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Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > Adjusting Hydrometer readings for temp.
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Old 07-25-2008, 03:09 PM   #1
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Default Adjusting Hydrometer readings for temp.

During all grain brewing, do you take the pre-boil hydrometer reading immediately after the sparge when the water is still 180 degrees? How do you adjust for that high temperature to get anything near an accurate reading.

I'm sure this is a bit of a dumb question, it just left me confused.

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Old 07-25-2008, 03:11 PM   #2
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Chill the sample down 1st

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Old 07-25-2008, 03:12 PM   #3
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I use a refractometer for my preboil gravities, since it automatically adjusts for temperatures.

You can cool down a wort sample by putting ice around the sample container. Or you can take the gravity reading, take the wort temperature, then adjust the gravity reading to the temperature.

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Old 07-25-2008, 03:26 PM   #4
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yep cool the sample down

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Old 07-25-2008, 03:31 PM   #5
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Quote:
Originally Posted by Bytor1100 View Post
take the wort temperature, then adjust the gravity reading to the temperature.

Not a good practice to place a room temp thin glass hydro in 170º + liquid but yes you "can" do it.


Throw the sample in the freezer for about 10 min then adjust for temp when it gets 90º or lower.
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Old 07-25-2008, 03:41 PM   #6
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Quote:
Originally Posted by Drunkensatyr View Post
Throw the sample in the freezer for about 10 min then adjust for temp when it gets 90º or lower.
This is what I do as well. For me anyway, the whole purpose of a preboil reading is to find out if I need to make adjustments before I start the boil.

I think that this is what you're looking for:

http://www.ebrew.com/primarynews/ct_...correction.htm
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Old 07-25-2008, 04:20 PM   #7
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I chill a sauce pan in the freezer before I start the mash.
It has enough mass to cool a cup of wort down PDQ.

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Old 07-25-2008, 05:21 PM   #8
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I would put it in the freezer when I had that issue. Now I use my refractometer.

I found though, that most of the time my numbers are insanely consistent and I don't need to worry about preboil gravity. I just take it now because the refractometer is fun.

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Old 07-25-2008, 05:29 PM   #9
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I set it in the fridge in labeled cups along with 1st and 2nd running cups. while the BK is coming to boil I take the readings then dump them into the boil. my #'s are fairly consistent from batch to batch runnings also, I do it simply to check efficiency.

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Old 07-25-2008, 06:29 PM   #10
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I haven't had good luck adjusting for temperature, so I started cooling my samples, but I quickly got tired of that so I bought a refractometer..

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