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 Home Brew Forums > Help with hitting Target O.G.

02-19-2014, 03:48 AM   #21
green_lantern11
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I was just hoping you would catch something I didn't. I'm gonna try the formula that ALLEY suggested. Thanks for all the help. I appreciate it.

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02-21-2014, 01:56 PM   #22
del
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You say your pre-boil measurement is adjusted for temperature. Does this mean you cool off the wort before measuring, or does it mean you measure hot wort, check its temperature, and use a correction for this?

I find that if I measure hot wort and calculate the "correct" SG using Beersmith or similar tools, the number I get is higher than when the wort has cooled off. In other words, if I measure hot pre-boil wort, I will overestimate my pre-boil SG. Could this be your issue?

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02-25-2014, 12:12 AM   #23
green_lantern11
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Both actually. I've taken readings and adjusted for temp and I've waited until it gets down to the calibrated temp of 60F. Same number.

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02-25-2014, 03:25 PM   #24
LovesIPA
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Quote:
 Originally Posted by del I find that if I measure hot wort and calculate the "correct" SG using Beersmith or similar tools, the number I get is higher than when the wort has cooled off. In other words, if I measure hot pre-boil wort, I will overestimate my pre-boil SG. Could this be your issue?
I find that the temp-corrected gravities of a sample at 150 degrees vs. the same sample at 60 degrees are within a point or two of each other. Well within the margin of error in reading a hydrometer.
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02-25-2014, 08:10 PM   #25
del
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Yeah, you know... they really should be. The properties of hot liquids are actually quite well known, so it really bothers me that I've had this issue. I really don't know what could be causing it. I think I'll do a session where I heat water to different temps with it and check the calibration.

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