What kind of alcohol tester would you recommend that is that is accrued
enough to use in a Winery.

Moe

Maurice Hamling > wrote:
> What kind of alcohol tester would you recommend that is
> that is accrued enough to use in a Winery.

I presume you meant "accurate enough". Answer: Refractometer

Dick

Wrong answer! Try an "Ebulliometer"

Charlie



Dick Adams wrote:
> Maurice Hamling > wrote:
> > What kind of alcohol tester would you recommend that is
> > that is accrued enough to use in a Winery.
>
> I presume you meant "accurate enough". Answer: Refractometer
>
> Dick

On 14 Feb 2005 23:12:09 -0800, "pcw" > wrote:

> Wrong answer! Try an "Ebulliometer"

Wrong answer! Try a frat party.

:-)

> Charlie
>
>
>
> Dick Adams wrote:
> > Maurice Hamling > wrote:
> > > What kind of alcohol tester would you recommend that is
> > > that is accrued enough to use in a Winery.
> >
> > I presume you meant "accurate enough". Answer: Refractometer
> >
> > Dick
>

---
http://lastliberal.org
Free random & sequential signature changer http://holysmoke.org/sig

"If you feel that you must suffer, then plan your suffering carefully --
as you choose your dreams, as you conceive your ancestors." -- Edward
Abbey

<desertphile@hot mail. com (Desertphile, American Patriot)> wrote in message
...
> On 14 Feb 2005 23:12:09 -0800, "pcw" > wrote:
>
> > Wrong answer! Try an "Ebulliometer"
>
> Wrong answer! Try a frat party.
>
> :-)
>
> > Charlie

LOL!!! If the balcony falls off the house while the party is in
progress, you know it's right! ;-)

> >
> >
> >
> > Dick Adams wrote:
> > > Maurice Hamling > wrote:
> > > > What kind of alcohol tester would you recommend that is
> > > > that is accrued enough to use in a Winery.
> > >
> > > I presume you meant "accurate enough". Answer: Refractometer
> > >
> > > Dick
> >
>
> ---
> http://lastliberal.org
> Free random & sequential signature changer http://holysmoke.org/sig
>
> "If you feel that you must suffer, then plan your suffering carefully --
> as you choose your dreams, as you conceive your ancestors." -- Edward
> Abbey

"Dick Adams" > wrote in message
...
> Maurice Hamling > wrote:
> > What kind of alcohol tester would you recommend that is
> > that is accrued enough to use in a Winery.
>
> I presume you meant "accurate enough". Answer: Refractometer
>
I thought that only gave a percentage of sugar from grape juice. Did I
miss something? (as usual?!)

> Dick

>>
> I thought that only gave a percentage of sugar from grape juice. Did I
> miss something? (as usual?!)
>
>> Dick
>

Yes, it give percentage of sugar and yes you missed something. From the
percentage of sugar that the yeast consume you can determine how much
alcohol they generate. There are tables for this that will give it within a
percent or two. Some people claim they are closer than that but I am not
convinced, especially if you only use the table. For most amateurs this is
good enough. There are instruments that will measure alcohol directly after
fermentation. These are usually beyond most amateurs. You can also send
samples to a lab and they will test it for you. But then why. All you need
is a ball park number to balance your wine. If you would like some
calculation methods with detailed descriptions, you can read "The Unified
Theory of Gravity" by Dr. Ray Calvert, Wine Maker Magazine, April-May, 2004,
or let me have an email address and I will send you a preprint.

Ray

If the truth be known, I believe most of them use no more than the average
winemaker uses. A hydrometer or refractometer to determine sugar content
and a table to determine alcohol. This is especially true on the east
coast. Big wineries, especially on the west coast, will send samples off to
laboratories. Some will use an Ebulliometer, though I am told it is not
really that much more accurate than the tables and the labs use much more
accurate (and expensive) equipment now days.

Ray

"Maurice Hamling" > wrote in message
news:i%fQd.69258$eT5.41821@attbi_s51...
> What kind of alcohol tester would you recommend that is that is accrued
> enough to use in a Winery.
>
> Moe
>
>

Nope!!

Wineries use ebu's!! "Big" wineries use the $20,000 enzymatic
gee-whiz-a-ma-trons the labs do. When a winemaker puts 13.8% on thier
label they make "damn" sure it is not really 14.01% !! Else the Fed's
come over with a BIG citation.

Charlie

The other method not discussed here is to use a proof and tralles
hydrometer in a properly treated sample. It's less expensive and as
accurate as an ebulliometer, but very tedious.

