Refractometer Correction Spreadsheet

Nosybear said:
I didn't set it up that way - but you can modify it to take out the Brix conversion in column E and enter the data directly there. You'll have to know your refractometer's wort conversion factor - measure a few worts with both a refractometer and a hydrometer before pitching, the ratio is the correction factor.
Click to expand...
I've just done that :p I just got my refractometer last weekend and the first measurement was pretty close, if not almost the same as the hydrometer. Based on the equation you've used, would be possible to convert to % conversion right?
I just brewed 2 days ago, so I miss the second point, but I will follow your table.
I got today a Brix reading of 9°. adding directly to your equation gave me a value of 6°. My FG is 3.
Thanks again for your table, want to go throught the math later on :p
Cheers
 
Gledison said:
I've just done that :p I just got my refractometer last weekend and the first measurement was pretty close, if not almost the same as the hydrometer. Based on the equation you've used, would be possible to convert to % conversion right?
I just brewed 2 days ago, so I miss the second point, but I will follow your table.
I got today a Brix reading of 9°. adding directly to your equation gave me a value of 6°. My FG is 3.
Thanks again for your table, want to go throught the math later on :p
Cheers
Click to expand...
New reading today and it was 5,2°P. This gave me a corrected value of 0,3°P (1,001 sg).
Is there something wrong? my FG should be around 3. following this correction Im almost with pure water :p
any tip?
 
6.3 degrees Plato equates to 1.008 - so I'm guessing the 1.001 is somewhere near right. Cross-check with the hydrometer and let me know if it's off....
 
Nosybear said:
6.3 degrees Plato equates to 1.008 - so I'm guessing the 1.001 is somewhere near right. Cross-check with the hydrometer and let me know if it's off....
Click to expand...
As im running a 5L batch(1.32 US Gallons) im not taking hydrometer samples all the time ( I know I should to get the correlation). by the end I will measure the final gravity and let you know. yesterday, I tasted the little sample I've got and it seems done :)
What im not getting is : if the corrected value gives me ca. 0.3 Plato FG This would be a way off my calculated ABV (5.6%), reaching ca 7%. Normally my final gravities are in the range of 3 Plato (which was expected to reach the 5.6%) .
I believe the FG is very dependent on the mash temperature right? if I have a high amount of unfermentable sugers, they would increase the FG.
Have you ever got sg readings of FG very close to 1.000? (hydrometer)?
 
Gledison said:
As im running a 5L batch(1.32 US Gallons) im not taking hydrometer samples all the time ( I know I should to get the correlation). by the end I will measure the final gravity and let you know. yesterday, I tasted the little sample I've got and it seems done :)
What im not getting is : if the corrected value gives me ca. 0.3 Plato FG This would be a way off my calculated ABV (5.6%), reaching ca 7%. Normally my final gravities are in the range of 3 Plato (which was expected to reach the 5.6%) .
I believe the FG is very dependent on the mash temperature right? if I have a high amount of unfermentable sugers, they would increase the FG.
Have you ever got sg readings of FG very close to 1.000? (hydrometer)?
Click to expand...
No but I'm not brewing your beer. Take a hydrometer reading as a cross check, then next batch take the OG using both instruments. The ratio of the two should be your wort correction factor.
 
Nosybear said:
6.3 degrees Plato equates to 1.008 - so I'm guessing the 1.001 is somewhere near right. Cross-check with the hydrometer and let me know if it's off....
Click to expand...
Hey Nosybear,
just took the last readings today. Hydrometer 3°P, Refractometer WRI (non corrected) 6.8°P. corrected is 2.7.
what do you think? close enough? my previous reading were too low somehow. with both this values it makes sense and it fits with the expected attenuation and not a crazy 91% that previous reading was suggesting.
 
Gledison said:
Hey Nosybear,
just took the last readings today. Hydrometer 3°P, Refractometer WRI (non corrected) 6.8°P. corrected is 2.7.
what do you think? close enough? my previous reading were too low somehow. with both this values it makes sense and it fits with the expected attenuation and not a crazy 91% that previous reading was suggesting.
Click to expand...
A little farther off than I get but then your wort correction factor for your refractometer might be a bit different. Given the difficulty of reading a hydrometer accurately, I'd call an error of 0.3° P spot on. And it's a sample size of a drop rather than the hydrometer sample glass volume.
 
Nosybear said:
A little farther off than I get but then your wort correction factor for your refractometer might be a bit different. Given the difficulty of reading a hydrometer accurately, I'd call an error of 0.3° P spot on. And it's a sample size of a drop rather than the hydrometer sample glass volume.
Click to expand...
Definitely! As I brew small batches, this is very important.
thanks
 
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