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tikiroom
10-26-2010, 08:08 PM
I have a Miller Ph pen that does not adjust for temperature differences.
My question is, does measuring PH at different temperatures give an inaccurate reading.
If so by how much?
keylime
10-26-2010, 11:26 PM
Yes, it does, but I wouldn't worry about it. The difference is so small that it will almost never affect anything in the garden. Most of the time the meter is so much out of calibration that it wouldn't make any difference.

keylime
tikiroom
10-26-2010, 11:29 PM
Thanks for the answer. :jointsmile:
I do calibrate my pen about every two weeks.
The most it has been off was 0.1.
tinytoon
10-27-2010, 10:48 AM
when your water comes out at around 50f and your rez runs around 69f there is quite a bit of difference. Here is one to mess with your head a little, on pens that do not compensate for temp what is the base temp that such pen is set to??
keylime
10-27-2010, 01:35 PM
when your water comes out at around 50f and your rez runs around 69f there is quite a bit of difference. Here is one to mess with your head a little, on pens that do not compensate for temp what is the base temp that such pen is set to??


Well Tiny, I just found a table giving the PH of water at various PHs and the difference between water at 10C and 20 degrees C is less than ONE PPM. I doubt any of us need to get it that close. Once there are some nutes in the water there is a bigger difference, but I don't think we really need to worry about that.

keylime
keylime
10-27-2010, 02:23 PM
Well Tiny, I just found a table giving the PH of water at various PHs and the difference between water at 10C and 20 degrees C is less than ONE PPM. I doubt any of us need to get it that close. Once there are some nutes in the water there is a bigger difference, but I don't think we really need to worry about that.

keylime

I think I need to correct that
The difference between 10c and 20C at a PH of 4 is One Tenth of a PH...... not one PPM, sorry about that.
headshake
10-27-2010, 03:51 PM
here ya go!
tikiroom
10-27-2010, 09:28 PM
Great chart headshake!
Thanks for the post.
So it's not really that big of a deal.
One less thing to worry about! :cool:
tikiroom
10-27-2010, 09:29 PM
Oh and btw, cool pumpkin headshake. :jointsmile:
headshake
10-27-2010, 09:59 PM
Oh and btw, cool pumpkin headshake. :jointsmile:

thank you very much!

-shake
tinytoon
10-27-2010, 11:01 PM
Thank you for the correction guys. Guess that shows me that my meter is a piece of crap lol :wtf: