This question specifically concerns my issues with an ORP12 like:-
I've read the data sheet and I see that resistance changes wrt short time (15 sec). Also note 1 mentions 16 hours. But what happens after? Is it possible that the resistance could double (69k to 136k) over the course of a couple of weeks? I need this question answering in order to rule out other possibilities for my resistance change in an otherwise steady state system.