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Old 08-20-2012, 02:08 AM   #1
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Default pH Meter Storage Solution

Ok Guys, I have a quick question. I just got a Milwaukee MW 101 pH meter, and it’s as much fun as a new toy can be. My problem is that the owner’s manual puzzles me.

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Immerse the tip (2.5cm) of the pH electrode into the sample and stir gently.

After completing measurements, switch the meter off and store the electrode with a few drops of storage solution (MA9015) in the protective cap.
Here’s my question; If I need to stick this thing an inch into the solution to get a good reading, how is a few drops of storage solution going to do anything?

Is there a downside to immersing it? You know, ten drops instead of a few.
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Old 08-20-2012, 02:49 AM   #2
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Quote:
Originally Posted by Wynne-R View Post
Ok Guys, I have a quick question. I just got a Milwaukee MW 101 pH meter, and it’s as much fun as a new toy can be. My problem is that the owner’s manual puzzles me.



Here’s my question; If I need to stick this thing an inch into the solution to get a good reading, how is a few drops of storage solution going to do anything?

Is there a downside to immersing it? You know, ten drops instead of a few.
Does it have a piece of foam in the cap?
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Old 08-20-2012, 03:15 AM   #3
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No, it's more like the finger of a rubber glove, about an inch and a quarter long.

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Old 08-20-2012, 03:34 AM   #4
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I keep my Hanna meter probe submerged in solution. The salts in it creep out of the cap and it requires refilling if not used often. Id put more than less solution if it were mine.

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Old 08-20-2012, 03:41 AM   #5
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The idea is to keep the bulb from drying out. The cap is doubtless designed to trap the moisture from the solution. This is sufficient. Potassium chloride creep is a most interesting phenomenon. I think helium close to absolute 0 is the only other substance that exhibits it. You should replenish the storage solution from time to time because of the creep. Immersion will not, AFAIK, harm the bulb. I always store my electrodes with the bulb immersed and I've been getting 2 or more years life out of them.

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Old 08-20-2012, 03:48 AM   #6
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Thanks RC, AJ.

As long as it doesn’t go dry, we’re good, apparently. Odd the way they worded it. Usually manufacturers are very careful about stuff like that.

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Old 08-20-2012, 04:00 AM   #7
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Quote:
Originally Posted by Wynne-R View Post
Thanks RC, AJ.

As long as it doesn’t go dry, we’re good, apparently. Odd the way they worded it. Usually manufacturers are very careful about stuff like that.
Ive seen that wording when the cap has a foam plug in it. "Add a couple drops to the foam..."
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Old 08-20-2012, 07:48 PM   #8
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Quote:
Originally Posted by ajdelange View Post
The idea is to keep the bulb from drying out. The cap is doubtless designed to trap the moisture from the solution. This is sufficient. Potassium chloride creep is a most interesting phenomenon. I think helium close to absolute 0 is the only other substance that exhibits it. You should replenish the storage solution from time to time because of the creep. Immersion will not, AFAIK, harm the bulb. I always store my electrodes with the bulb immersed and I've been getting 2 or more years life out of them.
What about cheap e-bay pH meters, do you think it is wort to buy storage solutions for them or it is simpler to buy new one from time to time?
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Old 08-20-2012, 08:01 PM   #9
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I tend to avoid e-bay (there are just too many uncertainties) and cheap meters as well. I think you are better off buying a decent meter from a trusted supplier and treating it according to its manufacturers recommendations.

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Old 08-21-2012, 05:45 AM   #10
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I was afraid of this answer, but the truth is painful... I"ll have to satisfied with this one until I decide to spend $120 on Hanna phep 5 (which is price in my country).

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