Please do not send me PMs with technical questions or requesting assistance - use the forums for Apex help. PM me ONLY if the matter is of a private or personal nature. Thanks.
Update on my issues (see post above where it weirdly reported high)
After several weeks, salinity slowly dropped down.
Don't know why. Nothing changed.
My only theory was some sort of residual manufacturing chemical on the probe that dissolved eventually.
It now reads pretty consistently from 34.6 to 34.9
Refrac shows 35 PPT Apex is at 34.1
Sent from my Pixel XL using Tapatalk
Might I add when I first got my new Apex approx 4 months ago the refrac and Apex were dead on the same
Sent from my Pixel XL using Tapatalk
For good measure I did recalibrate the probe same results
Sent from my Pixel XL using Tapatalk
Just an observation worth mentioning.
After calibrating my refraction meter and probe many times over yesterday, I found these truths. Refractor can change from 1 min to the next I use pinpoint 35ppt.
After finally getting satisfied with the repeatability and resetting my probe to defaults, Then calibrating it for the 5th time I got them reading within .2 ppt. Yay!
34.9ppt.
I noticed hours later it was dropping slowly. Like it was settling. 33.2ppt. I flicked it a few times in the sump and instantly back to 34.9. Air bubbles? Maybe.
Woke up this morning with 30 ppt!! Checked with the refractor and 34.9 ppt. Hmmmm.
Turned probe upside down in sump and got 51 ppt. Total confusion. Returned it to it’s in sump holder, flicked it a few times for bubbles, and presto!! 35.1 ppt. It’s been holding for about an hour now. Flicking it definitely helps bring it to normal, but strangely it’s in a low flow no bubbles area of the sump.
I’ll post back tonight. Keep in mind it’s a new probe. Maybe a break in period?
9:00 pm—-holding 34.9 ppt moved a little today to 35 ppt.
You probably have micro bubbles collecting on the probe.
Sent from my iPhone using Tapatalk Pro
35.1 this morning. Microbubbles is all I can think of. Bubbles I can’t see. Perhaps a slight slime coat on the probe will prevent that. We will see. So far everything is holding fast.
Keep in mind it is a brand new probe, and bubbles tend to stick to clean plastic surfaces just like a skimmer.
Thanks guys for starting this thread.
I am a new APEX Fusion user, and have many of the same questions/concerns.
1st off, I am not sure I understand the Apex numbering related to salt readings.
I successfully calibrated the Apex probe, and it's reading 20.7. My refractometer is reading 1.022.
Can someone help me make sense of this please?
Assuming your refractometer is actually calibrated, you should get a number near 30 ppt. The apex is extremely picky about how you calibrate the probe. If the packet temp doesn't exactly match tank temp or there are any bubbles in the probe during the wet step, it will fail miserably and give you a garbage calibration.
Sent from my SM-G965U using Tapatalk
I think you might be on to something here.
The salinity probe is in a high flow area in my sump that has a lot of large, and micro bubbles.
I will relocate it to the return chamber that's free of bubbles.
Will I need to re-calibrate the probe for accuracy?
So, how does the Apex numbering scheme relates to the SP from my refractometer?
IE, does 30 on the Apex converts to a corresponding SP on my meter?
The apex measures in parts per thousand of Salinity. 30 ppt is roughly equivalent to 1.022 specific gravity and 35 ppt is equivalent to natural sea water or about 1.026 SG.
PPT is the better and more accurate measurement because it makes calculations easier and it is less susceptible to error from changes in ALK, Ca, and Mg.
Sent from my SM-G965U using Tapatalk
Bookmarks