Metrohm 851 Titrando - Manual (Page 52)

5.3 Quality Management and qualification with Metrohm
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851 Titrando
5.2.2.2 Cleaning
As a rule, the electrolyte solution can be exchanged without special clean-
ing of the parts. If cleaning is necessary anyway, ensure that the Pt grid of
the generator electrode is not damaged.
￭ Resinous residues on the diaphragm
Hang the generator electrode vertically on a support rod, fill with con-
centrated HNO
3
and leave overnight. First rinse with water, then with
ethanol.
￭ Contaminations containing oil
First clean with a solvent (e.g. hexane), then rinse with ethanol.
￭ Saline depositions
First clean with water, then rinse with ethanol.
￭ Cleaning (rinsing) the diaphragm
Fill the cathode chamber of the generator electrode with methanol and
let the contents flow out. Repeat this procedure two or three times.
This procedure should also be carried out after the cleaning described
above.
Thoroughly dry all parts after cleaning. A hair dryer can be used for this. If
the parts are dried in the drying oven the temperature must not exceed
70 °C (plastic parts!).
5.3 Quality Management and qualification with
Metrohm
Quality management
Metrohm offers you comprehensive support in implementing quality man-
agement measures for instruments and software. Further information on
this can be found in the brochure "Metrohm Quality Management"
available from your local Metrohm representative.
Qualification
Please contact your local Metrohm representative for support in qualifica-
tion of instruments and software. The Installation Qualification (IQ)
and Operational Qualification (OQ) are offered by Metrohm represen-
tatives as a service. They are carried out by trained employees using stan-
dardized qualification documents and in accordance with the currently
applicable requirements of the regulated industry. Further information on
this can be found in the brochure "Analytical Instrument Qualifica-
tion – Confidence in quality with IQ/OQ".
Maintenance
The electronic and mechanical functional groups of Metrohm instruments
can and should be checked by specialist personnel from Metrohm as part
of a regular preventive maintenance schedule. Please ask your local