When using a pH meter, do you stir the probe in your liquid, or do you hold it
still? Dumb question, but thanks.
Ken

Ken Anderson wrote:
When using a pH meter, do you stir the probe in your liquid, or do you hold it
still? Dumb question, but thanks.
Ken


Being the delicate probe a pH probe is, I prefer not to stir with it.
I just swish my liquid in my beaker and gently lower the probe into it.

Regards,
Gene

Ken Anderson wrote:
When using a pH meter, do you stir the probe in your liquid, or do you hold it
still? Dumb question, but thanks.
Ken


Being the delicate probe a pH probe is, I prefer not to stir with it.
I just swish my liquid in my beaker and gently lower the probe into it.

Regards,
Gene

"gene" wrote in message
.. .
Ken Anderson wrote:
When using a pH meter, do you stir the probe in your liquid, or do you
hold it
still? Dumb question, but thanks.
Ken


Being the delicate probe a pH probe is, I prefer not to stir with it.
I just swish my liquid in my beaker and gently lower the probe into it.

Regards,
Gene


Thank you Gene. I am trying to figure out why I got 3 different readings in a
row. Tomato sauce, actually. I calibrated, tested. Recalibrated, tested.
Recalibrated, tested. Even if my pH 4 and pH 7 fluids were old, I'd expect
repeatability. Two place resolution, +/- .04 accuracy. I got 4.41, 4.16, and
4.30.
Ken

"gene" wrote in message
.. .
Ken Anderson wrote:
When using a pH meter, do you stir the probe in your liquid, or do you
hold it
still? Dumb question, but thanks.
Ken


Being the delicate probe a pH probe is, I prefer not to stir with it.
I just swish my liquid in my beaker and gently lower the probe into it.

Regards,
Gene


Thank you Gene. I am trying to figure out why I got 3 different readings in a
row. Tomato sauce, actually. I calibrated, tested. Recalibrated, tested.
Recalibrated, tested. Even if my pH 4 and pH 7 fluids were old, I'd expect
repeatability. Two place resolution, +/- .04 accuracy. I got 4.41, 4.16, and
4.30.
Ken

"Ken Anderson" wrote in message
...
I am trying to figure out why I got 3 different readings in a
row. Tomato sauce, actually. I calibrated, tested. Recalibrated,
tested.
Recalibrated, tested. Even if my pH 4 and pH 7 fluids were old, I'd
expect
repeatability. Two place resolution, +/- .04 accuracy. I got 4.41, 4.16,
and
4.30.

Personally, I'm from the "stir gently, wait, stir again and wait until the
reading stabilizes" school. I do this when running standards too. It takes
time for the reading to settle to a final value. Also, the time required to
stabilize will lengthen with age of the probe. Supposedly, contact lens
enzyme cleaner helps restore/clean dirty probes.

BTW, I had trouble with flaky connections between the probe and body of my
Hanna Piccolo, so I soldered jumper wires between the sets of contacts.
That did the trick.

Tom S

"Ken Anderson" wrote in message
...
I am trying to figure out why I got 3 different readings in a
row. Tomato sauce, actually. I calibrated, tested. Recalibrated,
tested.
Recalibrated, tested. Even if my pH 4 and pH 7 fluids were old, I'd
expect
repeatability. Two place resolution, +/- .04 accuracy. I got 4.41, 4.16,
and
4.30.

Personally, I'm from the "stir gently, wait, stir again and wait until the
reading stabilizes" school. I do this when running standards too. It takes
time for the reading to settle to a final value. Also, the time required to
stabilize will lengthen with age of the probe. Supposedly, contact lens
enzyme cleaner helps restore/clean dirty probes.

BTW, I had trouble with flaky connections between the probe and body of my
Hanna Piccolo, so I soldered jumper wires between the sets of contacts.
That did the trick.

Tom S

Ken Anderson wrote:
"gene" wrote in message
.. .

Ken Anderson wrote:

When using a pH meter, do you stir the probe in your liquid, or do you

hold it

still? Dumb question, but thanks.
Ken



Being the delicate probe a pH probe is, I prefer not to stir with it.
I just swish my liquid in my beaker and gently lower the probe into it.

Regards,
Gene



Thank you Gene. I am trying to figure out why I got 3 different readings in a
row. Tomato sauce, actually. I calibrated, tested. Recalibrated, tested.
Recalibrated, tested. Even if my pH 4 and pH 7 fluids were old, I'd expect
repeatability. Two place resolution, +/- .04 accuracy. I got 4.41, 4.16, and
4.30.
Ken


Hmmm.... could the solids in the tomato sauce have gummed up the pH
sensor electrode so that it is not being flushed adequately between
readings? I wouldn't expect recalibration to get you back to the
start if there's a barrier to solution transport across a tomato solids
layer.
You have an interesting dilemma. Any gurus out there to help?
Gene

Do you use probe cleaning fluid to clean the probe once in a while. I find
that that will help consistence.

Ray
"gene" wrote in message
m...
Ken Anderson wrote:
"gene" wrote in message
.. .

Ken Anderson wrote:

When using a pH meter, do you stir the probe in your liquid, or do you

hold it

still? Dumb question, but thanks.
Ken



Being the delicate probe a pH probe is, I prefer not to stir with it.
I just swish my liquid in my beaker and gently lower the probe into it.