Joe

pcw wrote:
> Nope!!
>
> Wineries use ebu's!! "Big" wineries use the $20,000 enzymatic
> gee-whiz-a-ma-trons the labs do. When a winemaker puts 13.8% on thier
> label they make "damn" sure it is not really 14.01% !! Else the
Fed's
> come over with a BIG citation.
>
> Charlie

Hi Joe,

Thanks for bringing this up!! When I recieved my lab training I read
about such procedures, but we only "practiced" ebulliometry. Zoecklein
mentions a few methods involving distillation (into a Kjeldahl flask?)
of the sample but I don't see "proof and tralles" mentioned. I assume
it is a distillation followed by hydrometer? This would be a special,
close range hydrometer?? My problem with hydrometers for "accurate"
readings is one of "interpretation" of the meniscus ... often no more
accurate than a whole division on the scale. With a mercury
thermometer (as on my ebulliometer) I can interpolate down to a half a
division easily! ... which is 0.05% alcohol. Another difference is the
"efficiency" of a refluxer (ebulliometer) vs a distillation coil. I
use ice water in my refluxer and I believe it returns nearly 100% of
the EthOH to the sample. I don't think a distillation coil is as
efficient. Anyone?

Anyway, any info you have on the method you bring up would be
interesting!!

Thanks,

Charlie
PCW

Hi Charlie,

Both hydrometry and ebulliometry have an uncertainty in the range of
0.3% when measuring alcohol by volume as I recall.

You are right on in your post, a Proof and Tralles hydrometer is
calibrated for measuring proof and ABV (Tralles). You can also get
narrow range Tralless, they make the most sense for wine. I have seen
10 to 15% ABV narrow range hydrometers.

The biggest problem using this method is getting a good seal between
the boiling chamber and the condenser, efficiency doesn't matter since
you distill most of the sample over. It's not like your refluxer in
that sense, but if the seal is bad you can lose the alcohol and get
false low readings.

(By the way, this should NEVER be used to distill for consumption - at
least in the US if anyone is thinking about that. It's not only
illegal it's stupid. Liquor is cheap, impisonment and loss of the
house and everything in it is pretty expensive. It's illegal for more
than tax reasons, there are byproducts of distillation that are
poisonous present using this procedure, it is NOT for consumption. I'm
not going to discuss that further, it's just the reality of the
situation.)

You can get a good hydrometer from Kessler and a whole boiling chamber/
graham condenser setup is usually around $100 US if you are ok with all
that in glass, it can break pretty easily. Out the door it's probably
more like $200 US if the stands, standard volume flask or graduate and
burner need purchased too.

You can use the residue for a disolved solids test if desired too, so
it's a 'multi-tasker'.


Anyway, all you are really trying to do is remove the dissolved solids
in this method by leaving them behind. The main interferences are
sugar, (just like your ebulliometer) and a high acetic acid level.

You start with a standard volume of say 200 ml at 60F, boil most of it
over and restore the volume to 200 ml at 60 F with distilled water and
measure with the special hydrometer.

As to reading the meniscus on the hydrometer, I agree most people can
go wrong when it comes to reading them, it's almost an art.

Unless specifically told otherwise by the manufacturer, the correct
procedure (an abbreviated form of what NIST does follows):

* ensure the hydrometer is very clean and at the same temperature as
the fluid under test, (usually 60 F is prefered)

* measure the temperature of the fluid under test

* spin the hydrometer as it is lowered into the fluid under test.

* ensure no bubbles adhere to the hydrometer

* once it stabilizes, lower the eye below the fluid level and look
straight across, raise the eye level until the ellipse formed by the
fluid boundary just disappears, you are now at the level of the fluid
boundary.

* read the hyrdometer as it passes through this level and apply
temperature corrections if necessary.

(NIST has a PDF on hydrometry available on the web, it does a better
job of explaining this.)

I have a set of DuJardin Salleron hyrometers that specify reading the
top of the meniscus; it's odd but they are precision instruments so I
do what they say with those.

Zoecklien et al and Margalit both have pretty detailed procedures in
recent publications as you mentioned. There is a company in New
Zealand that has a pretty good description on the web too, it might be
Monash or Monarch Scientific, something like that.

HTH.


Joe

pcw wrote:
> Hi Joe,
>
> Thanks for bringing this up!! When I recieved my lab training I read
> about such procedures, but we only "practiced" ebulliometry.
Zoecklein
> mentions a few methods involving distillation (into a Kjeldahl
flask?)
> of the sample but I don't see "proof and tralles" mentioned. I
assume
> it is a distillation followed by hydrometer? This would be a special,
> close range hydrometer?? My problem with hydrometers for "accurate"
> readings is one of "interpretation" of the meniscus ... often no more
> accurate than a whole division on the scale. With a mercury
> thermometer (as on my ebulliometer) I can interpolate down to a half
a
> division easily! ... which is 0.05% alcohol. Another difference is
the
> "efficiency" of a refluxer (ebulliometer) vs a distillation coil. I
> use ice water in my refluxer and I believe it returns nearly 100% of
> the EthOH to the sample. I don't think a distillation coil is as
> efficient. Anyone?
>
> Anyway, any info you have on the method you bring up would be
> interesting!!
>
> Thanks,
>
> Charlie
> PCW

pcw wrote:
> Nope!!
>
> Wineries use ebu's!! "Big" wineries use the $20,000 enzymatic
> gee-whiz-a-ma-trons the labs do. When a winemaker puts 13.8% on thier
> label they make "damn" sure it is not really 14.01% !! Else the
Fed's
> come over with a BIG citation.
>
> Charlie

The precision of the numbers is only an illusion. AFAIK American laws
allow for 1.5% v/v error in alcohol estimation, so something that's
labelled 13.8% can very easily really be 14.5% or more. This is
precisely because the exact number is so hard to measure without very
expensive equipment - not to mention that it might vary from barrel to
barrel, so it will be an average number in any case.

