Metrohm 781 pH/Ion Meter - Manual (Page 130)

8.3 QM support
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780/781 pH/Ion Meter, Manual
8.3 QM support
Metrohm AG can support you in your quality management (QM)
measures:
Literature
Brochures in the series "Quality management with Metrohm" provide an
overview of the topics of quality assurance and validation, help with the
documentation of your validation activities and explain the quality man-
agement system at Metrohm AG, Herisau. You can request them under
www.metrohm.com or from your local Metrohm agency.
Further information about the validation of Metrohm pH meters can be
found in Application Bulletin No. 271.
Instrument-internal validation aids
The system test of the pH/Ion Meter checks that all the relevant assem-
blies are functioning properly when the instrument is switched on. The
result can be produced directly as a system test report via the RS232
interface (see Section 5.5).
Calibration is a simple and necessary means of checking the functions
of the pH/Ion Meter and the electrodes connected to it. The determined
calibration data is checked according to certain criteria, can be as-
signed to a defined electrode identification and can be stored together
with it. When a defined calibration interval has expired the instrument
will inform you that the recalibration of the connected electrode is nec-
essary. A description of the calibration parameters for the various
modes can be found in Section 6.2.2 (pH) and Section 6.5.5 (Conc [781
only]).
You can use monitoring to have the instrument remind you automatical-
ly about tasks which are due for validation purposes or service
measures. Just as for an expired calibration interval, these messages
will also be protocolled with each output of a measured value which has
been determined since the expiry of the due date even though the nec-
essary measures have not yet been taken.
With diagnose you can subject the various assemblies of the pH/Ion
Meter to further-going tests. This can help you to localize any faults
which may occur. This function can also be integrated in your validation
measures. It is described in detail in Section 8.5.
The electrode test is a programmed sequence of various measure-
ments for checking the quality of the connected pH electrode. Sophisti-
cated assessments help with the selective localization of an appearing
problem. In Section 8.6 you will find an exact description of how to carry
out such an electrode test, a detailed interpretation of the possible test
results as well as the appropriate measures for remedying the faults
and preventing future ones.