Pretty comfortable with my ORP probe in my display, it reacts as it should etc. In a bid to start to automate my No3 reactor i want to set it up in the normal way with an ORP probe reading the values inside the reactor that then triggers a water feed (peri pump) Switched over the ORP probe to my reactor and as expected the values soon dropped to zero, but not lower and after quite some time when i would of expected the values to actually be in negative they are still at zero and i wondered if they are indeed below zero but Apex some how could only display the lowest value it has ie ZERO.
Does anyone know if Apex can display negative ORP values ? I need a trigger point at -170mv
Thanks
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