pH Meter

pH Meter

Post by NomDeNett » Thu, 24 Sep 1998 04:00:00



Where can one purchase a good winemaking pH meter without mortgaging one's
home?  Unfortunately a gardener's pH meter is precluded for winemaking
purposes due to the acidic pH ranges applicable to winemaking (2.80 - 3.50).

I've become obsessed with the idea of basing SO2 additions on the must's pH
and the amount of free SO2 already present.  I've come to believe that using
"ballpark" SO2 additions or basing SO2 additions on anything else (like a
recipe) is just "shooting in the dark".

To do this correctly one needs very accurate pH readings (the paper strips
just don't hack it!)

Thanks in advance.

-Ed
--
"Wine is sunlight, held together by water..."
 -Louis Pasteur

 
 
 

pH Meter

Post by Georg » Thu, 24 Sep 1998 04:00:00


Quote:

>Where can one purchase a good winemaking pH meter without mortgaging one's
>home?

Depends on how much you get for your mortgage. I have seen hand-held pH
meters in the Fisher Scinetific catalog for a couple hundred dollars, cheap
by professional laboratory standards but perhaps a bit much for home
winemakers. SOmetimes government labs or universities will sell old
equipment, I have seen pH meters practically thrown away. However you have
to consider the condition of the electrode...in normal laboratory use
electrodes will wear out and need to be replaced every few years, more often
if not properly maintained. The electode alone can cost 50 bucks or more. So
if buying a used meter try and check it out and make sure it is in good
working condition.

George

 
 
 

pH Meter

Post by Chad T. Johnso » Sat, 26 Sep 1998 04:00:00


Nom -
 Define mortage- I purchased mine from Cole-Parmer Instrument Co. in Vernon
Hills,IL.
for about $  63.00. This meter is temp. compensated and is simple to use
(digital readout and calibration) model# 59000-20. They have a model that is not
temp-comp avail for about
53.00, but for 10.00, I'd go w/ the first. Their phone# is1-800-323-4340. They
also have a
good applications help-line if you have questions.
Good Luck,Chad
Quote:

> Where can one purchase a good winemaking pH meter without mortgaging one's
> home?  Unfortunately a gardener's pH meter is precluded for winemaking
> purposes due to the acidic pH ranges applicable to winemaking (2.80 - 3.50).

> I've become obsessed with the idea of basing SO2 additions on the must's pH
> and the amount of free SO2 already present.  I've come to believe that using
> "ballpark" SO2 additions or basing SO2 additions on anything else (like a
> recipe) is just "shooting in the dark".

> To do this correctly one needs very accurate pH readings (the paper strips
> just don't hack it!)

> Thanks in advance.

> -Ed
> --
> "Wine is sunlight, held together by water..."
>  -Louis Pasteur

 
 
 

pH Meter

Post by NomDeNett » Sat, 26 Sep 1998 04:00:00


Chad:

Thanks!  Excellent!

Do you have any idea of the accuracy of the meter you describe?

I want to be sure that the meter is accurate to at least 0.05 pH, as my SO2
addition chart shows significant differences in the amount of SO2 required
with must pHs which are only .1 pH apart.

Many of the "entry level" pH meters are only accurate to .2 pH.  (In other
words; a reading of 3.1 might be anywhere from 2.9 to 3.3)

Thanks Much.
-Ed
--
"Wine is sunlight, held together by water..."
 -Louis Pasteur

 
 
 

pH Meter

Post by Chad T. Johnso » Sat, 26 Sep 1998 04:00:00


NOM,
the meter i bought has a resolution of  +/- 0.1 ph unit and an accuracy of +/-
0.1 ph unit, this
is catalog # p59000-20 ( ph tester 2) $63.50.  They have another meter(ph
tester3) catalog
# p-59000-30 that has same resolution but an accuracy of +/- 0.02 ph units for
$ 95.50.
  They  also have some that are completely waterproof that have same res and
accuracy
as the one I own for 85.00, w/ the benefit you can buy replacement electrodes
for the latter.
I should tell you that repl. elec are not available for the first two models,
who knows why?
Cole- Parmer will send you a catalog for free and will answer any questions you
have over
the phone i.e, calibrating,res./accu. etc.
  Happy Hunting, let me know if u have trouble contacting them, Chad
Quote:

> Chad:

> Thanks!  Excellent!

> Do you have any idea of the accuracy of the meter you describe?

> I want to be sure that the meter is accurate to at least 0.05 pH, as my SO2
> addition chart shows significant differences in the amount of SO2 required
> with must pHs which are only .1 pH apart.

> Many of the "entry level" pH meters are only accurate to .2 pH.  (In other
> words; a reading of 3.1 might be anywhere from 2.9 to 3.3)

> Thanks Much.
> -Ed
> --
> "Wine is sunlight, held together by water..."
>  -Louis Pasteur