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ukhomebrew
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 Posted: 31 Oct 2005 20:28 Post subject: Refractometer choice |
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Philip Tebbs wrote:
| Quote: |
Go onto EBay and just search for Refractometer, and look for those sold by
Instruments Depot, and you'll not go far wrong!
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Just done that and am considering the 0-20 Brix for accuracy readings.
One question whats the conversion between Brix / Plato / SG And where do
I switch it on in Promash :)
Ideally Is 20% Brix within my normal brewing range of 1.038 - 1.060
--
le Man ( The Brewer Formerly Known As Aleman )
Mashing In Blackpool, Lancashire, UK
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Philip Tebbs
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| Posted: 31 Oct 2005 21:04 Post subject: Refractometer choice |
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I use a simple equation to convert brix to SG, not exact but near enough for
general calculation. SG=1+(0.004x%Brix) so 20% Brix would be 1.080º SG.
There's more accurate ways, but this does for most of my needs. Go onto the
BYO website and search for Refractometers, there's a really good article on
there that explains it all, and has all the accurate equations and
calculations to adjust readings for your brewery.
Hope this helps
Philip
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ukhomebrew
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| Posted: 31 Oct 2005 21:18 Post subject: Refractometer choice |
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Philip Tebbs wrote:
| Quote: |
I use a simple equation to convert brix to SG, not exact but near enough for
general calculation. SG=1+(0.004x%Brix) so 20% Brix would be 1.080º SG.
There's more accurate ways, but this does for most of my needs. Go onto the
BYO website and search for Refractometers, there's a really good article on
there that explains it all, and has all the accurate equations and
calculations to adjust readings for your brewery.
|
Thanks Phil,
Found it in Promash as well
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le Man ( The Brewer Formerly Known As Aleman )
Mashing In Blackpool, Lancashire, UK
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Andrew Smith \(I\)
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Andrew Smith \(I\)
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Andrew Smith \(I\)
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| Posted: 01 Nov 2005 0:27 Post subject: Refractometer choice |
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| Quote: |
Just done that and am considering the 0-20 Brix for accuracy readings.
One question whats the conversion between Brix / Plato / SG
And where do
I switch it on in Promash :)
Ideally Is 20% Brix within my normal brewing range of 1.038 - 1.060
|
I just ordered the 0-32 brix model as it has scales divs and acyuracy of
0.2brix which is les than 0.001 grav so better than any hydrometer normally
used and 32 brix means I can use it in stronger wines too.
I was given a VERY old refractomiter yesterday by Richard at cheers but
unfortunately it is not apropriate as it seesm to be scaled for calculating
alcahol content in a finished beverage by using the refractomiter scale
reading (god knows the units) and a measured gravity with a hydromiter,
usefull I guess if you did not kone what the OG was of the liquid. But not
what I thought it was
Andrew Smith (I) ICQ 27792652 (Mashing in Tilehurst Nr Reading)
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Ed Howell
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| Posted: 01 Nov 2005 16:16 Post subject: Refractometer choice |
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| Quote: |
One question whats the conversion between Brix / Plato / SG And where do
I switch it on in Promash 
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Tony, In Promash click on the load session button, pick the recipe that you
are brewing and then click on Fermentation. On lower right you will see to
refractometer emblems, the top is for OG and the bottom is for FG. All you
need to do at this point is add the brix reading and it will convert it to
specific gravity. When I first got by refractometer last year I checked it
against hydrometer readings and it was right on.
The 0 to 20 brix will work on anything up to a 1.080 OG brew, if you are
planing on doing and barleywines or some of the other higher gravity ales
you might want to consider one that will read 0 to 32 brix.
Cheers,
Ed
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ukhomebrew
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| Posted: 01 Nov 2005 16:34 Post subject: Refractometer choice |
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Ed Howell wrote:
| Quote: |
The 0 to 20 brix will work on anything up to a 1.080 OG brew, if you are
planing on doing and barleywines or some of the other higher gravity ales
you might want to consider one that will read 0 to 32 brix.
|
Thanks Ed,
I have just ordered one of the 0-20 Brix as I so rarely brew high
Gravity beers that it will be more than adequate for my purposes. If I
do decide to brew anything stronger, I can always take a sample, dilute
it with distilled water (say by 50%) and then take a reading. It may be
a bit awkward compared to just plonking it on but as I said the number
of beers I brew at that range are very small, so I consider the increase
in scale divisions just more useful
--
le Man ( The Brewer Formerly Known As Aleman )
Mashing In Blackpool, Lancashire, UK
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Ed Howell
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cardinal.badger
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Jeff Renner
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| Posted: 03 Nov 2005 15:27 Post subject: Refractometer choice |
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"Andrew Smith \(I\)" <uk-homebrew@somethingfunnyandshort.co.uk> wrote:
| Quote: |
I was given a VERY old refractomiter yesterday by Richard at cheers
but
unfortunately it is not apropriate as it seesm to be scaled for
calculating
alcahol content in a finished beverage by using the refractomiter
scale
reading (god knows the units) and a measured gravity with a
hydromiter,
usefull I guess if you did not kone what the OG was of the liquid.
But not
what I thought it was
|
If it has a scale for Refractive Index (RI), it is useful. This
scale will have numbers something like 1.3460. ProMash will convert
RI to Brix/Plato/SG. Or, I have a pocket sized chart which I could
scan and send you.
Jeff
---
Jeff Renner in Ann Arbor, Michigan USA, jsrennerATumichDOTedu
"One never knows, do one?" Fats Waller, American Musician, 1904-1943
***Please note new address***
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Andrew Smith \(I\)
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| Posted: 03 Nov 2005 16:00 Post subject: Refractometer choice |
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| Quote: |
If it has a scale for Refractive Index (RI), it is useful. This
scale will have numbers something like 1.3460. ProMash will convert
RI to Brix/Plato/SG. Or, I have a pocket sized chart which I could
scan and send you.
|
It does as far as I know from the booklet with it measure refractuive index
but the scale starts at 10 and goes to 140. RO water reads 15 which is what
the leaflet says distilled water should read foir calibration purposes. So
what might this scal;e actually be reading?
Andrew Smith (I) ICQ 27792652 (Mashing in Tilehurst Nr Reading)
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Andrew Smith \(I\)
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| Posted: 03 Nov 2005 16:10 Post subject: Refractometer choice |
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| Quote: |
what might this scal;e actually be reading?
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Looking at the refractomiter tools in Promash and experimenting with RO
water and sugar (I know it is not wort which is probably why the figures
don't tally properly) I think the scale is calibrated in Zeiss
As RO water gives 15 which converted to brix with promash shoul be 14.5
1032 water+sugar gives 42 on the refractomiter and acording to promash 1032
would be 46.5 Zeiss and 42 Siess wiould be 1027
1072 water+sugar gives 80 on the refratomiter which acording to promash
should be 89.3 zeiss and 80 zeiss is 1063
So it is not beyond the realm of posibility that these figures corrected for
wort instaed of water+sugar would be correct.
However does this mean that any refractomiter regardless of what the scale
is can only be used with the figures converted to something else for a
specific type of liquid and presumable not all worts would have excactly the
same conversion fgactor?
Andrew Smith (I) ICQ 27792652 (Mashing in Tilehurst Nr Reading)
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