Pocket Refractors, any good?

[Aleman]

Note that the conversion in the scale above only applies for unfermented wort. If the wort has been fermenting then you MUST use the formulae to convert the brix reading.

 

[timbim]

Note that the conversion in the scale above only applies for unfermented wort. If the wort has been fermenting then you MUST use the formulae to convert the brix reading.

Where can you get hold of the formulae?

 

[Aleman]

Note that the conversion in the scale above only applies for unfermented wort. If the wort has been fermenting then you MUST use the formulae to convert the brix reading.

Where can you get hold of the formulae?

Unfortunately I can't remember . . .but make good use of the refractometer utilities in promash . . . For those of you that don't have Promash there are the online calculators like this one

 

[timbim]

Note that the conversion in the scale above only applies for unfermented wort. If the wort has been fermenting then you MUST use the formulae to convert the brix reading.

Where can you get hold of the formulae?

Unfortunately I can't remember . . .but make good use of the refractometer utilities in promash . . . For those of you that don't have Promash there are the online calculators like this one

I don't want a calculator, I want theory! Don't say I'm going to need to go and derive some expressions myself... My attempts to do that for ABV calculations have been pretty unsuccessful...

 

[kebabman]

A few posts ago I wrote concerning the software on the webpage that Aleman has just mentioned.

The section for converting Brix during fermentation, assuming that I have entered the neccessary figures correctly, gives a FG of 1005 from a brix of 6.2 which seems way too low whilst The Beer Engine gives a more likely 1016 for my strong beer.

This was for a 1055 OG beer. any comments anyone please as the website just doesn't seem right compared with Graham's Beer Engine software.

 

[Aleman]

I don't want a calculator, I want theory! Don't say I'm going to need to go and derive some expressions myself... My attempts to do that for ABV calculations have been pretty unsuccessful...

Oh go on then try these in this article

 

[jodrell]

I don't want a calculator, I want theory! Don't say I'm going to need to go and derive some expressions myself... My attempts to do that for ABV calculations have been pretty unsuccessful...

This should work for you then...http://en.wikipedia.org/wiki/Brix

 

[Ceejay]

Dammit! I'm going to have to spend more money now :lol: :nono:

 

[jodrell]

mine was just under 20 quid from eBay...well worth it :-)

 

[evanvine]

What is the accurate conversion for Brix to SG?
I know it is approximately 4, but according to Scream's pic it is nearer 3.914! :wha:
I would like the accurate figure to draw up my own conversion spreadsheet. :geek:
Trawling the web, I can't find any two that concur.

 

[hairybiker]

I know it is approximately 4, but according to Scream's pic it is nearer 3.914! :wha:

When I was at school we were taught how to "guestimate" (in the Higher (A level to you southerners) maths class no less) and to me 3.914 is 4 :thumb:

Are you really that bothered that your masterpiece is say 1058.71 rather than 1060? (assuming a brix of 15) I don't think that I could taste the difference :whistle:

 

[evanvine]

When I was at school we were taught how to "guestimate" (in the Higher (A level to you southerners) maths class no less) and to me 3.914 is 4 :thumb:

Are you really that bothered that your masterpiece is say 1058.71 rather than 1060? (assuming a brix of 15) I don't think that I could taste the difference :whistle:

I take it you don't know then!

 

[Sean_Mc]

HERES a link to a video and below it an Excel spreadsheet, one for beer and another for wine, to check the SG while fermenting

 

[Aleman]

What is the accurate conversion for Brix to SG?
I know it is approximately 4, but according to Scream's pic it is nearer 3.914! :wha:
I would like the accurate figure to draw up my own conversion spreadsheet. :geek:
Trawling the web, I can't find any two that concur.

But it depends on the conversion figure (from sucrose to maltose) . . . while 1.04 is generally accepted as the mean for this, it is actually brew house dependant and can be from 1.01 to 1.09 . . .

The article I linked to does discuss this . . . plus provides the generally accepted formulae for use in the brewery . . . You can always try a further search for Louis Bonhams work on refractometer conversions, to get the real deal . . .Although I still just multiply by 4 :lol:

 

[evanvine]

Thanks SM and Tony, HB was right when he said I was being pedantic.