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Old 11/07/2008, 09:51 AM   #1
kveille
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How to calibrate a refractometer using calibration fluid?

I bought a refractometer from Dr. Fosters and I also bought the Pinpoint 53.0 µS Calibration/Reference Fluid. The directions that came with the refractomeeter said that you can use either distilled water or calibration fluid. I decided to use distilled water because I was not sure how to calibrate it using the calibration fluid. I read in a few places that it is better to use the calibration fluid rather than distilled water.

The calibration fluid did not come with any directions, so what level should I be looking for when calibrating with it? Thanks.


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Old 11/07/2008, 09:54 AM   #2
halcyon_diver
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35ppt


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Old 11/07/2008, 09:55 AM   #3
michellejy
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There was an article on here about that, so feel free to double check this:

It should be 1.026 SG / 35 ppt


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Old 11/07/2008, 09:58 AM   #4
kveille
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So I should put the calibration fluid on my refractometer and use the screw driver (if necessary) to tweak it until it reads 35 ppt/1.025?

How often should you have to check the calibration?


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Old 11/07/2008, 10:02 AM   #5
michellejy
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35 ppt/ 1.026 not 1.025

I check the calibration every time I make a new batch of water, but maybe I'm overly cautious.


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Old 11/07/2008, 10:06 AM   #6
halcyon_diver
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So I should put the calibration fluid on my refractometer and use the screw driver (if necessary) to tweak it until it reads 35 ppt/1.025?..................yes...make sure the water is @ 78 degrees,your readings will change with temp fluctuations, i do 4 water changes a month and check the calibration monthly


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Old 11/07/2008, 10:42 AM   #7
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Oh, that's a good point. Did you get a refractometer with ATC?


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Old 11/07/2008, 11:03 AM   #8
kveille
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Quote:
Originally posted by michellejy
Oh, that's a good point. Did you get a refractometer with ATC?
Yes it has Automatic Temperature Correction.


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Old 11/07/2008, 11:43 AM   #9
coryjac0b
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i was told i can calibrate my refractometer with RO/DI water.

is that true?


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