Metrohm 790 Personal IC - Manual (Page 164)

5.2 Maintenance and servicing
790 Personal IC
155
5.2 Maintenance and servicing
5.2.1 General information
Care
The 790 Personal IC requires proper care and attention. Excessive
contamination 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 790 Personal 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 790 Personal IC is best done as part of an annual
service 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 63 63 63 63 is removed from the 790 Personal IC. The two
capillaries 20 20 20 20 and 37 37 37 37 (see Fig. 13 and Fig. 15) are directly connected to
each other using the Coupling 26 26 26 26 (6.2620.060).