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["Frank Bales" <frankbales@msn.com> (by way of John Dolman<info@the-dolman-consultancy.com>)]

>
Bcc: "Bales_frank_on_msn" <frankbales@msn.com>
References: <auto-000024537502@gkscomputers.com>
Subject: Re: Euipment Usage Log
Date: Thu, 4 Feb 2010 03:17:47 -0500
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Ambika,

Industry practice is to maintain usage logs for all equipment that must
=
be calibrated or otherwise maintained.=20

Yes, there must be a usage log for a pH meter and probe used in =
production. The log must record in GMP fashion what batches the =
equipment was used for. It should also record, or reference another
=
recording document, each standardization of the pH meter, including the
=
batch identification of each standardization buffer solutions used.
=
(Your SOP should guide on the pH's of the buffers used, which generally
=
state to bracket the target pH range and be no more than 2 pH units
=
apart. Your SOP should also guide on what the acceptable performance of
=
the pH probe is, which is usually the slope of the response.) The actual
=
performance of the probe during standardization, and that it passed or
=
did not, are also to be recorded in the usage log.

Regards,

Frank Bales, Ph.D.=20

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