I am having a problem with Aquapal iii. The vessel would turn very dark after a while. I have tried many solutions but it won't help.
For example, cleaning the glassware, inspecting the detector electrode and connections look fine.
This is believed to happen after introducing benzo- containing oil.
What else should I look into?
I read but how to tell if the electrode cable and cable connectors are dirty, wet and corroded?
Anyone has any experience with it?