Regards,
Gene



Thank you Gene. I am trying to figure out why I got 3 different readings
in a
row. Tomato sauce, actually. I calibrated, tested. Recalibrated,
tested.
Recalibrated, tested. Even if my pH 4 and pH 7 fluids were old, I'd
expect
repeatability. Two place resolution, +/- .04 accuracy. I got 4.41, 4.16,
and
4.30.
Ken


Hmmm.... could the solids in the tomato sauce have gummed up the pH sensor
electrode so that it is not being flushed adequately between readings?
I wouldn't expect recalibration to get you back to the start if there's a
barrier to solution transport across a tomato solids layer.
You have an interesting dilemma. Any gurus out there to help?
Gene

"Ray Calvert" wrote in message
...
Do you use probe cleaning fluid to clean the probe once in a while. I find
that that will help consistence.


I have only used it once, which was last season. I stored the probe in the
little tip it came in, submersed in whatever solution that is (KNO3?). The
instructions say to soak it in 7 pH calibration fluid for several minutes to
freshen it up. I didn't do that but will next time. I did use distilled
water for my probe rinsing. In truth, I must admit that the calibration
solutions I used this year, were left over from LAST year, stored in little
Mason jars. I have "fresh" packets of 4.0 and 7.0 from last year. I'll at
least break those out and try again.
Ken

That sounds pretty old, mine go bad in 2 to 3 months. If you see mold
or 'floatsies', they are bad.

Maybe see if you can find a supplier of Hydrion capules. They come in
a pak of 10 of 4, 7, and 10. All you do is add them to 100 ml of
distilled water and add 3 drops of preservative. Mine last 2 months,
so that's over a years worth for around $20.

I do not use distilled to rinse, I use tap water. Either deionized or
distilled is hard on pH probes, I can't remember just now.

Joe

In truth, I must admit that the calibration
solutions I used this year, were left over from LAST year, stored in little
Mason jars. I have "fresh" packets of 4.0 and 7.0 from last year. I'll at
least break those out and try again.
Ken

I get a special cleaning solution that you can soak you probe in. I think
it is very acidic. It make a real difference. I suggest you look into
getting some. Also, I forgot to ask if you were storing it in storage
soluton. This too can make a difference.

Ray

"Ken Anderson" wrote in message
...
"Ray Calvert" wrote in message
...
Do you use probe cleaning fluid to clean the probe once in a while. I
find
that that will help consistence.


I have only used it once, which was last season. I stored the probe in
the
little tip it came in, submersed in whatever solution that is (KNO3?).
The
instructions say to soak it in 7 pH calibration fluid for several minutes
to
freshen it up. I didn't do that but will next time. I did use distilled
water for my probe rinsing. In truth, I must admit that the calibration
solutions I used this year, were left over from LAST year, stored in
little
Mason jars. I have "fresh" packets of 4.0 and 7.0 from last year. I'll
at
least break those out and try again.
Ken

I get a special cleaning solution that you can soak you probe in. I think
it is very acidic. It make a real difference. I suggest you look into
getting some. Also, I forgot to ask if you were storing it in storage
soluton. This too can make a difference.

Ray

"Ken Anderson" wrote in message
...
"Ray Calvert" wrote in message
...
Do you use probe cleaning fluid to clean the probe once in a while. I
find
that that will help consistence.


I have only used it once, which was last season. I stored the probe in
the
little tip it came in, submersed in whatever solution that is (KNO3?).
The
instructions say to soak it in 7 pH calibration fluid for several minutes
to
freshen it up. I didn't do that but will next time. I did use distilled
water for my probe rinsing. In truth, I must admit that the calibration
solutions I used this year, were left over from LAST year, stored in
little
Mason jars. I have "fresh" packets of 4.0 and 7.0 from last year. I'll
at
least break those out and try again.
Ken

Ray - What is the solution and where do you get it?
Bill Frazier
Olathe, Kansas USA

"Ray Calvert" wrote in message
...
I get a special cleaning solution that you can soak you probe in. I think
it is very acidic. It make a real difference. I suggest you look into
getting some. Also, I forgot to ask if you were storing it in storage
soluton. This too can make a difference.

Ray

"Ken Anderson" wrote in message
...
"Ray Calvert" wrote in message
...
Do you use probe cleaning fluid to clean the probe once in a while. I
find
that that will help consistence.


I have only used it once, which was last season. I stored the probe in
the
little tip it came in, submersed in whatever solution that is (KNO3?).
The
instructions say to soak it in 7 pH calibration fluid for several
minutes
to
freshen it up. I didn't do that but will next time. I did use
distilled
water for my probe rinsing. In truth, I must admit that the calibration
solutions I used this year, were left over from LAST year, stored in
little
Mason jars. I have "fresh" packets of 4.0 and 7.0 from last year. I'll
at
least break those out and try again.
Ken

Ray - What is the solution and where do you get it?
Bill Frazier
Olathe, Kansas USA

"Ray Calvert" wrote in message
...
I get a special cleaning solution that you can soak you probe in. I think
it is very acidic. It make a real difference. I suggest you look into
getting some. Also, I forgot to ask if you were storing it in storage
soluton. This too can make a difference.

Ray

"Ken Anderson" wrote in message
...
"Ray Calvert" wrote in message
...
Do you use probe cleaning fluid to clean the probe once in a while. I
find
that that will help consistence.


I have only used it once, which was last season. I stored the probe in
the
little tip it came in, submersed in whatever solution that is (KNO3?).
The
instructions say to soak it in 7 pH calibration fluid for several
minutes
to
freshen it up. I didn't do that but will next time. I did use
distilled
water for my probe rinsing. In truth, I must admit that the calibration
solutions I used this year, were left over from LAST year, stored in
little
Mason jars. I have "fresh" packets of 4.0 and 7.0 from last year. I'll
at
least break those out and try again.
Ken