Info On pH Probes

R

Thread Starter

Richard King

Hi all,
I have a installation that requires a pH probe to be dry for 6 months of the year. I have been told a gel cell pH probe can withstand exposure to the air for long periods of time (Takes about 15min to
stabilise after wetting). Anyone know if this is an acceptable practice? Or another solution? (There is no water available at the site)

Regards,
Richard

Alesa Alusuisse Engineering Australia Pty Limited.
Phone: +61 7 3218 3555
Fax : +61 7 3236 0155
Email: [email protected]
Web : http://www.alesa.com.au
 
S
Richard,

From my experience with pH probes I would recommend that you have a cap that you could put over the bulb end of the probe for that 6 months of dry time. Fill the cap with 7.0 buffer and then secure the cap to the probe with some tape. Just something I learned from my own experiences.

Sid Roberts

[email protected]
 
S
Richard,
I cut-and-pasted this from the adobe acrobat document entitled "Theory and
Practise of pH Measurement". The complete document can be downloaded from the
vendor website at www.rauniloc.com under the link 'white papers'.

7.4 STORING pH SENSORS.
Out of service pH sensors should be stored wet. pH 4 buffer to which a small
amount of potassium chloride has
been added is the best storage solution. Do not store sensors in deionized water
or alkaline buffers. If a sensor
dries out during storage, soaking it overnight in pH 4 buffer will usually restore
the hydrated glass layer and the reference
junction.

Cheers,
Stan

>
> Hi all,
> I have a installation that requires a pH probe to be dry for 6 months
> of the year...
 
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