General Category > Equipment and Software
How to use a pH meter
punatic:
Yes, probe storage solution is the best way to store your pH probe.
However, if you only have a choice of distilled (deionized) water or leaving the probe in the air to dry out, choose keeping the probe wet. Allowing it to dry out will ruin the probe quickly. Parking the probe in deionized water for a few hours to keep it from drying out will not cause problems. Parking it in a pH buffer temporaily is a better option still.
redzim:
--- Quote from: redzim on March 29, 2012, 11:53:51 AM ---
--- Quote from: narvin on March 24, 2012, 07:51:01 PM ---Did they try replacing the probe? I have the MW 102 and haven't really had any problems with it. When you see the hour glass go away, you should be able to take a reading. It may drift a little after that, but not by as much as you're seeing. You should be moving the probe around slowly as you take the reading; otherwise, diffusion from the probe can affect the sample directly in contact with it.
I pulled mine out of the storage solution after a month and the 4.01 solution reading was dead on, and the 7.01 read around 6.98.
--- End quote ---
I got to Milwaukee tech support again today and they agree that my meter seems flaky. They are going to replace it free of charge so we'll see if that helps.
--- End quote ---
I have to give a big +1 to Milwaukee on this one; after a lot of tech calls they agreed to replace the entire meter and probes for free. I must have had a lemon, because the replacement I got has been much more solid; it calibrates a lot quicker (2-3min vs 8-10min) and hardly drifts at all in samples (maybe 0.1pH over a couple minutes max). Also holds its calibration nicely, when I haven't used it for a few weeks I check it in a 4.01 buffer before recalibrating and it is always between 3.98 and 4.04. Which my old meter never was.... so although Milwaukee's QA on their product line might not be the best, their customer service is nice.
-red
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