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Old 06-05-2004, 10:24 PM   #1
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Refractometer help

I just got a refractometer, but it didn't come with any manual Does anyone know if theres an online manual, or can anyone help me to use it? TIA
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Old 06-05-2004, 10:58 PM   #2
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First calibrate it. You can do this by adding distilled or RO/DI water and making sure it reads 0ppt or 1.000 sg for distilled water.

To use (and calibrate), put a couple of drops of the sample water on the prism, close the lid so the prism is covered with a thin layer of water with no air bubbles (I usually use three drops spaced across the prism). hold the prism up to a light source and look through the eye piece and read. Make sure to set the diopter so the reading is sharp and easy to read
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Old 06-05-2004, 11:16 PM   #3
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So where the blue ends is where its set? Its really hard to see the blue is soooo light. Or do I need to focus it better?
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Old 06-05-2004, 11:24 PM   #4
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It probably needs to be focused better or hold it up to a stronger light, mine is very easy to see. And yes where the blue stops is your reading.
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Old 06-05-2004, 11:27 PM   #5
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I just got one also. Much easier and more percise. I like it. Mine is Exetech.
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Old 06-05-2004, 11:29 PM   #6
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Are you saying point it at the light? I hate to sound stupid but wont the water run off the prism? Thanks for you patience and help
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Old 06-05-2004, 11:45 PM   #7
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When you close the lid, it wont, the water will be sandwiched between the prism and the lid
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Old 06-05-2004, 11:45 PM   #8
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No. Once you put the "flap" down on the sample it won't spill out. You really don't need to look at it very long anyway. Once you get it focused it will be ready for the next time. But the sample won't spill off.

Mike
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Old 06-05-2004, 11:58 PM   #9
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Ok great, I think its already calibrated too.
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Old 06-07-2004, 05:39 PM   #10
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what I’ve found works best for mine (mine is from Milwaukee instruments), is actually standing UNDER a light. I put my sample on and close the lid, then walk into the kitchen where there is a large florescent light in the ceiling. I stand directly under that and look straight ahead and I can see a clear distinction between white and blue.

How do you like it compared to a swing arm?
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