Pp

You missed my point! If a winery "labels" a product at 13.8% (i.e.
submits a COLA and pays excise tax accordingly)...and the wine is
actually >14.00% ...even 14.01% ... they're in BIG TROUBLE!! If they
were to do this repeatedly, they could, and probably WOULD loose their
permit! Every winemaker I know uses an Ebu (or a Lab) to "confirm"
what they put on thier label.

As I recall, the original poster asked about "wineries".

Charlie



pp wrote:
> pcw wrote:
> > Nope!!
> >
> > Wineries use ebu's!! "Big" wineries use the $20,000 enzymatic
> > gee-whiz-a-ma-trons the labs do. When a winemaker puts 13.8% on
thier
> > label they make "damn" sure it is not really 14.01% !! Else the
> Fed's
> > come over with a BIG citation.
> >
> > Charlie
>
> The precision of the numbers is only an illusion. AFAIK American laws
> allow for 1.5% v/v error in alcohol estimation, so something that's
> labelled 13.8% can very easily really be 14.5% or more. This is
> precisely because the exact number is so hard to measure without very
> expensive equipment - not to mention that it might vary from barrel
to
> barrel, so it will be an average number in any case.
>
> Pp

pcw wrote:
> You missed my point! If a winery "labels" a product at 13.8% (i.e.
> submits a COLA and pays excise tax accordingly)...and the wine is
> actually >14.00% ...even 14.01% ... they're in BIG TROUBLE!! If they
> were to do this repeatedly, they could, and probably WOULD loose
their
> permit! Every winemaker I know uses an Ebu (or a Lab) to "confirm"
> what they put on thier label.
>
> As I recall, the original poster asked about "wineries".
>
> Charlie
>

I didn't miss your point and I don't think your info is correct. Yes,
there is a higher tax for 14% and above, but this is based on the label
info, and the law has a pretty big leeway of 1.5% alc. So I don't see
how the wineries could get into trouble if they miss the "real" value
(whatever it is) by 0.2%.

Ebulliometers are imprecise because they are influenced by external
conditions - do some research on this. Even if they were more precise,
how realistic would it be to expect that wineries could adequately
measure their alcohol content to 0.01%?

I am not saying wineries don't use ebulliometers. They're fine
precisely because the law has that big margin of error built into it.

Finally, how would you address my point that the alcohol level is
average by definition because different barrels/batches of the same
wine can differ substantially in their alcohol level, would you want to
do a precise test on every single batch... and print different labels?

All this is to say there is a good reason for the 1.5% leeway. I'm sure
it would have been tighter if it was practical to narrow it down.

Pp

pcw wrote:
> You missed my point! If a winery "labels" a product at 13.8% (i.e.
> submits a COLA and pays excise tax accordingly)...and the wine is
> actually >14.00% ...even 14.01% ... they're in BIG TROUBLE!! If they
> were to do this repeatedly, they could, and probably WOULD loose
their
> permit! Every winemaker I know uses an Ebu (or a Lab) to "confirm"
> what they put on thier label.
>
> As I recall, the original poster asked about "wineries".
>
> Charlie
>

I didn't miss your point and I don't think your info is correct. Yes,
there is a higher tax for 14% and above, but this is based on the label
info, and the law has a pretty big leeway of 1.5% alc. So I don't see
how the wineries could get into trouble if they miss the "real" value
(whatever it is) by 0.2%.

Ebulliometers are imprecise because they are influenced by external
conditions - do some research on this. Even if they were more precise,
how realistic would it be to expect that wineries could adequately
measure their alcohol content to 0.01%?

I am not saying wineries don't use ebulliometers. They're fine
precisely because the law has that big margin of error built into it.

Finally, how would you address my point that the alcohol level is
average by definition because different barrels/batches of the same
wine can differ substantially in their alcohol level, would you want to
do a precise test on every single batch... and print different labels?

All this is to say there is a good reason for the 1.5% leeway. I'm sure
it would have been tighter if it was practical to narrow it down.

Pp

pcw wrote:
> Nope!!
>
> Wineries use ebu's!! "Big" wineries use the $20,000 enzymatic
> gee-whiz-a-ma-trons the labs do. When a winemaker puts 13.8% on thier
> label they make "damn" sure it is not really 14.01% !! Else the
Fed's
> come over with a BIG citation.
>
> Charlie

The precision of the numbers is only an illusion. AFAIK American laws
allow for 1.5% v/v error in alcohol estimation, so something that's
labelled 13.8% can very easily really be 14.5% or more. This is
precisely because the exact number is so hard to measure without very
expensive equipment - not to mention that it might vary from barrel to
barrel, so it will be an average number in any case.

Pp