I suspect that I may have an optical sensor going bad on me. I purchased an ATK last summer (shortly after they came out) It was working fine, then shortly after installing my COR20, the upper optical sensor started funny (see this thread) Now a few days ago, the upper optical sensor started reading closed even though it was out of water and hadn't been covered (or even splashed) to my knowledge.
The sensor appeared clean, but I tried wiping it off with no change. I then unplugged it from the FMM and plugged it back in which fixed the issue.
The inputs on the FMM are manually set to optical sensor and autodetect is unchecked.
My potential theories are:
- wire cross-talk/interference (I have most of my optical sensor and probe wires bundled together (Edit: The power cable for the COR is separate from the sensor wires)
- Hardware/firmware issues with the FMM (it's updated with the newest firmware)
- A physical/mechanical issue with the optical sensor. I can't see anything obvious, but a small fracture in the wire insulation or the sensor housing could let humidity get in, causing a short.
At this point, the issue is very intermittent, making it difficult to tell what's causing the problem, but I also need to be able to rely on the system; an unreliable sensor is worse than having no sensor at all. Does anyone have any suggestions for troubleshooting this?
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