If you can calibrate your temperature probe - you probably should.

Discussion in 'Reef Aquarium Discussion' started by TinyChocobo, Mar 8, 2018.

  1. TinyChocobo

    TinyChocobo Well-Known Member R2R Supporter Build Thread Contributor

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    I checked my water temp next to my Apex Temp Probe with a NIST Certified +/- 0.4 Degree Fahrenheit thermometer as well as two other thermometers and came out with an average reading 1.5 degrees lower than the Apex was reporting.

    I trust the NIST Thermometer to be closer than the Apex out of the box due to the NIST Certification that my thermometer carries [and is still valid].

    This means effectively that when I had set my aquarium to run at 78 degrees it was really running 76.5 which is a bit on the low side.

    Granted I'm likely still not exactly 100% accurate - but I'm going to be much closer than I was. I turned down my temperatures a bit and will up the temperature from 76.5 to 78 over the next 12 hours or so as not to have a sudden change.
     
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  2. TinyChocobo

    TinyChocobo Well-Known Member R2R Supporter Build Thread Contributor

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    That said... the calibration of the PH probe uses the temperature probe... I'm thinking the calibration of my PH probe is likely off at this point...
     
  3. TinyChocobo

    TinyChocobo Well-Known Member R2R Supporter Build Thread Contributor

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    Yeah 0.21 drop in PH reading by calibrating the temperature probe up 1.5 * F. Looks like I need to order some PH Solution.
     
  4. justingraham

    justingraham Valuable Member R2R Supporter R2R Excellence Award Build Thread Contributor Partner Member 2018 NJRC Member

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    I have checked my tank with like ten different thermoters
    three apex probes
    one Mack for Ac ducts
    one multimeter
    one hand gun
    Three glass ones
    And my heater thermostat

    None was the same all about a half degree difference so I don’t know what it is

    But in all that
    I’m more worried about the consistency
     
  5. TinyChocobo

    TinyChocobo Well-Known Member R2R Supporter Build Thread Contributor

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    A half degree range is fine/good imho especially if they all report it. Everything *but* my apex was reporting 1.5 degrees lower than the Apex - not so great :).

    This is true - but if I expect it to be 78, or 79, or 80 - I hope that it's at least within a half degree of that - not 1.5 degrees out!
     
  6. madweazl

    madweazl Valuable Member R2R Supporter Build Thread Contributor

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    The difference to the inhabitants in regard to 1.5° would be nothing given your range so I wouldn't worry about it much. I suppose if you were at one extreme or the other in regard to temperature it could become an issue but with most people running 77-83°, it makes no difference to the health of the critters.

    Out of curiosity, did you have multiple [Apex] probes reading the same temp?
     
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  7. TinyChocobo

    TinyChocobo Well-Known Member R2R Supporter Build Thread Contributor

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    I have just the one probe - my old set-up had more than one but this one I only have one on right now.

    And yeah 1.5 isn't a huge difference - but I do prefer things to be as accurate as they can be [within reason].
     
  8. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

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    The temperature correction to pH is mostly important to adjust between the calibration temp and the measurement temp. A probe being off moves them both together so wouldn’t cause a problem.
     
  9. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

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    The error is nowhere near that large. Where did you get that number?
     
  10. TinyChocobo

    TinyChocobo Well-Known Member R2R Supporter Build Thread Contributor

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    I planned on floating my calibration fluid in the sump and re-calibrating anyhow [as I didn't do that the first time].
     
  11. TinyChocobo

    TinyChocobo Well-Known Member R2R Supporter Build Thread Contributor

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    A PH/Temp calculator.
     
  12. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

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    You used it wrong somehow.
     
  13. TinyChocobo

    TinyChocobo Well-Known Member R2R Supporter Build Thread Contributor

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    I put in PH 7.8 and temperature of 78 and got one reading, then I changed temperature to 76.5 and then took the difference between the two outputs.

    It's possible this wasn't a good way to go about it - I'm no expert at this for sure :).
     
  14. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

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  15. TinyChocobo

    TinyChocobo Well-Known Member R2R Supporter Build Thread Contributor

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    I just realized I typed my post wrong. I meant 0.021 not 0.21. Still had the calculator up on my laptop from when I did the math... Sigh :p.
     
  16. madweazl

    madweazl Valuable Member R2R Supporter Build Thread Contributor

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    Cant trick the Dr :)
     
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  17. TinyChocobo

    TinyChocobo Well-Known Member R2R Supporter Build Thread Contributor

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    My PH dropped according to the Apex to 7.79 last night causing it to alert me so that 0.021 did make at least a little difference :).

    Waiting on my PH Fluid to show up.
     
  18. mdbannister

    mdbannister Ahh...the Reef Life Staff Member Team R2R R2R Supporter R2R Excellence Award SCMAS Member Article Contributor Build Thread Contributor Partner Member 2018

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    Interesting. I probably wouldn't be overly concerned about a 1.5* difference. Probably just adjust the tank temp accordingly. That small of a pH reading difference shouldn't impact livestock at all IMHO.
     
  19. TinyChocobo

    TinyChocobo Well-Known Member R2R Supporter Build Thread Contributor

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    Nah the PH reading difference isn't going to affect anything but my Apex alerting me when it drops 0.01 below the threshold :p.

    And yeah 1.5* isn't going to kill anything - but I was a bit surprised to find it that far off.
     
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  20. mdbannister

    mdbannister Ahh...the Reef Life Staff Member Team R2R R2R Supporter R2R Excellence Award SCMAS Member Article Contributor Build Thread Contributor Partner Member 2018

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    It's definitely good to know about the issue...and those pesky alerts would get annoying if you know they're because of a false reading.
     
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