refractometer flaw?

[ianmowat]

have read that refractometers give false reading in the presence of alcohol !!! have found this to be true...why ????

 

[browndog]

Because they measure the sugar content of the sample, not alcohol.

 

[bignath]

I am not completely sure, but if i had to suppose a guess, id say because the alcohol probably alters how the light is refracted (or bent) in the prism, therefore giving an innacurate reading.

Do a search for refractometer calibration chart or something like that, you'll find several charts that have been drawn up to take into account the presence of alcohol when reading a refractometer.

 

[doon]

Just use a program or app to correct it. Simple

 

[tonyt]

http://www.musther.net/vinocalc.html#monitorferment

Try this

 

[MaltyHops]

I've charts linked from my sig...

 

[thedragon]

I've charts linked from my sig...

Great tool, thanks!

 

[Online Brewing Supplies]

Throw it in the bin and get a hydrometer. :lol:
F-ing loath the things..
Nev