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I use the 4.01 and 7.01 as that spans the range of pH in my brewing, ex elf for some sours and ciders.If one were checking a caustic solution, or using lime to soften water, then having tha 10 for calibration would be great.
Quote from: hopfenundmalz on October 23, 2014, 10:58:21 amI use the 4.01 and 7.01 as that spans the range of pH in my brewing, ex elf for some sours and ciders.If one were checking a caustic solution, or using lime to soften water, then having tha 10 for calibration would be great.makes sense. i wasn't sure or knowledgeable on if 3 points of calibration made for more accurate readings vs. 2 point - sounds like it doesn't.
I use the three point calibration, just because it is recommended... and I use the recommended branded test solutions.I have noticed that the ATC component stabilizes the reading more quickly after the 3 point... as opposed to the 2 point. May not make any practical difference in brewhouse as I seldom see a pH above 6.Milwaukee MW102 with ATC.
Most of the meters in the "modest" pricing range use a 2-point calibration. You either use 4 & 7 or 7 & 10 calibration solutions. An important thing to understand is what those adjustment screws are doing. I just posted a quick summary along with a helpful figure on the Bru'n Water facebook site.https://www.facebook.com/pages/Brun-Water/464551136933908?ref=bookmarks
cool chart. so then since 4 rotates around 7, would it be the same quality of calibration as using 10 -assuming it rotates around 7 and is the same 3 point difference from 7 as 4 is from 7? or is 4 better because the movement around 7 is closer to a brewers PH range?i do have two meters with auto calibration for 4.01 and 7.01 solutions, and one manual 2 point calibration.
It's doubtful that calibrating at 10 and then measuring near 4 would be as accurate due to inevitable nonlinearity in the probe's response across a large range.
Not to hijack the thread (said the hijacker), but how often does everyone actually calibrate their pH meters? Every use? Every few uses? Every few weeks/months? I usually brew about once a month and got a meter (MW101) a couple of months ago; do I need to calibrate every time? Should I try calibrating it every brew session for a while and see whether it needs adjusting or not?
Quote from: leejoreilly on October 25, 2014, 07:05:52 amNot to hijack the thread (said the hijacker), but how often does everyone actually calibrate their pH meters? Every use? Every few uses? Every few weeks/months? I usually brew about once a month and got a meter (MW101) a couple of months ago; do I need to calibrate every time? Should I try calibrating it every brew session for a while and see whether it needs adjusting or not?I calibrate mine every time.