Metrohm 761 SD Compact IC - Manual (Page 99)

6.2 Maintenance and servicing
761 SD Compact IC / Instructions for Use 8. 761.1043
91
6.2 Maintenance and servicing
6.2.1 General information
Care
The 761 SD Compact 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.
For protection against escaping fluids, the two drain tubes for the inner
compartment and for the bottle rack must be fitted (see Section 2.5).
Spilled chemicals and solvents should be wiped up immediately. It is
especially important to protect the plug connections at the rear of the
instrument (in particular, the mains plug) against contamination.
Even though design measures virtually eliminate such a situation,
should corrosive media penetrate the interior of the instrument, the
mains plug of the 761 SD Compact IC must be immediately discon-
nected to prevent extensive damage to the instrument electronics. In-
form Metrohm Service if your instrument(s) has or have been dam-
aged in such a way.
The instrument may not be opened by untrained personnel. Please
comply with the safety notes in Section 1.4.
Maintenance by Metrohm service
Maintenance of the 761 SD Compact IC is best done as part of an an-
nual 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 servicing department is always willing to offer expert ad-
vice on the maintenance and servicing of all Metrohm instruments.
6.2.2 Passivation
Passivation of the complete IC system (without column) by rinsing with
20...50 mL 0.2 mol/L HNO
3
is required only if unusual changes to the
measuring properties of the cell are observed. In this case, remove the
separating column 36 from the 761 SD Compact IC and connect the
two capillaries 35 and 37 (see Figure 3) directly together using a cou-
pling 54 (6.2744.040).
6.2.3 Shutdown
If the 761 SD Compact IC is shut down for a considerable length of
time, the entire IC system (without column and suppressor) must be