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Old 01-29-2013, 02:35 PM   #1
Wheelspin
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Aug 2012
Johannesburg, South Africa
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I've just purchased a Hanna PH meter.

In the instructions it says (see pic blow) "To activate, immerse in storage solution for 2 hours."

Does this mean that every time I use it (say once a week) I have to activate it it first for 2 hours then only calibrate ?

Or is this just a first time use thing ?

Any comments appreciated.
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Old 01-29-2013, 03:04 PM   #2
Vigo_Carpathian
 
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Dec 2012
San Mateo, California
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Most pH probes should be stored in a 1M potassium hydroxide solution when not in use. This is not critical though. I just leave mine in buffer all the time when not in use and the probes can last a couple years this way. Storing it in buffer "can" decrease the life of the probe somewhat as well as slow the response time. (I do it anyway though with no ill effects) if your slope gets below 55, then its time to get a new probe. The gel on the interior of the probe is potassium hydroxide which can be leached out over time if not "recharged". For long term storage, I would definitely go with the Storage solution though. Hope this helps.

 
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Old 01-29-2013, 10:42 PM   #3
day_trippr
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May 2011
Stow, MA
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Quote:
Originally Posted by Wheelspin View Post
[...]Does this mean that every time I use it (say once a week) I have to activate it it first for 2 hours then only calibrate ?

Or is this just a first time use thing ?
I have the Hanna 98128, and that procedure is a one-time thing. After that you put a few drops of storage solution in the round well inside the cap when you're not using the meter...

Cheers!

 
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Old 01-30-2013, 07:11 AM   #4
Wheelspin
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Aug 2012
Johannesburg, South Africa
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Thanks guys

 
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