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do the digital ph pens need to be stored with water in the cap
- Thread starter budman678
- Start date
InMigraineHell
New member
Yup they do.
No you should use storage solution or a acidic solution of 4-5
My Milwaukee says to use 7.0 storage solution.
my blue lab uses 4.5.......I have 3 different storage solutions there all between 4-5 PH..
Here is some data to read
http://www.coleparmer.com/techinfo/techinfo.asp?htmlfile=BG-1189_StoreElectrodes.html&ID=1189
http://www.coleparmer.com/techinfo/techinfo.asp?htmlfile=BG-1189_StoreElectrodes.html&ID=1189
I use this.
I have that same one in the pic... The PH is 4-5 closer to 4.....
C
cyber echo
Use storage fluid.
IF you want your pH meter to stay working after a few months
Ph buffer 7.0 is fine for a while but that will not clean your electrode which means decreased electrode life down the road.
IF you want your pH meter to stay working after a few months
Ph buffer 7.0 is fine for a while but that will not clean your electrode which means decreased electrode life down the road.
I stored my PH pens for two months with PH 7 water and my meter was off by .4. The bottle only cost I think about $7. It's a lot cheaper than growing new plants or waiting for them to recover after you damage them.
Any water other than distilled will cause build up on the probes. That can't be good.
HempAlchemist
Member
pH probes should be kept moist. there is 'storage' solution for this which is the best. then distilled water, then 7.0 calibration solution. this what my local shop has told me. like freezerboy said, any other water beside distilled will shorten the life of the probe
??? I think you have it backwards
avoid storing in distilled water because it will deplete the hydration layer of refillable electrodes, and decrease the life of nonrefillable electrodes.
HempAlchemist
Member
im repeating info giving to me by the guy that sold me my pH pen. his logic for distilled water was basicly the same as freezerboy in that if for some reason the liquid evaporated off, there wouldnt be any salt build-up on the electrode causing a shortened life. he had said that 7.0 calibration solution would have very low salt content compared to an acidic or basic calibration solution and a lot less dangerous to handle if you spilled on yourself, clothes, etc. im not saying i wasnt misinformed, but after using my pH pen for almost 2 years with no real issues other than needing to adjust the calibration here and there, i just have no reason atm to believe otherwise. this is however the first ive heard about the hydration layer issue so i will need to question him about that next time im in the store.
walt cunningham
Member
i keep mine in the storage solution, but when you buy them new, they are not in any solution, and i'm sure some sit on the shelves for over 6 months
My Blue lab did have storage solution on the probe when I bought it..This is a good read if you did not see this post
http://www.coleparmer.com/techinfo/techinfo.asp?htmlfile=BG-1189_StoreElectrodes.html&ID=1189
This is how the blue lab comes the cap is filled with something. I did not check what the PH was before I dumped it out.
http://www.coleparmer.com/techinfo/techinfo.asp?htmlfile=BG-1189_StoreElectrodes.html&ID=1189
This is how the blue lab comes the cap is filled with something. I did not check what the PH was before I dumped it out.
touringfunkband
Active member
Actually Qupee, the instructions I have for the Oakton pH2 say..
"For long-term storage, fill the cap with 20 mm of storage solution (NOT de-ionized water), and replace cap*. This will keep the sensor conditioned and ready for next use."
When not in use, the glass probe tip must be kept wet at all times to avoid the pH sensing membrane dehydration and the subsequent dysfunction of the electrode.
A glass electrode alone (i.e., without combined reference electrode) is typically stored immersed in an acidic solution of around pH 3.0. In an emergency, acidified tap water can be used, but distilled or deionised water must never be used for longer-term probe storage as the relatively ionless water "sucks" ions out of the probe membrane through diffusion, which degrades it.
A glass electrode alone (i.e., without combined reference electrode) is typically stored immersed in an acidic solution of around pH 3.0. In an emergency, acidified tap water can be used, but distilled or deionised water must never be used for longer-term probe storage as the relatively ionless water "sucks" ions out of the probe membrane through diffusion, which degrades it.
