Specialty Chemistry Forums > Citizen Chemist
Pen pH meter care before storage.
xchcui:
Hi.
Due to lack of explanation on google about how this specific type of ph meter works(i mean scientific explanation)and poor manual.
I have some question about this pen ph meter type.
First of all,Is the part that marks with red arrow in the attached photo refer to the reference electrode?
2)Does this type of ph meter also leak electrolyte(or something)into the tested solution during its operation?
3)Regard to the manual(second photo)"OPERATION"part 6-7 sections it says"after finished,clear with D/W and replace the cap".I understand that after i finish to make measurementand before i put it in storage,i need to stir/clean the electrode bulb in distilled water solution and replace the protective cap.But do i need to dry the glass electrode from distilled water residue with tissue(or something)before i replace the protective cap or after i stir/clean the glass electrode in distilled water solution i just replace the cap without touching or drying the electrode?
Thanks.
Borek:
--- Quote from: xchcui on November 26, 2019, 09:25:38 AM ---Due to lack of explanation on google about how this specific type of ph meter works
--- End quote ---
In general - exactly the same way every other pH meter does. Many details at http://www.ph-meter.info
--- Quote ---First of all,Is the part that marks with red arrow in the attached photo refer to the reference electrode?
--- End quote ---
Reference electrode is somewhere behind the junction, that's for sure, but where it is - no idea. Somewhere inside.
--- Quote ---Does this type of ph meter also leak electrolyte(or something)into the tested solution during its operation?
--- End quote ---
A bit. Typical amounts are way too low to matter, unless you are dealing with some very specific, high purity solutions. But then, you shouldn't use a cheap pen pH meter.
--- Quote ---Regard to the manual(second photo)"OPERATION"part 6-7 sections it says"after finished,clear with D/W and replace the cap".I understand that after i finish to make measurementand before i put it in storage,i need to stir/clean the electrode bulb in distilled water solution and replace the protective cap.But do i need to dry the glass electrode from distilled water residue with tissue(or something)before i replace the protective cap or after i stir/clean the glass electrode in distilled water solution i just replace the cap without touching or drying the electrode?
--- End quote ---
Don't dry the electrode. Actually leaving a bit of excess water should be a good idea.
xchcui:
--- Quote from: Borek on November 26, 2019, 10:34:47 AM ---
Reference electrode is somewhere behind the junction, that's for sure, but where it is - no idea. Somewhere inside.
--- End quote ---
So,what is this round small part?
--- Quote from: Borek on November 26, 2019, 10:34:47 AM ---Don't dry the electrode. Actually leaving a bit of excess water should be a good idea.
--- End quote ---
This is the reason why i thought that this ph meter operate in different way.In the manual(not at the one i attached)it says clearly to dry the electrode before replace the cap and it doesn't say anything about store the electrode in storage solution or wet.This instruction was strange,since i read that the glass electrode must be hydrated,while dry electrode won't operate correctly,so i thought it operate in different way(new technology).May you have any idea why it says to dry it?
Borek:
--- Quote from: xchcui on November 26, 2019, 12:54:17 PM ---So,what is this round small part?
--- End quote ---
Junction - wick or a glass frit.
--- Quote ---This is the reason why i thought that this ph meter operate in different way.In the manual(not at the one i attached)it says clearly to dry the electrode before replace the cap and it doesn't say anything about store the electrode in storage solution or wet.This instruction was strange,since i read that the glass electrode must be hydrated,while dry electrode won't operate correctly,so i thought it operate in different way(new technology).
--- End quote ---
The only other technology I am aware of are ISFET electrodes. I can be wrong but last time I checked they were far from being cheap and popular.
--- Quote ---May you have any idea why it says to dry it?
--- End quote ---
No.
xchcui:
I attached(below)a dismantled pocket ph meter.Can it help in something to answer my questions?
Also,shouldn't the reference electrode that can be seen in the photo,as only a wire,should be cover with a casing and electrolyte?it looks different from ordinary ph meter.
Navigation
[0] Message Index
[#] Next page
Go to full version