Hana Phosphate Meter- opinions?

Discussion in 'Equipment' started by CookieJar, Dec 20, 2010.

  1. ryanjiang

    ryanjiang Guest

    Not sure if it is new model or not, how can I tell?

    For me the regents dissolve OK but it take some time to shake, there is absolutely no way to dissolve regents in the given time window (30 second?), I always use the two tubes and start the test after I have two tubes ready, one with water sample & other with dissolved regents.

    I will prob. bug hanner to get some new regents to check out, what should I say? The regents are hard to dissolve?

    Definitely!

    I take N & P reading as indicator of balance of nutrient import and export, as Rich mentioned what important is trend, not specific numbers.

    I mainly test N as gauge of nutrient & don't test P often, the recent test I wanted to see what is impact from carbon dosing, I kind of expect lower reading since the carbon dosing bring my N from 5 - 10 to less than 1.

    From what I read cyanbacteria is combo of bacteria & algae, they feed on multiple sources, they take P but not as dependent on it like algae.

    So what would be other options to beat it other than manual remove? My cyano problem mainly on sand bed since I have sugar grain can not blow with too much flow.
     
  2. JAR

    JAR Supporting Member


    I was thinking that you would come back with something like...
    "I used 10 different testers all on the same water at the same temperature.
    The batteries in each of the 10 units were verified good. We also tested distilled water. Then I had my buddy (the brain surgeon) do the same thing in case I
    was the issue.
    We again ran all the same tests with 10 different reagent bottles.
    This was all done in a clean room with controlled lighting.
    All of these tests resulted in inconsistent results."
     
  3. Thales

    Thales Past President

    Well, duh. That part was obvious.
     
  4. JAR

    JAR Supporting Member

    OK!
    I got one of these gizmos for Christmas.
    I guess I was not so naughty this year.

    I was able to get consistent readings on the two samples that I tested.
    I ran the same two samples 6 times each through the meter ant the difference was +- 2ppb

    Multiply your reading by 3.066 to convert P to PO4. The HI 736 measures in ppb, so if you want ppm divide by 1000.
    http://reefcentral.com/forums/showthread.php?t=1848082

    Example:
    12 x 3.066 = 36.792 / 1000 = .0367 ppm PO4

    My readings were as follows

    Sample 1
    24
    24
    23
    24
    23
    25

    Sample 2
    27
    25
    25
    25
    26
    25

    average test result ppb P = 24.66666666666666666 x 3.066 = 75.628/1000= 0.075628 ppm P04

    Time to run some GFO and see what happens!
     
  5. Thales

    Thales Past President

    Nice.

    I'll see if I can dig out my meter and try again.
     
  6. xcaret

    xcaret Supporting Member

    Your answer had to be

     
  7. JAR

    JAR Supporting Member

    Not! :D
     
  8. JAR

    JAR Supporting Member

    Not! :D
     
  9. iCon

    iCon Supporting Member

    I wish I had a reefing Santa



     
  10. r0ck0

    r0ck0 Guest

    Shoot, I bought the phosphate HI 713 checker last night. I did not get the ULR phosphorus checker HI 736. I read the thread on reef central saying the ULR is more accurate. Oh well. I tested three times last night and got .07 ppm .00 ppm and .06ppm. So I guess its around .07 +/- 5%

    With such a large error range is this worth testing? There is no way of not having a measurable amount of PO4 so this is only going to give a general range of the level.

    This is for the ULR phosphours checker, its more accurate but still has a large range of error.

     
  11. JAR

    JAR Supporting Member

    24 hours of GFO and my PO4 is down to .0516ppm

    Sweet!

    New problem. I only have 3 packets of reagent left!
     
  12. r0ck0

    r0ck0 Guest

    I must say I am impressed with Hanna's tech support. I have an issue with my checker reporting bad battery, it works about 50% of the time, most often when it starts it reports Bad Bat even with a new battery installed, it even craps out in the middle of a test. I called Hanna and they said they would replace it with a new unit, I asked if it would be possible to get the HI736 ULR phosphorous kit and he said sure no problem, its the same cost and would be better. Very nice support. Though I would have been happy with a working meter this is a nice upgrade. Also the vials leak when shook and he said there are plastic caps that go on before the screw on caps, I did not see these in my kit.

    I think my next purchase will be the Alk meter, with the new liquid regents its supposed to be very accurate and easy to use.
     
  13. Qwiv

    Qwiv Guest

    I have the ALK meter. The implied accuracy is well over what I was expecting. It makes calculating the dose of 2 part in a small tank better. Hoping CA is on the way soon. The liquid reactant is much easier to work with as well.

    I tossed those plastic caps as they get stuck inside the glass for me. Of the 3 meters I have, only one of the 6 cuvettes leaks for me and I use it only for the calibration step only.
     
  14. seminolecpa

    seminolecpa Past President

    If anyone orders more reagents let me know. Mine expired last month still have the older one but my understanding is that it uses the same reagents.
     
  15. JAR

    JAR Supporting Member

    I will need some too.
    I have 3 packets left.
    I plan to use them in the next 3 weeks.
     
  16. Mr. Ugly

    Mr. Ugly Past President

    I picked up one of the Phosphorus meters recently.

    I was surprised at the condition of the cuvettes. Both had horizontal scratches on them ~1/3 of the way down from the top. Deep enough to catch a fingernail. Also had other random scuffs and flaws on the glass.

    That said, I was able to get repeatable results on multiple tests.

    Anybody else get scuffed and/or scratched cuvettes?
     
  17. GreshamH

    GreshamH Guest

    Hmm IIRC they actually came out with new cuvettes Norm. I wonder if yours are the old ones. Then again I could be speaking out my Manus.
     
  18. seminolecpa

    seminolecpa Past President

    Just never gets old.
     
  19. JAR

    JAR Supporting Member

    I was surprised because of two things.
    My cuvettes had minor scratches but also...
    There is a noticeable fingerprint on the inside of the LCD lens.
    I'm still getting repeatable results on multiple tests.
    That being said. I need more reagent.
    I think I'm addicted to it.
    Group buy anyone?
    Rich, did you get your pile of new reagent yet?
     
  20. Mr. Ugly

    Mr. Ugly Past President

    Funny video :D

    Looked on the Hanna websites and didn't see anything about new cuvettes. What's different with the new ones?
     

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