It does not matter if I place the sensor off my P4 onto the expansion Box, or use a new salinity probe the expansion box will alarm. His ADC2 values almost match mine.

sensor2_issue.jpg

No matter what sensor I place even a new one places the ADC Value over 1000. If I place the one off the expansion box back onto the P4 it shows a ADC value of 462.

This happened after I did the upgrade. Did you do the upgrade and this started to happen?