Hi all can any one tell me how Neptune is determining that it has an optical sensor plugged in over a water on floor sensor. Here is why I ask, I was having trouble with my RODI storage container I have a low level sensor and a high level sensor well when I configure it the low level goes back to a water on floor sensor. I called Neptune and yes they are sending a new sensor. But when the Auto detect is on it goes back to a water on floor sensor. I would assume they are just a switch witch in open or closed. So Neptune says it will not work properly if it was left like this with the auto detect off. Can anyone explain this to me. I asked the tech both on the phone and in writing and they say they do not have the technical aspects of these sensors