Will taking hydrometer readings ruin my beer?

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Will taking hydrometer readings ruin my beer?

Postby volteface » Thu Feb 11, 2010 2:57 am

I got a brewing kit for Christmas. I started my first brew on Jan 8. I live in a house with all hardwood floors so it stays cool in my house. My brew has stayed around 60-62 degrees this whole time. I was told by my local brew shop to take a hydrometer reading, which of course I have never done. I have a few questions. I am brewing a Grand Cru Belgian from bewferm.
1. How do I take hydrometer reading?
2. I read on my brew book that I need to test a small amount in a cylinder. Will I ruin my brew by opening the container?
3. How will I know if my brew is fermenting?
Needless to say I am a little nervous. Any help is much appreciated.

Michael
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Re: Will taking hydrometer readings ruin my beer?

Postby Wild » Thu Feb 11, 2010 7:29 am

It is a very simple tool for checking the specific gravity of a liquid. The hydrometer is simply a sealed glass tube with a weight at the bottom and a graduated scale along the neck. The hydrometer reads specific gravity of a liquid in comparison with water. If you place the hydrometer in plain water it would read a density of 1.00
In a nutshell the hydrometer is reading the quantity of solids that are dissolved in your beer.
When you first put your wort in primary and take the specific gravity reading it is called your Original Gravity (OG) or your Starting Gravity (SG).
When you check your gravity reading at the end of fermentation, it's called your Final Gravity (FG) or your Ending Gravity (EG).
Using a hydrometer when making beer
It is pretty easy to use a hydrometer. You can just put it right into the beer and look at it. Look at where the top surface of the beer is and take a reading off the scale of the hydrometer.
Having Trouble trying to figure out how to get your hydrometer into and out of your carboy?
Most hydrometers come in a plastic tube that is made for the reading of fluids. Want a neat and clean way to read your hydrometer? This test jar is perfect. Extract a little bit of your beer and put it in this jar. Perfect for testing specific gravity. Just put your hydrometer right in it. What you do is use a wine thief (I use a turkey baster) to extract the beer from your carboy and fill up the plastic tube with it. You place your hydrometer in that and take your reading.
Why use a hydrometer?
The important thing about the hydrometer is that it will enable you to know whether your beer is fermenting properly. So, as time goes by you should see the specific gravity of your beer falling.
I personally won't bother with my hydrometer until after secondary should be complete. The less I play with the beer the better I feel. But you may be on a schedule or just out of patience so check your beer every week and insure the gravity is still falling. If it stops falling for 3 days, fermentation is complete. You can bottle/keg when ready.
Further Notes about your Hydrometer
It sounds basic but you really should read the instructions that come with your Hydrometer. Most hydrometers have several scales on them and it is pretty common for it to have three different (and very useful) scales. The first scale will read the Specific Gravity. The second scale will read the alcohol content. The third scale will read the sugar content. So make sure you use the right scale.
Looking to Buy a Hydrometer?
- Product Description
This triple scale hydrometer is 10.5" long and provides specific gravities between 0.990 - 1.160, potential alcohol by volume of 0-20%, and sugar per liter scale of 0-35. The instructions and plastic case are included with this product.
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Re: Will taking hydrometer readings ruin my beer?

Postby Stihler » Thu Feb 11, 2010 6:18 pm

Here is a webpage I came across which describes how to read a hydrometer and has some nice illustrations.: http://www.grapestompers.com/articles/hydrometer_use.htm

By the way, in terms of taking hydrometer reading I only take a reading of the wort's original gravity. This allows to be judge whether or not I hit my target gravity. If I am way off then I may need to take remedial measures when I transfer the wort to the secondary fermenter.

At any rate, I generally avoid opening the fermenter as much as possible. Activity on the airlock is a pretty good indicator of how the fermentation is progressing and has no associated risk of contamination.

Don't get me wrong a lot of people regularly check the gravity of their beer as fermentation progresses with no ill effects. I don't believe it is worth the risk but....

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Re: Will taking hydrometer readings ruin my beer?

Postby GuitarLord5000 » Thu Feb 11, 2010 7:25 pm

Like Stihler, I usually only take an OG reading of my beer. I'm not really worried about contamination, I just don't think it really helps me as a brewer to hover over a fermenting batch and worry over the numbers. Given enough time and the proper conditions, the yeast usually will take care of business without any help from me.
However, for a large beer like a belgian dark strong, I might take a FG reading immediately after fermentation, to make sure I got the attenuation I expected from my mash parameters. I believe that the kit you purchased is not an all grain kit, so I don't think you really need to worry about it. I tend to think that FG readings are taken when you have a problem with your beer, or you really need to check your mash fermentability.
If you are set on taking a reading, go with either of Wild's approaches. Sanitize the hydrometer (with a bit of string attached if you're using a carboy) and drop the hydrometer directly in your bucket to take a reading. Use the string to fish the hydrometer out if you're using a carboy.
Personally, I'd use either a sanitized wine thief or Wild's turkey baster to remove a sample from the fermenter and take a reading. You shouldn't return this sample to your fermenter once it's been removed. I prefer this method, because I can taste the sample to really get an idea of what's going on with the beer.
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Re: Will taking hydrometer readings ruin my beer?

Postby volteface » Fri Feb 12, 2010 3:16 am

Thanks guys. What does the reading need to be at? I never took a reading previously. Unfortunately I have not been able to keep a close watch on the brew because I have been in and out of town. Again the help is very appreciated.
Cheers!
Michael
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Re: Will taking hydrometer readings ruin my beer?

Postby GuitarLord5000 » Fri Feb 12, 2010 3:38 am

I would imagine that the kit you purchased would have had that info. If not, it's sorta a tough call. If you started at 1.075 OG (this is what the kit says your OG should have been) and you brewed an 8% ABV beer (from the kit info), your FG should be around 1.014.

Are you seeing any bubbling out of your airlock?
Here's to a long life and a merry one
A quick death and an easy one
A pretty girl and an honest one
A cold beer and another one

Cheers,
Dave

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http://www.deadyeast.com
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Re: Will taking hydrometer readings ruin my beer?

Postby luv2brew » Fri Feb 26, 2010 10:16 pm

I imagine by this time you probably have bottled, I didnt see any mention of temperature to test the gravity in the previous postings..!!!!! the wort should be at 60 deg F if the wort is not at 60 deg F a correction factor must be used to obtain the correct gravity. OG is important: to watery ???? to heavy???? only OG will tell.
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