02-14-2022, 06:35 PM
Interesting, the pH circuit is essentially a very delicate volt meter, it reads millivolts which is converted using a math formula to a pH value, this is why it's so sensitive.
I have an idea, I was thinking you had v1 controller, sorry I keep thinking you are someone else, you have v2. I was thinking I mounted the BNC connector on the controller board as I was doing that, I did make a small error on that board which caused a ground loop and caused the pH circuit to read 7 no matter with or without a probe, it was unusable. To work around this is was a simple matter of not soldering the 2 small pins on the BNC. Although you are experiencing something very different I wonder if it's related. Are those pins welded? If so do you think you can remove the solder from them?
Another possibility is static buildup when you unplug and plug back in but I'm not sure how a reboot would eliminate it. At this point I don't think it's probe especially as you have replaced it, I think it has to be electrical noise or something with the board.
I have an idea, I was thinking you had v1 controller, sorry I keep thinking you are someone else, you have v2. I was thinking I mounted the BNC connector on the controller board as I was doing that, I did make a small error on that board which caused a ground loop and caused the pH circuit to read 7 no matter with or without a probe, it was unusable. To work around this is was a simple matter of not soldering the 2 small pins on the BNC. Although you are experiencing something very different I wonder if it's related. Are those pins welded? If so do you think you can remove the solder from them?
Another possibility is static buildup when you unplug and plug back in but I'm not sure how a reboot would eliminate it. At this point I don't think it's probe especially as you have replaced it, I think it has to be electrical noise or something with the board.
