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Old 05/05/2015, 02:12 PM   #1
RGA
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Refractometer or Electronic Calibration from RODI ??

Hello, I am new to the hobby and starting a saltwater tank.

I have noticed that when mixing my saltwater, my new electronic tester with auto temp correction gives a reading of 2.9% at 20 degrees, but my refractometer is showing 1.030 !

I have checked the refractometer against my RODI water and it is testing at zero.

Am I reading the electronic one incorrectly, or not set it ?

Its a Tecpel 850

Do I need to go to the expense of some calibration fluid, you would think RODI water should be ok ?

Any help, much appreciated, as if I don't start off with the right salinity from day 1 , I am sure to fail !



Last edited by RGA; 05/05/2015 at 02:28 PM.
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Old 05/05/2015, 04:32 PM   #2
JammyBirch
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Quote:
Originally Posted by RGA View Post
Hello, I am new to the hobby and starting a saltwater tank.

I have noticed that when mixing my saltwater, my new electronic tester with auto temp correction gives a reading of 2.9% at 20 degrees, but my refractometer is showing 1.030 !

I have checked the refractometer against my RODI water and it is testing at zero.

Am I reading the electronic one incorrectly, or not set it ?

Its a Tecpel 850

Do I need to go to the expense of some calibration fluid, you would think RODI water should be ok ?

Any help, much appreciated, as if I don't start off with the right salinity from day 1 , I am sure to fail !
Rodi is not a good calibration for a refractometer. The calibration fluid is $3, if that's expensive sell the tank...this is not the hobby for you.

What are the units on the electronic meter? Sounds like something is way off, 1.030 should be 40%, 2.9% isn't even close.

Get the calibration fluid it will never give you false data.


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Old 05/05/2015, 04:41 PM   #3
gone fishin
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I do not have any experience with the Tecpel but, one should calibrate a refractometer with calibration fluid periodically. Good luck just my 2 cents worth.


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Old 05/05/2015, 07:19 PM   #4
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Quote:
Originally Posted by JammyBirch View Post
What are the units on the electronic meter? Sounds like something is way off, 1.030 should be 40%, 2.9% isn't even close.
I'm confused by this answer, how do you arrive at 40% for 1.030?
2.9% is so close to .030 that it is within error margins of our hobby grade equipment.
Please explain.


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Old 05/05/2015, 09:18 PM   #5
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I'm confused by this answer, how do you arrive at 40% for 1.030?
2.9% is so close to .030 that it is within error margins of our hobby grade equipment.
Please explain.
I believe he meant 40ppt, which is 4.0%.


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Old 05/06/2015, 06:41 AM   #6
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Makes sense now.
Thanks for clarifying.


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Old 05/06/2015, 08:41 AM   #7
JammyBirch
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i looked at my refractometer 4% is 1.030 on the gauge i believe. The gauge i have has SG on one side and brix percent on the other. Must have missed the decimal. I need to check this again now since i never use the % scale...sorry for any confusion.


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Old 05/06/2015, 03:16 PM   #8
RGA
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Thanks for the reply everyone.

Yes, calibration fluid is the way forward, as the readings are way off on both, unless the salinity meter is reading 2.9% meaning 1.029. Unfortunately, not clear in manual, making me assume 29 ppt, and that makes more sense.

Thought the RODI would be sufficient, but having read more on this subject, I can see that is not always the case.


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Old 05/06/2015, 04:04 PM   #9
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I originally used RO/DI to calibrate(the instructions even say to use RO/DI). When I finally got some calibration fluid, it was off by .002 to .004. I only use calibration fluid now.


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Old 05/06/2015, 07:27 PM   #10
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JammyBirch, Thanks for clearing that up. My mistake as well confusing 1.030 SG as 2.9%.
Too many names for the same salinity level.
Just one more way to confuse newcomers ( and some mot so new )


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