Author Topic: Refractometer Sale  (Read 7019 times)

Online mtnrockhopper

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Refractometer Sale
« on: July 05, 2013, 09:40:23 AM »
Jimmy K

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Offline SecondRow_Sean

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Re: Refractometer Sale
« Reply #1 on: July 05, 2013, 09:52:07 AM »
Purchased!

Online reverseapachemaster

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Re: Refractometer Sale
« Reply #2 on: July 05, 2013, 07:13:25 PM »
Really good deal! I love my refractometer. When brewing small batches it's a huge deal to be able to take gravity readings without having to fill the cylinder to take a hydrometer reading.
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Online HoosierBrew

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Re: Refractometer Sale
« Reply #3 on: July 05, 2013, 07:28:17 PM »
I've got one but I may get another at that price.  The exact same one I have, and I love mine.
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Re: Refractometer Sale
« Reply #4 on: July 05, 2013, 07:37:47 PM »
I would urge you all to check the refractometer against a hydrometer.
Life begins at 60.....1.060, that is!

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Offline klickitat jim

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Re: Refractometer Sale
« Reply #5 on: July 05, 2013, 07:45:02 PM »
I use refraction up to the point that the boil is done and chilled then I use hydrometer

Online HoosierBrew

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Re: Refractometer Sale
« Reply #6 on: July 05, 2013, 07:54:21 PM »
I use refraction up to the point that the boil is done and chilled then I use hydrometer
I use mine pre-fermentation only too.  I calibrate mine each time, and check it against my hydrometer pretty regularly.  I know there are conversions for FG readings, but I prefer the old hydrometer there.
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Re: Refractometer Sale
« Reply #7 on: July 05, 2013, 08:04:39 PM »
There's also a great article about refractometers in this month's Zymurgy... Coincidence?
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Online HoosierBrew

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Re: Refractometer Sale
« Reply #8 on: July 05, 2013, 08:07:56 PM »
Read it.  The author seemed pretty knowledgeable  ;)
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Online mtnrockhopper

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Re: Refractometer Sale
« Reply #9 on: July 05, 2013, 08:14:00 PM »
I would urge you all to check the refractometer against a hydrometer.

Na. I'm just going to walk away and assume it all goes to plan. Sharks with frickin laser beams.

Jimmy K

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Offline klickitat jim

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Re: Refractometer Sale
« Reply #10 on: July 05, 2013, 08:48:16 PM »
I don't have iodine, so for me it's an ok way to check conversion in the mash. I ball park what it ought to be and aim for that. When I'm close with no change in 15 minutes I figure its done. With beers around 1.060 that's usually 60-90 minutes. Strange huh?

Online mtnrockhopper

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Re: Refractometer Sale
« Reply #11 on: July 05, 2013, 09:05:19 PM »
I don't have iodine, so for me it's an ok way to check conversion in the mash. I ball park what it ought to be and aim for that. When I'm close with no change in 15 minutes I figure its done. With beers around 1.060 that's usually 60-90 minutes. Strange huh?

At a minimum, that is a unique logic flow.

Jimmy K

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Offline klickitat jim

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Re: Refractometer Sale
« Reply #12 on: July 05, 2013, 09:22:26 PM »
For example (I think)
10# of 2 row should be about 370 points
Divided by 5 gallons mash water should be 1.074 max.
80% would be about 1.060 or 15°
So if I hit 15° and stay there 15 min I figure it's converted.

Am I wrong or crazy? Not experienced enough to really know, it's just how I've been doing it.

Offline erockrph

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Re: Refractometer Sale
« Reply #13 on: July 05, 2013, 10:26:32 PM »
I've been wanting to add a refractometer to my toolkit for a while now. Thanks for the tip!
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Offline malzig

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Re: Refractometer Sale
« Reply #14 on: July 06, 2013, 07:47:53 AM »
I've only used a few refractometers, but they have all been accurate to a calibrated Hydrometer.  Most hydrometers that I have owned were inaccurate before calibration.

Be aware that there has long been a problem with many, if not all, dual-scale refractometers that have both an SG and Brix scale.  There has been an ongoing problem where they all seemed to have an incorrect SG scale.  Hopefully that has been fixed, but it may be why they are on sale.
For example (I think)
10# of 2 row should be about 370 points
Divided by 5 gallons mash water should be 1.074 max.
80% would be about 1.060 or 15°
So if I hit 15° and stay there 15 min I figure it's converted.

Am I wrong or crazy? Not experienced enough to really know, it's just how I've been doing it.
The math is wrong, since you don't account for the volume added by the dissolved sugar from the converted grain, but the answer is close enough. 

Max gravity for 10# of base malt in 5 gallons of mash water is probably just under 1.065.  You can figure out your target gravity with a pretty simple formula (I'd change the 37 to a 36 if there is much specialty malt in there):
Max points per gallon from mash = (# of grain*37)/(mash volume in gallons+(0.075 gallons*# of grain))