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Old 11-21-2013, 01:54 PM   #1
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Default Wort correction factor on brewersfriend. I dont understand one thing about it.

I have just gone through the steps on how to calculate the wort correction factor for a refractometer (it is available on brewersfriend)

The part that confuses me is the one people, and to be specific...it is the part that I highlighted.

"We recommend at least 30 samples from several different unfermented worts. Only unfermented wort is appropriate for this test, because alcohol throws off the refractometer reading.

Filling out the spreadsheet will also tell how accurate the refractometer is in general. 5x refractometer measurements from 6 different worts provide a nice wide sample. Some cheaper refractometers report wide ranges (2-3 points) sample to sample from the same wort. In that case, the average of several samples should always be taken before recording the gravity in your brew log."

Does this mean that I need to brew about 6 batches and use my refractometer 5 different on each batch to get the final wort correction factor?
Can I measure the Brix 5 times at different times in the same batch or it has to be 5 subsequent measures?

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Old 11-21-2013, 01:56 PM   #2
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It should be different batches.

BUT, you can just do it once to get an idea of it and still use it. Mine didn't change much at all in the first few batches. After that I stopped doing it.

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Old 11-21-2013, 02:02 PM   #3
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It should be different batches.

BUT, you can just do it once to get an idea of it and still use it. Mine didn't change much at all in the first few batches. After that I stopped doing it.
Can I just simply make a mini-batch in one of my pots that I use in the kitchen (I am asking because I have no DME readily available now) and just test it in that one....to get at least an idea for my initial 1st batch before brewing it?
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Old 11-21-2013, 02:06 PM   #4
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Can I just simply make a mini-batch in one of my pots that I use in the kitchen (I am asking because I have no DME readily available now) and just test it in that one....to get at least an idea for my initial 1st batch before brewing it?
You can- but it's not necessary. For the first batch, just compare it to the hydrometer and then you'll know. It's generally a very small number, and doesn't really make that much of a difference in the actual OG in my experience.
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Old 11-21-2013, 05:21 PM   #5
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It's probably worth having a look at http://www.brewersfriend.com/2013/04...ome-brewing/to understand the reason for their recommendations.
In that article, they state:
"Cheap refractometers are not very consistent measurement to measurement from the same wort. I take 5+ measurements then average the value before recording. The variance is +/- 10% either way! What a joke. You get what you pay for and this unit was a gift."
This would explain why they took 5 readings from each batch, and averaged the readings to get a single input to the calculator. I usually just take a single reading, and check the results from my calculator. Very occasionally, I will take another reading if my calculator shows an unexpected gravity value, or if I forget the reading before getting to the calculator. I think that his refractometer is faulty, but next time I brew I will take multiple readings and see if I can detect any difference.
I do notice that the Brix reading drops a bit if I add hot wort to the refractometer and read the results immediately, but it stabilizes as the wort cools down, and I read the results after about 1 minute (by which time the reading is stable).
As you need a hydrometer to calculate the correction factor, you should use the hydrometer for your next brew and just use the refractometer to calculate the correction factor. For subsequent brews (once the correction factor has been calculated) you can use the refractometer alone, but it's still probably worthwhile to use both instruments for a few brews to average the correction factor.

-a.

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