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Is that right? No wonder I get it I dialed in when the water starts it doesnt stop even when I submerge the sensor all the way. Im trying to use this on my cadlight 35g AIO so I stopped using itis it somehow getting turned on and off a lot? I have never had a problem but do hate how every time it gets turned off and on it drops a cup of water no matter what
Have you tried cleaning the optical sensor?
I'm given to understand that can help - something about bubbles adhering to it when it's brand spanky-new. (Mine pumped four gallons into the tank when I installed it early this week, but evaporation has now taken that out, and it's seemed to work well throughout today - the sensor's been under water for a few days, so I'm sure any new-bubbles issue is cleared up. We'll see how she goes down the line!)
~Bruce
I'm having similar issues. I purchased a tunze osmolator 3154 from brs. I installed it and ive noticed that the ATO will periodically start filling my sump even though the optical sensor is completely submerged. I dont let it get to the point where the backup valve gets triggered but its so far pumped 3 gallons in my sump in half a day when it usually takes a week to fill 3 gallons. Ive moved the optical sensor multiple spots in my return portion of the sump to no avail. ive unplugged it cause i dont want it to keep filling. when the optical sensor is completely submerged and i plug it back on, it doesnthe cupnand stops but then about an hour later, itnstarts filling again. I did notice some bubbles around the sensor. Should I just wait a few days until the sensor to attractnless bubbles? Thanks.A loop will not permanently solve a siphon and is not a recommended solution, an air gap is a possible solution, i.e. end the hose at an open top pipe that serves as a gutter to drain the water into the sump.
Scriptmonkey, if you email me more details I have a troubleshooting sheet I can send. I agree this is likely due to bubbles, the sensor only detects air vs water and is a bubble magnet for a few days, a hot soapy water rinse can help, reinstall it in a calm bubble free area, after a few days a bacterial film will greatly reduce the attraction of bubbles.
If it is new, the usual cause is the bubbles being attracted to the new plastic, the best solution is just to wait a few days for a biofilm to form on the optic sensor. Also, place the sensor away from sources of bubbles and this especially includes the top off hose which can go anywhere and should not be near the sensor. If you catch it in the act and wipe your finger under the sensor and the fill stops in 5 seconds, it is definitely due to bubbles.
If it continues doing this and it is about a year old, I would try cleaning the sensor in vinegar for a couple hours, just soak and wipe off with a soft towel, if it still continues, it could be the sensor is either failing or the sensor has drifted a little and needs to be recalibrated.