Intermittent Neptune ATK Issues

[UnnamedReef]

Having trouble with my ATK intermittently. Looking for troubleshooting guidance.

Setup:
- 55 gallon w/Eshopps external overflow (U tube style)
- Apex EL, EB832, Trident, FMM, Standard Neptune ATK (two optical sensors, provided bracket, tubing, PMUP, etc)
- Standard ATK programming code from the wizard applied to 24v EB832 output.

Monitoring my conductivity probe and seeing dilution intermittently, about once a week. Last night specifically I was seeing off/on ATK high switch alarms, but no conductivity shift, so I turned off the 24v output for the PMUP, just in case.

This morning I wake up and find the conductivity dropped from 36 to 35. I don't see how/why that would happen with the PMUP powered down. Especially with the alarm being on the entire time. I took the PMUP out of the ATO reservoir so it can't mis-behave anymore temporarily.

Am I looking at an intermittent optical switch issue, EB832 mis-behaving, or maybe FMM issue? Logs attached. Thanks everyone.

 

[RoanokeReef]

I wouldn't put any thought into the conductivity probe dropping 36-35, they are notoriously in accurate. They can drop or increase due to temp,electrical interferance,bubbles and the wind blowing from the east.

 

[RoanokeReef]

As far as the high alarms, have you cleaned the sensors recently? Also if you're using it make sure the pin hole in the syphon break is clean. Thats where I would start. Other things to look at and make sure they're clean is the return pump and weir teeth.

 

[UnnamedReef]

I normally don't pay too much mind to conductivity flux but when I see it's because of excess water being added I do pay attention.

I did clean the sensors. No siphon break hole, my sump is sized to accommodate powering down without one. I cleaned the U tube and weir teeth, seems to be draining ok.

Thank you for the help

 

[RoanokeReef]

The siphon break isn't related to a power down and sump size. It used to break a siphon from your ATO reservoir when filling depending on the location of your reservoir in relation to your sump to prevent overfilling.

 

[UnnamedReef]

I thought you were talking about a tank return siphon break in the display tank sorry.

I didn't know the ATK had a siphon break but looking at the manual it seems that very well could be my issue. Thank you! I'll give the siphon break cleaning a shot