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• ## Re: Pot still- high %-age product?

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• A hydrometer is only accurate at 20C (60F) you must measure it at that temp or use a chart to correct for it. Warm alcohol will measure high. Cold alcohol will
Message 1 of 14 , Oct 6, 2006
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A hydrometer is only accurate at 20C (60F) you must measure it at that
temp or use a chart to correct for it. Warm alcohol will measure high.
Cold alcohol will measure low.
• You meant to say 68F ... :-) Link ... __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam
Message 1 of 14 , Oct 6, 2006
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You meant to say '68F'... :-)

--- rocky_creek1 <rocky_creek@...> wrote:

> A hydrometer is only accurate at 20C (60F) you must
> measure it at that
> temp or use a chart to correct for it. Warm alcohol
> will measure high.
> Cold alcohol will measure low.
>
>
>
>
>

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• ... Most are calibrated at 60F, or about 16C. DC
Message 1 of 14 , Oct 6, 2006
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On Fri, 6 Oct 2006 06:25:54 -0700 (PDT), you wrote:

>You meant to say '68F'... :-)
>

Most are calibrated at 60F, or about 16C.

DC
• Let s see... 3.5 gal = 13,265 ml x 10% (Alc) = 1, 326 ml of 200 proof (100%) alcohol IN the wash. If you are able to claim 90% of that yields 1,193 ml of 200
Message 1 of 14 , Oct 6, 2006
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Let's see...
3.5 gal = 13,265 ml x 10% (Alc) = 1, 326 ml of 200
proof (100%) alcohol IN the wash.
If you are able to claim 90% of that yields 1,193 ml
of 200 proof. You stated that your avg collection is
44%. This means that you probably collected approx
2720 ml total.
Next observation is for 6 hrs run = approx 8
ml/minute. That's a little slow for a stripping run.
I have two alembics pots, one 24" tower (run pot)
with leibig condenser. They all run differently. It
took a few runs of each to fine tune.

I always calculate the total alcohol volume in a wash
to keep track of where i am in the process. I
calculate every cut how much alcohol I've pulled off
so far, how much is still in the wash to pull, etc.

--- "marquee.moon" <marquee.moon@...> wrote:

> I have recently distilled for the first time using a
> pot still, and
> I'm confused by the %ABV I am getting -to high?
>
> The still is: 3.5 gallon SS stockpot, 28mm x 450mm
> Cu column, de-
> liebigs condenser;
> column & pot insulated. The condenser sits at around
> 30 degrees below
> horizontal. The heat is via a small gas ring, fully
> open for heat up,
> turned right down to almost no flame for
> distillation
> My wash was 10% sugar base. I was collecting `low
> wines'. The
> objective was to get a feel for how the still works
> before I run
> anything decent through it.
>
> I took careful measurements using a thermometer at
> column and hydrometer on the product.
> I recorded that my first half litre came over
> between 80-85
> I finished my
> run at 95centigrade, at which point the discharge
> was 19% ABV. In the
> collection vessel, the cumulative percentage at the
> end of the run
> was 44%. The entire distillation took 6 hours.
>
> Using Tony Acklands Pot still calculations, my
> observations don't
> stack up. According to his "pot still purity"
> calculator, a 10% wash
> comes over at 49% at 93c and drops to 2% at 99.9c,
> with the final
> product yielding 23 %
> I've played around with the different parameters,
> and the only way I
> can approach my results using his model is to
> increase the initial
> wash strength to around 22%. I definitely didn't
> make a high ABV
> wash.
>
> I have considered the possibility that my alcohol
> hydrometer is
> reading inaccurately, but the temperatures roughly
> match up with the %
> ABV (70% at 85 centigrade)
> The other thing I've considered is that my 10% wash
> boils at 93
> centigrade in the pot, then between the pot and the
> condenser there's
> about 1.5 effective plates, resulting in a small
> amount of increased
> purity, with a corresponding alteration in head
> temperature.
>
> So what's happening? , and how can I take this
> forward into my
> understanding of the still for future runs?
>
>
>
>
>
>

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• Alcohol is corrected to 68F (20c) as refered in Harry s site. See Articles Alcoholometer Correction Table by Geoff Redman
Message 1 of 14 , Oct 6, 2006
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Alcohol is corrected to 68F (20c) as refered in
Harry's site. See 'Articles' Alcoholometer Correction
Table by Geoff Redman
http://distillers.tastylime.net/library/Listings2.htm#Books%20Listings
And ASTM standards.

