Metrohm 781 pH/Ion Meter - Manual (Page 131)

8 Troubleshooting – Messages – Maintenance
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Service contract
Under a separate service contract you can receive particular service
performances within the framework of preventative maintenance. The
documented specifications of the instrument will be checking by the
service technician responsible at regular intervals; the technician will
document the results and suggest any measures which may be neces-
sary.
Certificates for Metrosensors and electrolytes
The validation of the pH/Ion Meter should always include the validation
of the whole measuring system (instrument, electrodes, electrolytes
and, if applicable, the stirrer). All Metrosensor pH electrodes, ion-
selective electrodes, reference electrodes and temperature sensors are
supplied with the corresponding certificates. The same applies for buff-
er solutions, which are supplied with batch-specific certificates.