DIY Automated salt water mixing system

[kien]

Originally Posted by sphelps

Mine seems pretty stable as every time I check it matches my refractometer but I measure salinity rather than specific gravity as I recall issues in the past relating to programming the controller to display readings in SG, something about a gravity offset calculation or something, can't remember. Anyway you should try recording the actual conductivity over time and see if that is changing before ruling anything out.

hmm, good to know! I'll look into that. Thanks!

[sphelps]

Also try re-calibrating the probe, if it's faulty it probably won't calibrate at lowest tolerance. Check to make sure the cable isn't picking up interference from other electrical lines as well, ie shut everything off except the controller and see if the conductivity is effected.