Are these acceptable salinity swings?

[wisnia99]

Hi all.
I have the Oceanic Creator 2
The issues is that the probes have a range when to add saltwater or DI water. As you can see on my apex there is a daily and sometimes by entire 1 point during 2 days.
There is no way to make it more stable. Do you think this is hurting my system? Are those swings to much?

Thanks!

 

[blaxsun]

My salinity varies between 0.1-0.25ppt in a 24-hour period, ie: 35.5-35.75ppt. Your salinity may actually be much more stable, but depending on where you're adding saltwater and RO water, it may be mixing differently. I think as long as it's generally staying the same you're fine (0.5ppt fluctuations in a day aren't a big thing).

 

[marinesnow]

Those look like temperature influenced fluctuations to me. You may need to set up the TC factor on your Apex to give you more steady readings. This was the solution for me.

(Almost) Everything You Need to Know About Apex Salinity Calibration and TC Factor

I was trying to calibrate my new salinity probe a few weeks ago, and ran into all sorts of problems. Calibrations that were way off the mark, big fluctuations in readings that couldn't possibly be correct (and were verifiably not), etc. After searching around the internet, it was clear that a...

www.reef2reef.com

To answer your question, I don’t think those swings will cause an issue IME, but it’s unlikely that you’re actually swinging that much. You may want to verify that with another salinity measuring device (i.e. refractometer)

 

[bushdoc]

I am almost sure that your sg/salinity is stable, it is just variations and measuring error of conductivity probe. My probe measures large variations over 24h period, but when I check sg with Tropic Marin Hydrometer, there's almost no variations in a week cycle.

 

[Randy Holmes-Farley Verified Community Expert]

I agree those are likely temp fluctuations causing interference in a salinity determination by conductivity that is not properly corrected for temperature (it must be). Maybe you have that setting turned off, or set to an incorrect value.