Thanks pfabsits and Martin. I never actually wipe the bulb but usually blot the end of the probe so it's possible that it touches the paper towel, no more blotting. I'll also re-look at the probe info on the Bru'n Water Facebook page.
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I had the same problem when using the pH56. Try shaking it 2-3 times hard like your trying to shake off all liquid from the probe after the 7 and before the 4 calibration. Worked for me. No idea why.Next time I'll try giving it a good shake in between.
Sure is better than letting it drip dry all over your pants!
If the beer was soured in the kettle and THEN boiled you will have no issues bringing these fermenters (and using them again) into your brewhouse. The reason being that the boil will have killed off any potential souring microorganisms prior to being racked to your fermenter. You will however need to pitch some sort of yeast (either brett or sacch) to finish off the fermentation process at home.
If you desire a minimal amount of sourness (and at pH of 3.2 it probably is already pretty darn sour), then I would recommend pitching some sort of neutral ale yeast that can handle a low pH (i.e. WY 1007, or even US-O5). You can then go about treating this brew as a normal fermentation.
I had the same problem when using the pH56. Try shaking it 2-3 times hard like your trying to shake off all liquid from the probe after the 7 and before the 4 calibration. Worked for me. No idea why.
There can be mulitple reasons as why the pH meter is not holding its calibration. They include:
Coating on glass electrode: Any coating that forms on the electrode will change the value the meter displays when in the pH buffer. Typically, the change would affect all buffers, so a change that is observed in pH 4 would also be observed in pH 7. This type of change is known as an offset error.
Contaminated buffer:The calibration of a pH meter is as only as good as the buffer. If a pH buffer value changes then the value displayed will change. Typically a contaminated buffer will affect only one calibration point. This will change the slope of the electrode. This should not be a problem as long as the buffers are fresh (less than 6 months old) and changed frequently. For example place buffer in a small baby food jar for daily calibration and change out at least once/week.
After using a cleaning solution it is important to place the probe in storage solution for 2-3 hours before performing a calibration.
Rinse the probe with purified water (distilled, reverse osmosis, deionized) water when moving the probe from one solution to another. For example I have my probe in storage solution then I would rinse and then place in a calibration buffer. If performing a two point calibration then rinse between buffers. After calibration rinse. After taking a reading rinse before placing back in storage solution.
Always store the probe in a solution. It is important to maintain the hydrated layer on the glass and keep the junction hydrated as well. If you do not use storage solution then use pH4. If you do not have pH 4 then use pH 7. Storage solution has microbial inhibitors to keep stuff from growing on the glass. pH 4 is the next recommendation since bacteria do not grow well at lower pH's. For this reason pH 4 is recommended over pH 7. NEVER store in purified water.
pH probes do not last forever. They have a life of 1-2 years. If you have a pH meter with a mV mode the offset/slope can be checked. As long as the offset/slope is acceptable then the probe can be used indefinitely.
We looked at electric hoists too, but I have 2 chest freezers in 2 different locations and the rope hoist is lightweight and easy to just clip on an eye bolt or the garage door rail.
Would it be possible to put the freezer on its side or on its end? I assume it would still work, but I don't know.
if the meter shows signs of erratic or slow stabilization, its usually a good time to use the very acidic cleaning solution on the probe (think its 2.0 or less). if you still have issues, could be probe needs replaced.
As I understand it, rinsing in distilled water is best instead of tap water. Could the battery be getting low?