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Thread: Salinity probe readings

  1. #26
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    Quote Originally Posted by M1k3 View Post
    Maybe I got lucky. After initial calibration my apex is reporting a matching reading to my refractometer. However I am in the early stages of recovering from a low salinity situation (19ppt) I wonder how close it will be at 35?


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    Mine shows 37 ish which last time I checked my tank was right on 1.026 with a calibrated refractometer however I'll have to test again the salt when I have time.

  2. #27
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    Quote Originally Posted by RussM View Post
    Colorado, please do not post about the same issue in multiple places. This is called crossposting which is generally frowned upon. I replied in your other thread.
    What other post Russ can you please provide a link. I'm getting inconsistent values as well thanks

    Refrac reading did from apex ty

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  3. #28
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    Quote Originally Posted by Scubabermuda View Post
    What other post Russ can you please provide a link.
    To find other threads and posts by a user, click on the username then choose the desired search option from the choices on the left.
    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.

  4. #29
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    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

  5. #30
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    Quote Originally Posted by rygh View Post
    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
    I thought the same.. same thing. Works better after a film build on the probe maybe? Recalibrated after a few weeks. It's been almost dead on with the refractometer ever since.

  6. #31
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    Quote Originally Posted by Scott.h View Post
    I thought the same.. same thing. Works better after a film build on the probe maybe? Recalibrated after a few weeks. It's been almost dead on with the refractometer ever since.
    I think a recal is due personally..

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  7. #32
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    Quote Originally Posted by Bvoss View Post
    I just gave up and changed the compensation value on the probe web page until it matched what my calibrated refractometer was telling me. All I really want the salinity probe to do is tell me if the salinity changes. It does that really well.


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    Bvboss,

    Can you tell me how exactly I can do this on the dashboard? Do I have to hook my Apex up to my computer or can I do it via my mobile phone. Many thanks

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  8. #33
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    Refrac shows 35 PPT Apex is at 34.1

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  9. #34
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    Might I add when I first got my new Apex approx 4 months ago the refrac and Apex were dead on the same

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  10. #35
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    For good measure I did recalibrate the probe same results

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  11. #36
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    Quote Originally Posted by Scubabermuda View Post
    I think a recal is due personally..

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    I agree

  12. #37
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    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?

  13. #38
    Regular Vistor mkeller088's Avatar
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    9:00 pm—-holding 34.9 ppt moved a little today to 35 ppt.

  14. #39
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    You probably have micro bubbles collecting on the probe.


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  15. #40
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    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.

  16. #41
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    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?

  17. #42
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    Quote Originally Posted by MikeyG View Post
    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.

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  18. #43
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    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?

  19. #44
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    Quote Originally Posted by MikeyG View Post
    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?
    Depends on what it reads in the return chamber.

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  20. #45
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    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?

  21. #46
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    Quote Originally Posted by MikeyG View Post
    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.

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