Hydrometer correction for tempature.

TN.Frank · Post by **TN.Frank** » Mon Jan 09, 2006 11:20 am

I have a proof/% Hydrometer that's calibrated for 60deg.F. If I want 80 proof what proof/% should I read at 75deg F.? Thanks.

Post by **Grayson_Stewart** » Mon Jan 09, 2006 3:01 pm

searched google with the terms "Alcohol Temperature Correction Hydrometer" and got this http://members.tripod.com/~BRotter/Calc ... dSugAl.htm" onclick="window.open(this.href);return false;" rel="nofollow

Go figure.

TN.Frank · Post by **TN.Frank** » Mon Jan 09, 2006 3:26 pm

Thanks, I generally hit google but today I'm just being lazy,LOL. For 25C it had a 1.0, does that mean to add 1 proof to what I get or what? They don't make it very clear do they.

knuklehead · Post by **knuklehead** » Mon Jan 09, 2006 9:53 pm

If I am not mistaken that is a corrections chart for wash hydrometer, not a proof hydrometer. Temperature corrections for proof hydrometers is not really as simple as a basic chart where you add or subtract a certain amount for every degree you are out. If you have 40 proof at 70 F it will be out by a certain amount. If you have 180 proof at 70 F it will also be out but by a differant amount then the 40 proof was out. My corrections chart is 10 pages long, lol.

knuklehead · Post by **knuklehead** » Mon Jan 09, 2006 10:06 pm

TNF, my chart is in metic and my hydrometer is calibrated at 20C but I converted your figures and have come up with:
At 75F 80 proof will read 87 proof

TN.Frank · Post by **TN.Frank** » Tue Jan 10, 2006 7:24 am

Thanks Knuklehead. I cut the stuff I rant off somewhere between 85-90 proof yesterday. That should give me a "true" 80 proof or there abouts. Have a good one pard and thanks for the great info.

Guest · Post by **Guest** » Thu Jan 12, 2006 3:02 pm

TN Frank here is a link you can enter your temp and abv readings and it will spit out the corrected strenth.

http://www.distillery-yeast.com/distill ... ometer.htm" onclick="window.open(this.href);return false;" rel="nofollow

I can't vouch for accuracy just yet but the numbers I plugged in seemed reasonable. Hope this helps you.

Transplanted Hillbilly

PS if you can only measure deg.F heres the conversion
deg.C= 5/9 x (deg.F - 32)

TN.Frank · Post by **TN.Frank** » Thu Jan 12, 2006 3:23 pm

Thanks for the link TH.

knuklehead · Post by **knuklehead** » Thu Jan 12, 2006 3:59 pm

The calculator is simplifying it to:

For every degree C over the temperature your alcohol meter is calibrated at subtract 0.3% (0.6 proof) form the reading.
For every degree C below the temperature your alcohol meter is calibrated at add 0.3% (0.6 proof) form the reading

I think that translates to:
For every degree F over the temperature your alcohol meter is calibrated at subtract 0.5% (1 proof) form the reading.
for every degree F under the temperature your alcohol meter is calibrated at add 1.5% (1 proof) form the reading.