--- dcrawford@... wrote:

> On Fri, 6 Oct 2006 06:25:54 -0700 (PDT), you wrote:
>
> >You meant to say '68F'... :-)
> >
>
> Most are calibrated at 60F, or about 16C.
>
> DC
>
>

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• ... The statement was: A hydrometer is only accurate at 20C (60F) you must measure it at that temp or use a chart to correct for it. Warm alcohol will
Message 1 of 14 , Oct 6, 2006
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On Fri, 6 Oct 2006 07:21:08 -0700 (PDT), you wrote:

>Alcohol is corrected to 68F (20c) as refered in
>Harry's site. See 'Articles' Alcoholometer Correction
>Table by Geoff Redman
>http://distillers.tastylime.net/library/Listings2.htm#Books%20Listings
> And ASTM standards.
>

The statement was:
<<snip>>
A hydrometer is only accurate at 20C (60F) you must measure it at that
temp or use a chart to correct for it. Warm alcohol will measure high.
Cold alcohol will measure low.
<<snip>>

As I understand it, a hydrometer is only accurate at the temperature
at which it was calibrated, and not all are calibrated at 20C(68F).
the need for a correction table. And then you should 'normalize' your

Comment welcome, Harry. :-)

DC
• DC, The alcohol (proof) hydrometer is, indeed, calibrated at 68 F( 20C). Reading at another temps are not inaccurate, just considered an observed reading at
Message 1 of 14 , Oct 6, 2006
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DC,

The alcohol (proof) hydrometer is, indeed, calibrated
at 68 F( 20C). Reading at another temps are not
inaccurate, just considered an 'observed' reading at
observed temp which needs to be converted to 'as if'
it were 68F.
Specific Gravity is corrected to 60F (20c) for net

--- dcrawford@... wrote:

> On Fri, 6 Oct 2006 07:21:08 -0700 (PDT), you wrote:
>
> >Alcohol is corrected to 68F (20c) as refered in
> >Harry's site. See 'Articles' Alcoholometer
> Correction
> >Table by Geoff Redman
>
>http://distillers.tastylime.net/library/Listings2.htm#Books%20Listings
> > And ASTM standards.
> >
>
> The statement was:
> <<snip>>
> A hydrometer is only accurate at 20C (60F) you must
> measure it at that
> temp or use a chart to correct for it. Warm alcohol
> will measure high.
> Cold alcohol will measure low.
> <<snip>>
>
> As I understand it, a hydrometer is only accurate at
> the temperature
> at which it was calibrated, and not all are
> calibrated at 20C(68F).
> Used at another temperature, you have to correct
> the need for a correction table. And then you should
> 'normalize' your
> readings to 20C(68F) for consistancy.
>
> Comment welcome, Harry. :-)
>
> DC
>
>

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• Oops.. my faw-paw 60F = 15.6C Link ... __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam
Message 1 of 14 , Oct 6, 2006
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Oops.. my faw-paw

60F = 15.6C

> DC,
>
> The alcohol (proof) hydrometer is, indeed,
> calibrated
> at 68 F( 20C). Reading at another temps are not
> inaccurate, just considered an 'observed' reading at
> observed temp which needs to be converted to 'as if'
> it were 68F.
> Specific Gravity is corrected to 60F (20c) for net
>
>
>
> --- dcrawford@... wrote:
>
> > On Fri, 6 Oct 2006 07:21:08 -0700 (PDT), you
> wrote:
> >
> > >Alcohol is corrected to 68F (20c) as refered in
> > >Harry's site. See 'Articles' Alcoholometer
> > Correction
> > >Table by Geoff Redman
> >
>
>http://distillers.tastylime.net/library/Listings2.htm#Books%20Listings
> > > And ASTM standards.
> > >
> >
> > The statement was:
> > <<snip>>
> > A hydrometer is only accurate at 20C (60F) you
> must
> > measure it at that
> > temp or use a chart to correct for it. Warm
> alcohol
> > will measure high.
> > Cold alcohol will measure low.
> > <<snip>>
> >
> > As I understand it, a hydrometer is only accurate
> at
> > the temperature
> > at which it was calibrated, and not all are
> > calibrated at 20C(68F).
> > Used at another temperature, you have to correct
> > the need for a correction table. And then you
> should
> > 'normalize' your
> > readings to 20C(68F) for consistancy.
> >
> > Comment welcome, Harry. :-)
> >
> > DC
> >
> >
>
>
> __________________________________________________
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> Tired of spam? Yahoo! Mail has the best spam
> protection around
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• ... Link, I m afraid DC is correct. Not all alcoholometers are calibrated at the same base temperature. In fact the one I use is calibrated at 15 degC. The
Message 1 of 14 , Oct 6, 2006
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wrote:
>
> DC,
>
> The alcohol (proof) hydrometer is, indeed, calibrated
> at 68 F( 20C). Reading at another temps are not
> inaccurate, just considered an 'observed' reading at
> observed temp which needs to be converted to 'as if'
> it were 68F.
> Specific Gravity is corrected to 60F (20c) for net
>

I'm afraid DC is correct. Not all alcoholometers are calibrated at
the same base temperature. In fact the one I use is calibrated at
15 degC.

