Tunze Osmolator mysterious overfill

[Billldg]

I found out my salinity was low because I didn't calibrate my refractometer, so over the next week or two I raised my salinity from 1.023 to 1.026 by adding salt water to my ato and thru water changes. I finally got my salinity ro 1.026 and my parameters were I wanted them. Did a 30 gal water change this weekend and then took out the salt water in my ato and added 10 gals of ro/di water with kalk. Everything is good until I get home and find out my ato dumped 3 gals of kalk water in my tank raising my ph to 8.6. So I had to do another 25 gal water change to tag and lower my ph to something respectable. Their was no reason why my tunze 3155 should have added water to my tank. It's only been in my tank for a little over a month. I am partially to blame as I raised the secondary float up a little to keep it from going off everytime I turned off my return pump to feed my frags, but still, is their a flaw in the setup. Having to use a secondary float to back up the sensor because the sensor isn't reliable to begin with, do I need to add a 3rd back up. If I am doing something wrong please let me know. If their is something else I can do please let me know. Yes the sensor eye is clean.

 

[miPapareef]

How many times a day do you cycle power to the osmolator? And have you adjusted the flow rate up or down? The power cycle can come from your secondary level switch also.

The reason I ask is because every time power is reapplied there is a minimum run time for the pump and it will over fill above the primary sensor level. If you continuously break power and reapply it will continuously fill.

Also you can turn down the flow rate of the pump so that the minimum run time on power up does not over flow the sensor. You have to do this inside the osmolator control box.

 

[Billldg]

How many times a day do you cycle power to the osmolator? And have you adjusted the flow rate up or down? The power cycle can come from your secondary level switch also.

The reason I ask is because every time power is reapplied there is a minimum run time for the pump and it will over fill above the primary sensor level. If you continuously break power and reapply it will continuously fill.

Also you can turn down the flow rate of the pump so that the minimum run time on power up does not over flow the sensor. You have to do this inside the osmolator control box.

I don't cycle the power on my tunze, I originally had the flow rate turned to nano because I was worried about it overfilling before the timer kicked in, but since I had adjusted it to the mid level flow rate. Yesterday it raised the water level in my sump roughly 2 inches above the optic sensor. I ended up lowering the secondary float back down to just above the sensor and I will just deal with the alarm going off when I turn off my return pump. May just start 2 part dosing also. Thanks for your input, every little bit helps.

Silver lining is I get home today, and maybe it's because I have change roughly 55 percent of the water over 3 days, but my frags look the happiest they have ever had, lol!