Metrohm 792 Basic IC - Manual (Page 152)

5.2 Maintenance and servicing
792 Basic IC
143
5.2 Maintenance and servicing
5.2.1 General information
Care
The 792 Basic IC requires proper care and attention. Excessive conta-
mination of the instrument could possibly lead to malfunctions and a
shorter service life of the inherently rugged mechanical and electronic
parts.
Spilled chemicals and solvents should be wiped up immediately. It is
especially important to protect the plug connections at the rear of the
instrument (particular the mains plug) against contamination.
Although constructional measures have been designed to virtually
eliminate such a situation, should corrosive media penetrate the
interior of the instruments the mains plug of the 792 Basic IC must be
immediately disconnected to prevent extensive damage to the
instrument electronics. Inform Metrohm service if your instrument(s)
have been damaged in such a way.
The instrument must not be opened by untrained personnel. Please
comply with the safety notes in section 1.4.1.
Maintenance by Metrohm service
Maintenance of the 792 Basic IC is best done as part of an annual ser-
vice performed by specialists from the Metrohm company. If work is
frequently performed with caustic and corrosive chemicals, it may be
necessary to shorten the interval between servicing.
The Metrohm service department is always willing to offer expert advice
on the maintenance and servicing of all Metrohm instruments.
5.2.2 Passivation
Passivation of the complete IC System (without column) by rinsing with
20...50 mL 0.2 mol/L HNO
3
is only required when unusual alterations to
the measuring properties of the cell are observed. For passivation, the
separating column 66 66 66 66 is removed from the 792 Basic IC. The two capil-
laries 20 20 20 20 and 37 37 37 37 (see Fig. 12 and Fig. 14) are directly connected to
each other using the Coupling 26 26 26 26 (6.2620.060).