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Old 06/17/2017, 08:37 PM   #1
garrettm
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Calibration Issues: Milwaukee Refractometer

Anyone else experience this before when calibrating a Milwaukee Refractometer?

I went to test my salinity tonight with the Milwaukee Refractometer and my initial test came out with a S.G. of 1.004. Something was wrong. Tested another sample 1.004 again. Ok, time to calibrate.

I go to calibrate with RO/DI water and get the "LO" error message. I look up the manual and it says this message means the "Wrong calibration used to
deionized or distilled water." hmm... is my RO/DI water bad, doubt it.

Now I pull out the standard calibration liquid "Steam Distilled Water for Calibration Use Only" 1.000 S.G. reading for calibration is still "LO"

https://images-na.ssl-images-amazon....1CYQsDiz7L.pdf

I will call Milwaukee during the week but of course this happens right when I need to verify salinity of a qt tank.


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Old 06/18/2017, 07:33 AM   #2
bertoni
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Have you checked the TDS of the RO/DI? It seems hard to believe that the filtration could be so bad that it causes this problem, but maybe something got into the sample?


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Old 06/18/2017, 08:11 AM   #3
garrettm
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Yikes! TDS is 15 for the RO/DI sitting in the drum. Right out of the unit it says 0 but in the drum it's 15. Something else to address.

I'll see if I can get a truly 0 TDS sample to test.

Thanks!


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Old 06/18/2017, 10:36 AM   #4
GimpyFin
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I started having an issue with my Milwaukee after almost 4 years. I started noticing freshly mixed SW was reading unusually low (Same volume/type/amount of salt and water as usual.) I went to re-calibrate both with my 0 TDS ro/di and with distilled and I got all kinds of readings. I'd calibrate, then do an immediate test with the same ro/di or distilled and it would read about 3-4 points higher or I'd get the "LO" reading instead of 1.000. I fussed with it about 20+ different times and finally just ended up ordering a new one and it's been fine (Both distilled and ro/di as well as the reference solution read accurately now.) I even used the 1.025 reference solution that came with the new one on the old unit and it gave me sporadic readings. Might not be the case with yours, but just a possibility.


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Old 06/18/2017, 11:57 AM   #5
garrettm
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I was hoping that wasn't the case but it may be. The unit is 3.5 years old? Maybe I dropped it one too many times or some liquid has leaked into the internals. Any case I'll probably buy a new one after talking with Milwaukee if I can get a hold of them. I do love this tester.


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Old 06/19/2017, 12:47 PM   #6
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Yeah, I really like it as well. The original one I bought was the version without the nice protective case and I figured banged it or did something to mess it up.


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