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02-15-2008, 07:45 PM   #11
Soulive
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I'm not familiar with refractometers, can they read OG and FG? Or does the alcohol prohibit them from giving FGs?

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02-15-2008, 07:48 PM   #12
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I found this on BYO:

Quote:
 What is a Refractometer? A Brix refractometer is an optical instrument that measures the sucrose concentration in a sucrose and water solution as a function of the index of refraction of the solution. The kind of Brix refractometer that most brewers use does not contain any electronic components. Refraction is what makes a pencil look bent when it is dipped in a glass of water at an angle. The index of refraction is technically the ratio of the speed of light in a vacuum divided by the speed of light in the sample. It is equal to the sine of the angle of incidence (the angle that the light enters the water) divided by the sine of the angle of refraction (the degree to which the light appears bent) of a beam of light. In equation form it is: RI = sin(I)/sin(r) If you were to stick a pencil in a series of glasses holding increasingly concentrated sugar water, you would see the pencil apparently bent to a greater degree as the sugar content rose. A refractometer makes this measurement very easy and converts the index of refraction to Brix, which is equal to percent sucrose. The refractometer uses the sample to bend light, projecting a line onto a reticule made up of lines and numbers, allowing us to measure of the angle in which the light was bent. A refractometer looks like a little telescope. You lift a window and place a drop of fluid inside, wait 30 seconds to allow the refractometer to become thermally stable (also letting the sample spread across the plate uniformly) then read the result in Brix. Brix can be approximately converted to specific gravity (SG) by a simple equation: SG = 1 +(0.004 x Brix) Most people just remember the multiply by four rule. Take the Brix reading, multiply by 4 and this will give you specific gravity in ãgravity points.ä For example, if you read 11 Brix, multiplying that by 4 yields 44, which corresponds to a specific gravity of 1.044. A slightly more accurate conversion formula is: SG = 1.000019 + [0.003865613(Brix) + 0.00001296425(Brix) + 0.00000005701128(Brix)] Using this formula, a Brix reading of 11 yields a specific gravity of 1.043.
I don't have one and don't know for sure, but I would imagine that it could be used for measuring both.

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02-15-2008, 07:56 PM   #13
Bobby_M
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There are tricks for compensating for alcohol content for FG measurement but a lot of people have stated that it's innacurate when double checking with a simple hydrometer.

I know that fly spargers like em so they can occassionally grab a quick sample during the sparge to see how much more sparging they should do.

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02-15-2008, 07:57 PM   #14
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Quote:
 Originally Posted by Soulive I'm not familiar with refractometers, can they read OG and FG? Or does the alcohol prohibit them from giving FGs?
The alcohol in finished beer messes up refractometer readings. There are correction formulas but I think they are considered inaccurate. Not sure why. This is why I'm also going to get a finishing gravity hydro.

Refractometers are most useful for measuring sparge runnings, and pre- and post-boil gravity.
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02-15-2008, 09:56 PM   #15
Austinhomebrew
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Quote:
 Originally Posted by Evan! What about the drip plate, man..put THAT on sale!!! I need one!!!
Done
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02-15-2008, 10:52 PM   #16
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Quote:
 Originally Posted by Austinhomebrew Done
Oh boy, now you've done it
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02-15-2008, 11:01 PM   #17
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Haha.. wow! Are you taking requests Forest?

Ventmatics cough cough Ventmatics

Not that i am looking a gift horse in the mouth, whatever that means...

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02-15-2008, 11:48 PM   #18
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Gah! You're killing me. I just ordered \$100 worth of ingredients and equipment last week. Now you have refracts *and* drip plates on sale....must resist...

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02-16-2008, 02:10 AM   #19
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Quote:
 Originally Posted by aekdbbop Haha.. wow! Are you taking requests Forest? Ventmatics cough cough Ventmatics Not that i am looking a gift horse in the mouth, whatever that means...

I am taking suggestions but the Ventmatics are no longer made so I can't really put them on sale. I am sure you understand. If you want to buy some Ventmatics you had better do it soon.

Forrest
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02-16-2008, 02:16 AM   #20
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Quote:
 Originally Posted by Austinhomebrew I am taking suggestions but the Ventmatics are no longer made so I can't really put them on sale. I am sure you understand. If you want to buy some Ventmatics you had better do it soon. Forrest
Oh, you've GOT to be kidding. I just got a couple from you. I eventually want six of them but I can't afford them all at once. Are you telling me I have to have mismatched faucets on my bar? What about parts for them?

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