Author Topic: Secondary ferment SG increases any ideas?  (Read 693 times)

Offline Tim

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Secondary ferment SG increases any ideas?
« on: September 15, 2018, 01:03:17 PM »
I secondary most of my beers just for that clarity.  I usually wait until the SG in the primary has pretty much bottomed out then rack to secondary for a few days.  This generally produces some real clear beers and very tasty.  However, the last two that I racked to secondary the SG went up .002 and didn't work back down.  I thought it was because I moved the primary and may have shook it just a bit.  So, the next one I racked without moving the primary and the SG went up again.  Any thoughts?
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Offline Robert

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Re: Secondary ferment SG increases any ideas?
« Reply #1 on: September 15, 2018, 01:12:05 PM »
I usually see the same thing after crashing.  I just assume that in the really clear beer I'm getting a more accurate reading, though I haven't thought through the mechanics of what might be going on.  At least you know it's not still going down, and the difference is really barely significant.
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Offline goose

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Re: Secondary ferment SG increases any ideas?
« Reply #2 on: September 15, 2018, 01:29:54 PM »
Another thought is that you might have some CO2  bubbles coming out of solution after racking that are sticking to the side of the hydrometer and causing it to read higher.  I always give mine a twirl in the test jar to dislodge them and then let it sit for several minutes to stabilize.  FYI, I read my gravities in degrees Plato and find that the extra time allows the hydrometer and the internal compensation thermometer to settle in to get a more accurate reading.  Learned that and switched from SG to degrees Plato when I was doing my pro-brewer gig.
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Offline dmtaylor

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Re: Secondary ferment SG increases any ideas?
« Reply #3 on: September 15, 2018, 01:32:33 PM »
Temperature has a significant impact on gravity readings.  Also, it's not always easy to read a hydro.  The error rate in reading one is about + or - 0.002.  So if you're still within that 0.002, it's not even a significant error.
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Offline BrewBama

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Re: Secondary ferment SG increases any ideas?
« Reply #4 on: September 15, 2018, 02:31:26 PM »
Temperature has a significant impact on gravity readings.  Also, it's not always easy to read a hydro.  The error rate in reading one is about + or - 0.002.  So if you're still within that 0.002, it's not even a significant error.

+1. I was thinking as I read this that .002 is well within tolerance in my brewhaus. Interesting phenomenon though.


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Offline denny

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Re: Secondary ferment SG increases any ideas?
« Reply #5 on: September 15, 2018, 04:15:43 PM »
Temperature has a significant impact on gravity readings.  Also, it's not always easy to read a hydro.  The error rate in reading one is about + or - 0.002.  So if you're still within that 0.002, it's not even a significant error.

+1. I was thinking as I read this that .002 is well within tolerance in my brewhaus. Interesting phenomenon though.


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Offline Tim

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Re: Secondary ferment SG increases any ideas?
« Reply #6 on: September 15, 2018, 09:54:33 PM »
Thanks folks.  Seems all is well.  I've been using the Tilt hydrometer to monitor the progress, but always double check with a hydrometer before racking.  I did find out the hard way how temp affects the reading; all mistakes are learning experiences.

Thanks again for the info.
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