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Old 04-13-2008, 07:15 AM   #1
TimBrewz
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Default O.G. taken after yeast pitched...hydrometer reading off?

So, its a late brew night, I checked my gravity as I went through the boil and it was pretty close to my expectations. Then I chilled the wort and forgot to take the O.G. before I pitched my yeast. I just took a reading ( 10 min. after pitching yeast) and it seems to be reading lower (1.062) than my expected OG.of 1.070 The wort is at 68f, so no correction needed...is this right or did I just miss my target?Seems that the yeast couldn't convert enough sugars to alcohol in 10 minutes to pull my gravity down that much.


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Old 04-13-2008, 07:45 AM   #2
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No, the yeast isn't going to affect the OG at all. What you got is what you got. Did you pitch a large starter into the wort? That can affect the OG readings a little. If it was just a vial or a yeast packet then that's your actual OG.


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Old 04-13-2008, 02:13 PM   #3
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Thanks EvilTOJ-you confirmed by hunch-missed my mark. I pitched a 1 liter starter. Oh well-I now have to figure out that part. I guess my pre-boil gravity was not accurate. I corrected it from 130 f and that may not give an accurate reading.
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Old 04-13-2008, 03:05 PM   #4
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My readings are not that reliable at high temps. I took a reading at 122f yesterday 1.030, temp corrected, by the time it had cooled to 70f the reading was 1.036. I always take OG after I pitch - then I monitor progress during primary. It is usually a good indicator of what is going on, but not exactly.
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Old 04-13-2008, 08:59 PM   #5
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If it makes you feel any better, unless you're hydrometer is calibrated to 70dF, you could add a point ... assuming you're hydrometer is calibrated to 60dF.
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Old 04-15-2008, 04:14 AM   #6
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It is very highly unlikely your yeast converted anything in 10 minutes you are fine.


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