Re: pH Probe Cleaning

[Lobos <lobos0331 at yahoo_com>]

"I'm trying out the PH controller as well. Can someone
tell me what DI water
is?

Thanks.

Patrick Ng"

Patrick,

DI is an abbreviation for deionized water.  You can
usually find it at your local grocery store.

Lobos




> Date: Sun, 17 Mar 2002 19:19:48 -0800 (PST)
> From: Lobos <lobos0331 at yahoo_com>
> Subject: Re: pH Probe Cleaning
> 
> Gilbert wrote:
> "Does anyone know how to clean a pH electrode?  I
used
> a Q-Tip and plain
> water the last time I cleaned it.  My daily readings
> are beginning to
> drift a little from the setpoint. Having worked in
the
> biotech
> pharmaceutical business for the past decade, I
> recognize a pH probe that
> needs help.  We never cleaned 'em, just replaced
them
> with a new probe.
> I have a new probe on hand, I just want to extend
the
> life the current
> one, which has been in continuous use for about 3
> months now."
> 
> Soak the probe in pH 4 calibration solution for
10-15
> minutes, rinse very well with DI water, than soak 5
> minutes in pH 7 calibration solution, and rinse
well. 
> I find that storing the probe in probe storage
> solution (usually 4M KCl) you can extend the life of
> the probe.
> 
> Lobos


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