My new Milwaukee pH56 - calibration issues? - Home Brew Forums

Register Now!
Home Brew Forums > Home Brewing Beer > Brew Science > My new Milwaukee pH56 - calibration issues?

Reply
 
Thread Tools
Old 08-19-2012, 02:55 PM   #1
periwinkle1239
Recipes 
 
Apr 2011
St. Louis, Missouri
Posts: 357
Liked 5 Times on 5 Posts



So I bought myself a Milwaukee pH 56 and am really excited to try improving my quality by understanding/controlling the mash pH.

I believe I followed the instructions that came with the meter to calibrate it (I can post them if needed) but afterward I let it sit in the 4.01 calibration solution and the meter reads 3.91. Is that right? It sounds like I'm off by 0.10. Likewise when I move it to the 7.01 solution it was reading 6.89.

Before I calibrated it, it was reading exactly 4.00 in the solution so I'm wondering if I should've even bothered trying to calibrate.

I also read the sticky on here which is a bit more detailed and has a few more steps such as rinsing the electrode with DI water, so I may try that next time I calibrate.

 
Reply With Quote
Old 08-19-2012, 03:44 PM   #2
ajdelange
HBT_LIFETIMESUPPORTER.png
Recipes 
 
Aug 2010
McLean/Ogden, Virginia/Quebec
Posts: 9,146
Liked 1453 Times on 1107 Posts


Go back to the sticky and read up on the stability check part. It is characteristic of inexpensive meters that they aren't stable. It is also characteristic of users new to pH measurement that they don't always get things exactly right the first time out. So do follow the more detailed instructions of that sticky with respect to DI rinses, blotting, fresh buffers etc. If it is up to you to decide when to accept a calibration reading wait a good minute or 2 before accepting and at the completion of the cal, read one of the buffers several times over a period of an hour or so. Some fluctuation is to be expected. We hope that as you, and the meter, get broken in a little you'll get that down to less than 0.1.

 
Reply With Quote
Old 08-19-2012, 04:02 PM   #3
periwinkle1239
Recipes 
 
Apr 2011
St. Louis, Missouri
Posts: 357
Liked 5 Times on 5 Posts


Thanks! When I did my research I think I bought a reputable and somewhat pricey meter, so I think I just need to figure out how to use it correctly to get accurate readings.

 
Reply With Quote
Old 08-19-2012, 07:01 PM   #4
RCCOLA
 
RCCOLA's Avatar
Recipes 
 
Nov 2008
Northwest Arkansas
Posts: 1,068
Liked 96 Times on 58 Posts


I suggest you soak the probe for 24 hrs in storage solution to condition it before using it. Hanna recommends 1 hr, but it wasn't enough for my meter.

My cheap Hanna read .5 off after a 1hr soak. I adjusted it and then placed it in storage solution. After the overnight soak, it read .5 off the other way. I reset it with fresh 7 and 4 buffers. Since then, it hasn't deviated more than .1.

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
pH Meter Calibration ajdelange Brew Science 170 09-22-2016 01:50 AM
Effect of reversing pH meter calibration order afr0byte Brew Science 6 08-19-2012 06:16 PM
Calibration Procedure for Thermometers Wynne-R Brew Science 0 07-27-2012 10:28 PM
hydrometer calibration orcus332 Brew Science 6 09-30-2011 01:03 AM
Hanna vs Milwaukee or Other jescholler Brew Science 16 02-14-2011 01:23 PM


Forum Jump