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I too got some real "interesting" readings the other day with my pH meter while trying to determine a sap value of my glycerin. Never having done it before(or hot process soap), I stopped when the goo got thin(I wasn't expecting it - but I now know it's supposed to happen.) figuring that I messed up. I couldn't make heads or tails out of the readings - the pH of the SAP solution was the same as the soap @ 10.6. I noticed I had a little bit of a bubble in the glass - I guess I hadn't soaked it long enough(It's a brand new meter - single junction). Not sure if I was taking the pH of the soap right either - I was just sticking the meter into it. I know pH meters(especially single junctions) like more fluid materials than soap to read, but other than doing as I did I'm not sure of the way to get the right reading other than making a slurry. Making a slurry has its own challenges - I'm not sure just how to make one in small quantities accurately and quickly for a pH reading. Upon further reading, it appears that there's an electrolite in the glass bulb that's supposed to weap through the glass and that it gets depleted over time. It's recommended to store the meter's buld moist/wet in storage solution(whatever that is). | |||
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My meter worked fine in the beginning and it is only a couple months old.I would just take a little soap and dissolve it in some water and test.I have stored it with the cap on and used the 7 buffer solution in the cap to keep it wet.I did fall asleep a couple of times with the meter in distilled water.It was not left in there for more then 8 hours.It seemed to work after those mishaps.It still reads the buffer just fine.Maybe keeping it soaked in that is the problem.I really wish I knew a way to get it to work again.It made things way easier! | |||
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Bernhardt is right. pH probes contain an electrolyte much like car batteries. KCl, is used as far as I know. Although that fact that your probe is reading too high means the membrane is clogged more often than not... try soaking it in a weak solution of HCl or boric acid that sometimes helps. If that doesn't work try looking up what electrolyte it uses and changes that. We typically changed ours every 6 months regardless but I don't think that's really necessary to be honest | |||
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