Jody,



If I remember correctly, the meter I purchased cost me $230.00 at Pikes.
That 7.0 / 6.8 number combination doesn¡¯t make any sense. Typical of
calibration test fluids, they should be fixed at 7.0 or 4.01 with a strong
buffer to hold it at those two ph¡¯s. The calibration process is a
chemical / electrical alignment procedure of the meter¡¯s electrical
circuitry in conjunction with the measuring probe. After the meter is
calibrated, those two calibration fluids should read 7.0 or 4.01 with the
meter in read mode. If the readings of the meter are outside the
percentage of accuracy when measuring the 7.0 or 4.01 calibration fluids, I
would call whoever you purchased the meter from and tell them you want a
replacement meter because the one you have is failing to read the
calibration fluids within the guaranteed accuracy defined for the meter.



Best Regards,

Thomas Giannou

http://www.tandjenterprises.com <http://www.tandjenterprises.com/> -
Supplier of High Brix Garden Supplies.



_____

From: RBTI@yahoogroups.com [mailto:RBTI@yahoogroups.com] On Behalf Of Jody
Troupe
Sent: Sunday, June 28, 2009 5:16 PM
To: RBTI@yahoogroups.com
Subject: Re: [RBTI] Test equipment - pH meters








Hi Thomas-

Thanks for the feedback. I guess my pH solution is 7.0 also, like
yours, but in a tiny inscription right next to the large number "7" is
written "6.8".
Whereas the tiny inscription next to the 4.01 solution actually
matches and says 4.01.

I thought that meant the solution was referred to as a pH of 7, but in
actuality was 6.8 at 25¢ªC. I never asked anyone about it. I just
thought saying 6.8 would be more accurate. (??)

Can I assume the "titration solution method" means the reagents? I can
see the colors easily enough to trust it. At least I'll know I'm in
the ballpark vs. that meter! Recently it started flashing the CAL
icon, so I knew something was up, but that only happened very recently
which is why I sought out some verification.

I appreciate having the reagents as a check-n-balance kind of thing,
but I would really like to be able to use my meter.

Is the B-213 more expensive than the Cardy Twin? I thought spending
$225 was enough to insure a good meter, but maybe I needed to spend
more?

I'll try my meter again tomorrow. I was sort of disgusted with it
since I just thought that straight out of the foil envelope I would
finally have something that was spot-on. Instead it was still goofy.

Thanks again for the feedback.

Jody

On Jun 28, 2009, at 7:29 PM, Thomas Giannou wrote:

>
>
> Jody,
>
> I have a Horiba B-213 pH meter from Pike Agri Lab, but the calibrating
> solutions are 7.0 and 4.01. After calibration, mine reads the two
> control
> solutions perfectly. Yours should also.
>
> I find the titration solution method totally unreliable. I can't see
> the
> colors. Thus I bought an expensive pH meter.
>
> Best Regards,
>
> Thomas Giannou
>
> http://www.tandjent <http://www.tandjenterprises.com> erprises.com
<http://www.tandjent <http://www.tandjenterprises.com/> erprises.com/> For
> High Brix Garden Supplies.
>
> _____
>
> From: RBTI@yahoogroups. <mailto:RBTI%40yahoogroups.com> com
[mailto:RBTI@yahoogroups. <mailto:RBTI%40yahoogroups.com> com] On Behalf
> Of Jody
> Troupe
> Sent: Sunday, June 28, 2009 12:40 PM
> To: RBTI@yahoogroups. <mailto:RBTI%40yahoogroups.com> com
> Subject: [RBTI] Test equipment - pH meters
>
> I have a question for all RBTI practitioners-
>
> Has anyone else had significant inaccuracies with their pH meters?
>
> I've had my Cardy Twin pH meter for about 3 1/2 yrs. (its not a cheap
> one) I finally bought the pH reagents to check the accuracy of my pH
> meter.
> I had suspected my meter was off, and as per the reagents, it was
> waaaaay off.
>
> This is what I've done so far:
>
> I calibrate it with both the 6.8 and 4.01 solutions whenever I use it.
> I even double checked my calibrating solutions with the reagents to
> make sure my calibrating solutions were ok. (and they were).
> The meter is kept indoors without fluctuating temperatures.
> I tried the "saturate the sensor with calibration fluid and leave it
> there for 2+ hrs" as per the pamphlet that came with the meter. That
> didn't fix anything.
> I changed the batteries.
>
> So, as a last resort, I ponied up the $100 to buy a new sensor. And
> THAT didn't do it!
>
> I have not tried saturating this new sensor for 2+ hrs yet because I
> figured it was a new sensor and shouldn't need that. But, I can try
> that.
>
> I would WELCOME suggestions! I don't want this meter to be an
> expensive piece of junk! The reagents are fine, but I also find the pH
> meter convenient for travel.
>
> I already wrote to Pike to inquire, but I don't expect any answer
> until at least tomorrow.
>
> Thank you any suggestions.
>
> JodyT
>
> On Jun 28, 2009, at 10:42 AM, RH wrote:
>
> >
> >
> > Someone wrote privately...
> >
> > > I am in the Abilene, Texas area. Is there a practitioner nearby?
> > > I assume it can all be done long distance but relationships are
> > > important and something is always lost in this medium/internet.
> >
> > First, any consultant near Abilene should do a public shout-out so
> > this person can see their email address and write back. I hate
> having
> > to do it this way, but we have to respect people's privacy.
> >
> > This person is interested in obtaining test equipment and learning
> to
> > do their own tests. Obviously, if they cannot attend class in person
> > then they need to look into an online class. A starting point is
> > always to review the teacher brochures in the Files area. There are
> > millions upon millions of people who need to talk with a trained
> > consultant and I think it makes sense to talk to teachers so as to
> get
> > names of reliable consultants.
> > http://health.
> <http://health. <http://health.groups.yahoo.com/group/RBTI/files/-
RBTI%20TEACHER%20BROCHURES> groups.yahoo.com/group/RBTI/files/-
RBTI%20TEACHER%20BROCHURES
> /> groups.yahoo.com/group/RBTI/files/-RBTI%20TEACHER%20BROCHURES/
> >
> > Someone who merely wants to gain some familiarity with RBTI ways and
> > means could do worse than review the online films I have on the
> > internet. Anyone who has reviewed the films soon enough realizes
> that
> > I am not trying to teach people how to do something. Instead I am
> > trying to show how much variation there is out there that produces
> the
> > same consistent reliable results. Proper analysis is proper
> > analysis---there is scant room for inaccurate testing.
> > http://video. <http://video.
<http://video.google.com/videosearch?q=rex> google.com/videosearch?q=rex>
> google.com/videosearch?q=rex
> > +harrill&hl=en&emb=0&aq=f#q=rex+harrill+rbti&hl=en&emb=0
> >
> > Regards,
> > Rex Harrill
> >
> >
>
> [Non-text portions of this message have been removed]
>
> [Non-text portions of this message have been removed]
>
>
>

[Non-text portions of this message have been removed]





[Non-text portions of this message have been removed]