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Help With Refractometer Readings

Aussie Home Brewer

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The Village Idiot

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Hi all,

First problem, the scone burner broke the hydrometer...GGGRRR

On a positive the new refractometer has arrived.

Second problem, how the hell do you adjust a refractometer reading to account for alcohol.(FG)


I have a Brown Ale that shows 1.025 @ 22C and a Swiss Lager that shows 1.019 @12C

Have racked them both.

There are some graphs floating around the site about alc adjust but jeeez they confuse the shit out of me.... too many dead brain cells I suspect.

What to do??


Peter
 

mxd

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as long you know your SG then use this
 

SJW

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Most people tend to use the refractometer for brewing and prior to pitching yeast, then go the hydrometer once fermentation has started. But MXD's link will work, if u know the OG.
Sorry about your hydo. :(
 

Jazzafish

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Broke my last hydrometer years ago!

Some tips I have figured so far(using my refractometer):
When taking a reading, make sure there are no air bubbles or particles in your sample.
Calibrate with distilled water to read zero before reading.
Rinse off calibration water with your sampled wort/beer.
Take a few samples and average them out.
You can get ball park readings at high temps right out of the kettle, but I try to take readings closer to room temp if possible - so cool them.

To calculate SG, I have a free iPhone app called BrewCalc. I also use iBrewmaster and Promash calculators. All of these have a function built in to allow for fermenting/fermented wort. I'm not sure how the formula works?

:icon_offtopic:
Knowing refractometers measure the light refraction through a liquid and reference this to a gravity of the said liquid... Does anyone think the light wavelength would make a difference to the reading? If so, would measuring under artificial light (various light bulbs like fluro,led etc...), change the reading to sunlight? I find the line to be blurry under the shed's fluro by 02 to 0.4 brix and step outside to get a sharper line to read the refraction.

red is edit text
 

The Village Idiot

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Thanks for the replies......

JazzaFish, my uneducated guess would be natural light would be the go.... dont imagine flouro or other internal light would refract the same way as natural.
 

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