The charts on my site by Geoff were formulated for a alcoholometer
calibrated at 20 degC. I put them up , not for accuracy or use with
all alcoholometers, but rather to show HOW a set of charts is
formulated and derived.

In the first page of that article, Geoff shows how he arrived at a
mathematical formula to produce charts. He chose a 20 degC
alcoholometer as the test instrument to prove his findings, having
compared them to published charts. Anyone can use the same
formula/methods and a spreadsheet to make charts for an instrument
that's got a different baseline. This could be very handy for
someone who has lost/misplaced the chart that came with their
the years.

Hope this clears it up.

Slainte!
regards Harry
• ... The point that seems to be getting missed is that 60F does NOT convert to 20C. If you have 60F, it converts to 15.5C 20C converts to 68F, not 60F.
Message 1 of 14 , Oct 6, 2006
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At 11:53 AM 10/06/2006, you wrote:

>Specific Gravity is corrected to 60F (20c) for net reading.

The point that seems to be getting missed is that 60F does NOT convert to 20C.

If you have 60F, it converts to 15.5C

20C converts to 68F, not 60F.
• Harry and DC I stand corrected! All of the alcoholometer that i have encountered have been calibrated to 68 F (20c). The ASTM Standards that I ve subscribed to
Message 1 of 14 , Oct 6, 2006
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Harry and DC I stand corrected!

All of the alcoholometer that i have encountered have
been calibrated to 68 F (20c). The ASTM Standards that
I've subscribed to have indicated the same. I made an
assumption that all were calibrated to 68F.

Please accept my appology DC. I do not want to

Thanks for the clarification Harry.

--- Harry <gnikomson2000@...> wrote:

> --- In new_distillers@yahoogroups.com, Link D'Antoni
> wrote:
> >
> > DC,
> >
> > The alcohol (proof) hydrometer is, indeed,
> calibrated
> > at 68 F( 20C). Reading at another temps are not
> > inaccurate, just considered an 'observed' reading
> at
> > observed temp which needs to be converted to 'as
> if'
> > it were 68F.
> > Specific Gravity is corrected to 60F (20c) for
> net
> >
>
>
>
> I'm afraid DC is correct. Not all alcoholometers
> are calibrated at
> the same base temperature. In fact the one I use is
> calibrated at
> 15 degC.
>
> The charts on my site by Geoff were formulated for a
> alcoholometer
> calibrated at 20 degC. I put them up , not for
> accuracy or use with
> all alcoholometers, but rather to show HOW a set of
> charts is
> formulated and derived.
>
> In the first page of that article, Geoff shows how
> he arrived at a
> mathematical formula to produce charts. He chose a
> 20 degC
> alcoholometer as the test instrument to prove his
> findings, having
> compared them to published charts. Anyone can use
> the same
> formula/methods and a spreadsheet to make charts for
> an instrument
> that's got a different baseline. This could be very
> handy for
> someone who has lost/misplaced the chart that came
> with their
> instrument, as indeed we've had several queries
> the years.
>
> Hope this clears it up.
>
>
> Slainte!
> regards Harry
>
>
>
>
>

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• Thanks for your responses. I forgot about the temperature adjustment- I ll remember that in future. I distil outside in northern England, and collect direct
Message 1 of 14 , Oct 9, 2006
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future. I distil outside in northern England, and collect direct into
my hydrometer jar. At the speed I was collecting and with the outdoor
temperatures we have (today its 10 centigrade), by the time I have
collected 150ml, the spirit is quite cool anyhow. Certainly, the final
reading of 44% was taken on cool spirit.
But for the sake of a temperature reading and adjustment, I should make
sure.

I like the idea of keeping track of the theoretical volume I should
have collected- thanks for that hint.

I appreciate that my speed was a little slow- I'm still learning and
I'd rather take it easy, get to know my still and get things right.
However, next time I should be able to increase the heat slightly.