I've been chasing my tail over this issue for a few months.
I've got a Red Sea Max 250 with an Apex controller w/a salinity probe and an ATO.
I've been watching my salinity swing from 33ppt to 35ppt (ideal is 35ppt).
Whenever I see it drop, I check the Salinity with my refractometer and sure enough, regardless of what Apex is saying, it's setting right at 1.026 (35ppt).
WTH...
I've been racking my brain over this.
I know that there is an issue with the probe cables not running side by side. Keep them at a 90 degree crossing if they must, etc...
I've made sure that all the probe cables are as far away from one another as possible. At the closest point, they are within 3 inches of each other. This is right at the control boxes. Not alot I can do about that.
Then last night, I was checking the skimmer and I noticed that my ATO feed line had shifted and was feeding fresh water right into the area that the over flow goes into. My salinity probe sits almost directly behind the over flow.
Doh!! :blush:
Every time the ATO kicks in, the Apex reports that the salinity has dropped. Then shortly after, the salinity goes back up (according to the Apex).
Now...if I try and calculate how much time I've spent trying to figure out this riddle, I'll lose what's left of my mind. :sick:
I've got a Red Sea Max 250 with an Apex controller w/a salinity probe and an ATO.
I've been watching my salinity swing from 33ppt to 35ppt (ideal is 35ppt).
Whenever I see it drop, I check the Salinity with my refractometer and sure enough, regardless of what Apex is saying, it's setting right at 1.026 (35ppt).
WTH...
I've been racking my brain over this.
I know that there is an issue with the probe cables not running side by side. Keep them at a 90 degree crossing if they must, etc...
I've made sure that all the probe cables are as far away from one another as possible. At the closest point, they are within 3 inches of each other. This is right at the control boxes. Not alot I can do about that.
Then last night, I was checking the skimmer and I noticed that my ATO feed line had shifted and was feeding fresh water right into the area that the over flow goes into. My salinity probe sits almost directly behind the over flow.

Doh!! :blush:
Every time the ATO kicks in, the Apex reports that the salinity has dropped. Then shortly after, the salinity goes back up (according to the Apex).
Now...if I try and calculate how much time I've spent trying to figure out this riddle, I'll lose what's left of my mind. :sick: