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Author Topic: SG issue  (Read 242 times)

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Offline AvAnAle

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SG issue
« on: November 30, 2017, 05:11:09 PM »
Gday guys,

Bearing in mind I'm still pretty fresh to brewing, I had an issue today with a blonde I haven't run into before. I measured the pre boil SG at 1.046 which is a little higher than anticipated but ok. When I did the post boil my SG was 1.030!

I used a digital thermometer and the brewers friend website to correct for the temperature so I have no idea what's happening. I'm using beersmith for my brewing mostly. Only thing I can think of is if the bit of trub/shit that pulled through in my post boil sample effected the reading somehow?

Any ideas?

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Offline cronessa

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Re: SG issue
« Reply #1 on: November 30, 2017, 06:27:54 PM »
How hot was the wort when you took the readings?

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Offline AvAnAle

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Re: SG issue
« Reply #2 on: November 30, 2017, 07:14:06 PM »
How hot was the wort when you took the readings?

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Pre boil was 35 degrees and the post 41. Temp corrected though

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Offline bookworm1707

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Re: SG issue
« Reply #3 on: November 30, 2017, 08:24:14 PM »
If it's in the fermenter take a sample now.

If not take one when you put it in.

My assumption is that it is a temp correction error. it can be tricky. I often put hot samples in the fridge/freezer to get them close to the 20c and check then.

Doesn't sound like it's an issue for this one but also good to test it with some plain water now and then.

Offline bookworm1707

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Re: SG issue
« Reply #4 on: November 30, 2017, 08:24:51 PM »
And if you had 1046 the beer should be fine.

Offline FishersFirst

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Re: SG issue
« Reply #5 on: November 30, 2017, 09:08:42 PM »
I assume you're using a hydrometer?


Offline AvAnAle

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Re: SG issue
« Reply #6 on: November 30, 2017, 10:06:41 PM »
Normally I would have taken the time to chuck it in the freezer or something similar but I was trying to squeeze in two brews today as well as couple loads of washing, dishes and all those fun things.

The tap water today was quite warm ~35  so I couldn't get my wort chiller to bring the temp down enough, still above 30 in the fermenter at the moment. I'll check it tomorrow and reassess.

And yeah hydrometer

Thanks guys

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Offline NigeP62

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Re: SG issue
« Reply #7 on: November 30, 2017, 11:14:14 PM »
Obviously not possible to have a post boil gravity higher than the pre boil.
What was your calculated pre boil gravity? I'd say it is a reading error post boil. Temp correction miscalculation?

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Offline NigeP62

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Re: SG issue
« Reply #8 on: November 30, 2017, 11:17:55 PM »
How hot was the wort when you took the readings?

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Pre boil was 35 degrees and the post 41. Temp corrected though

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Did you say you didn't cool the samples? How did you get the pre boil down to 35? Or could that be an error?

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Offline Leprechaun

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Re: SG issue
« Reply #9 on: December 01, 2017, 12:00:21 AM »
Try to keep your fermentation under 20° for 3 days at least . US05 is a beast at high temperatures. Kept down, always been good me

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Offline Leprechaun

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Re: SG issue
« Reply #10 on: December 01, 2017, 12:21:59 AM »
That will get you beer. It's a bizarre prickadement you present

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Offline AvAnAle

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Re: SG issue
« Reply #11 on: December 01, 2017, 07:03:03 AM »
How hot was the wort when you took the readings?

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Pre boil was 35 degrees and the post 41. Temp corrected though

Sent from my SM-G930F using Tapatalk
Did you say you didn't cool the samples? How did you get the pre boil down to 35? Or could that be an error?

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I did cool the samples but only down to those temps mentioned. I pretty much had the sample in the hydrometer cylinder and ran tap water over it with a digital thermometer in the sample.

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Offline AvAnAle

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Re: SG issue
« Reply #12 on: December 01, 2017, 07:04:30 AM »
Obviously not possible to have a post boil gravity higher than the pre boil.
What was your calculated pre boil gravity? I'd say it is a reading error post boil. Temp correction miscalculation?

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I really don't think I misread anything, I checked it a few times to make sure I wasn't seeing things!

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Offline AvAnAle

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Re: SG issue
« Reply #13 on: December 01, 2017, 07:05:27 AM »
Try to keep your fermentation under 20° for 3 days at least . US05 is a beast at high temperatures. Kept down, always been good me

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Yeah I generally try to keep US05 at around 18, mind you I don't have great temperature control.

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Offline bookworm1707

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Re: SG issue
« Reply #14 on: December 01, 2017, 07:44:58 AM »
Can you take a sample today?

Offline AvAnAle

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Re: SG issue
« Reply #15 on: December 02, 2017, 09:39:45 AM »
I think the beer was never meant to be, I checked on it yesterday before pitching and it had a thin foam layer on top the same as it would when active yeast is there. Frustrating as I have made a point of it to always stick to my hygiene routine. I pitched some notty over the top of it just to see what happens as I haven't had an infected beer before. As of today it still smells nice enough and appears to be fermenting as well as normal. Curious to see how it all pans out.

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Offline Scrivenovski

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Re: SG issue
« Reply #16 on: December 04, 2017, 12:02:54 PM »
I used to have a similar but slightly different problem with pre-boil SG. I used to get really low pre-boil SG, predicting shithouse efficiency, only to find my SG into the fermentor right on the money. After much head scratching I worked out I was taking my pre-boil sample out of the kettle pickup tube, the same line I had just pumped the sparged wort into. What I was actually measuring was the final runnings from the sparge that were left in the pickup tube. I now run off a bit before measuring pre boil gravity and the numbers are where they should be. It sounds like this isn't your problem, as your numbers are the other way around, but it shows how measurement method can make a big difference. Try taking samples from another sample point if possible. If you have significant trub or cold break in your sample it can mess with the density too.