Hanna Marine Magnesium Checker HI783 Problems/Issues

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Are you experiencing issues with your Marine Magnesium Checker (HI783)?

  • Yes - Describe Below

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  • No

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Brewtoszek

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I think this causes more harm than good. Its hard to get a good seal on these. Im going to try to run a test without the tips.
The tips I got in this kit were also bad, they are suppose to fit tightly on the syringes. The first test I ran the tip fell off while I was aspirating the reagent, that was fun to fish out. I used a spare tip I had from another Hanna checker reagent kit and it was fine. All 3 from the Magnesium kit were too loose.
 

Coolcasino

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I pushed the little piece of airline tubing that holds the syringe in the tip down a bit more. This does help to make it tighter. This unfortunately does not make the checker anymore accurate and I still was getting high results. I just think the tips are useless themselves since we don't have to do any type of titration here.
 

Brewtoszek

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I pushed the little piece of airline tubing that holds the syringe in the tip down a bit more. This does help to make it tighter. This unfortunately does not make the checker anymore accurate and I still was getting high results. I just think the tips are useless themselves since we don't have to do any type of titration here.
I think the purpose of the tips is just so you don’t dip the syringe into the reagent when your aspirating, would reduce likelihood of contact with your hand when dispensing into the cuvette, I could be wrong though.
 

Coolcasino

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I think the purpose of the tips is just so you don’t dip the syringe into the reagent when your aspirating, would reduce likelihood of contact with your hand when dispensing into the cuvette, I could be wrong though.
Yeah it does make sense. I still think it's better to just not use the tips. Just be extra careful I guess. I'm going to try this when I get home and see if it helps but I don't know if it will help that much.
 

RobertAshby

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I think this causes more harm than good. Its hard to get a good seal on these. Im going to try to run a test without the tips.
I just did two tests without the tips and got results of 1675 and 1690 which is better than the 1800+ I have been consistently getting when using the tips, but still ~300 higher than the actual levels. I guess when I use the tips they suck in some air even if I go slowly.
 

Coolcasino

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I just did two tests without the tips and got results of 1675 and 1690 which is better than the 1800+ I have been consistently getting when using the tips, but still ~300 higher than the actual levels. I guess when I use the tips they suck in some air even if I go slowly.
Thats what I was afraid of. Thanks for saving me the trouble.
 

paparoof

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I too got a crazy high reading (1550+) on my first attempt with the new Mag checker. Came here, did some reading, went back and made sure the syringe tips were tight, made sure there were no drops on the outside of the tips, made sure I wasn't leaving drops in the tip, tried to be as precise about it as possible.

Two more tests with the Hanna gave 1440 and 1425 - seems close enough to call "consistent".

Problem is, Salifert sez 1350 (which it has said consistently for months now) and ATI ICP says 1283. So who to believe?
 

sublime275

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I too got a crazy high reading (1550+) on my first attempt with the new Mag checker. Came here, did some reading, went back and made sure the syringe tips were tight, made sure there were no drops on the outside of the tips, made sure I wasn't leaving drops in the tip, tried to be as precise about it as possible.

Two more tests with the Hanna gave 1440 and 1425 - seems close enough to call "consistent".

Problem is, Salifert sez 1350 (which it has said consistently for months now) and ATI ICP says 1283. So who to believe?
It would be best to test it using a reference solution like the ones that Fauna Marin or ATI make. I’ve tested mine using the Fauna Marin solution and it gave readings that were 150-250ppm higher that what was on the label.
 

SaltwaterAq

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Do me a favor and redo a test. When Reagent A draws air, you get less of Reagent A in the test pushing the numbers high. Try running a test using the tip but using 5 ml of Reagent A. This will allow for error when drawing up Reagent A. Please let me know how this works for you. I think they created the instructions of 4 ml of A based on lab grade equipment, not regular guys doing the test at home, with plastic tips that suck in air and with all the errors we create. Try 5 ml of Reagent A and let me know how it goes for you.
 
OP
trevorhiller

trevorhiller

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Do me a favor and redo a test. When Reagent A draws air, you get less of Reagent A in the test pushing the numbers high. Try running a test using the tip but using 5 ml of Reagent A. This will allow for error when drawing up Reagent A. Please let me know how this works for you. I think they created the instructions of 4 ml of A based on lab grade equipment, not regular guys doing the test at home, with plastic tips that suck in air and with all the errors we create. Try 5 ml of Reagent A and let me know how it goes for you.
I sent mine back already or I would try this, but I don’t think it’ll solve the issue—atleast with the specified volumes. After getting 2 rather high readings, the first thing I did to troubleshoot was remove the tips and use the syringes only to make sure there were no air bubbles and the volumes were precise.

I also tried it with a laboratory style volumetric pipettor for the sample and reagent A & B—same high readings.

Perhaps someone else wants to experiment with different volumes of reagent A and see if they get more accurate results. It does seem plausible that if everyone is getting results about 200-300 higher that adjusting the reagent volumes may be able to correct the issue.
 

SaltwaterAq

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Mine tests are spot on with 5 ML of Reagent A. 1660 with 4 ML.

Photo Jun 10, 10 19 58 AM.jpg
Photo Jun 10, 10 20 16 AM.png
 

SaltwaterAq

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4 ML I see high readings compared to my trident, etc. Hopefully the fix is that easy. You just need to make sure you get the right amount of Reagent A for an accurate test. There could be an issue with the tips sucking air, or the size/design of the syringe IMO.

Photo Jun 10, 10 28 55 AM.jpg
 

exnisstech

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Kind is off topic but are the tips the big plastic things that have also been shipping with the alk reagents lately (lately as in the last year or so)? When I opened a box of alk reagent and saw the tip I was like what the heck is this thing and I didn't trust it ? I've never used one and keep using the old style shown. Could be a solution if it is the tips causing the inaccuracy?

16549535147187433718604841501251.jpg
 

Coolcasino

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Mine tests are spot on with 5 ML of Reagent A. 1660 with 4 ML.
I got 1300. All other tests kits come up about 50 more which this is an improvement over the 300 over that I was getting. But I don't think this is the solution. I tried using 5ml of 1 and then 5ml of tank water and 1 ml of 2 and got high results. Tried with tips off and got wacky results. Tried all combos of tips on and off and less ml or more ml and got varying results. We cant trust these results if the tools that are provided with this kit are not working as intended and we have to play around with measurement of reagents and water to get the result we want to see. I can to that with salifert... if I add less of reagent 2 (powder) I can rig the result. I was thinking of just hot gluing the tips onto the syringes but I have ran out of reagent 2. I now have a very expensive paper weight and a cool project box to build something with. I also have 2 new cuvettes that the 10ml marking and lettering has been erased. I dont see this getting fixed in the near future as Hanna has not responded to any of the threads. They are very responsive when you call. But there's a wait to get a replacement. In the meantime they have not pulled the checkers from stores. Just sell them and we will exchange them later is there motto now.
 

Coolcasino

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Could be a solution if it is the tips causing the inaccuracy?
I definitely think there's something wrong with these syringes and tips. They are cheap and who knows if the markings are accurate. They have started to rub off. I cant see the lines clearly anymore. The only 1 that is still clear is the 5ml blue 1.
 

mwilk19

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I just watched a YouTube video from Parker's Reef where he tests the Hanna Ammonia and Magnesium checkers. The Magnesium checker was true to form coming in at 300-400 higher than other tests. He even performed the tests with the tips off and still got high readings. There's obviously a problem with these checkers. Hopefully Hanna comes up with a solution soon.
 

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