No, it's only correcting for error in electrical response of the probe at temperatures other than the reference temperature. This ensures that the reading is accurate at any temperature. It does not correct for the fact the pH actually changes as temperature changes due to increased H+ ion dissociation..
+100
OK, pardon my confusion with this topic. I have the Milwaukee 102. Say I have a sample that measures pH at 5.6 and the sample is at 90F. Is that the same as it would be at 68f? (due to the temperature correction feature?)
In short no, the ATC is not compesating for differences in ph based on difference in temperature. You need to measure a room temp sample, the ph will be different at 90* than at 75*.
I just read over this the other night. This is a paragraph from the Water Knwolege page in Bru'n Water:
"Brewers should note that Automatic Temperature Compensating (ATC) pH meters only compensate for the response of the pH meter's electrode at varying temperature. That feature does not compensate for the actual pH shift produced chemically in the mash as mentioned above. All mash pH measurement should be performed at room-temperature. Another consideration is that most pH probes use a thin glass bulb that will be subjected to more thermal stress when inserted into a hot mash and the probe is more likely to fail prematurely. Therefore, ATC-equipped pH meters are not necessary for brewing use since it is important to cool the sample to room temperature to avoid the chemical mash pH variation and damage to the pH probe."