Metrohm 828 IC Dual Suppressor - Manual (Page 42)

5 Care and maintenance
828 IC Dual Suppressor/ 8.828.1003 Instructions for Use
34
5.4.1 Replacing the CO
2
absorber cartridge
The CO
2
absorber cartridge must be replaced at regular intervals. The
replacement interval depends on the operating time of the 828 IC Dual
Suppressor and the laboratory surroundings. A color change indicates
when the absorber material is exhausted. An exhausted cartridge is
also indicated by an increased background conductivity and an
unstable baseline.
The CO
2
absorber cartridge contains alkali hydroxides. Please
observe the appropriate regulations when handling and disposing of
these chemicals.
Attaching the CO
2
absorber cartridge is described in Section 2.2.1.
• Remove the exhausted cartridge in the opposite sequence to that
described in Section 2.2.1 Point 2.
• Attach a new CO
2
absorber cartridge.
5.5 Unplanned maintenance work
If problems occur when using the 828 IC Dual Suppressor then it may
be necessary to carry out the following maintenance work. Details
about problems and their remedies are given in Section 4.1 Remedying
faults and problems.
5.5.1 Regenerating the cation exchanger
The cation exchanger in the suppressor cell may become exhausted if
the exchange capacity of the 828 IC Dual Suppressor is exceeded or if
a fault occurs during operation. The following steps should be carried
out to regenerate the cation exchanger.
1 Prepare the system
• Remove the column from the system and connect the
suppressor to the high pressure pump.
• Switch off the 828 IC Dual Suppressor at mains switch 16.
2 Regenerate the cation exchanger
1. Rinse the system with ultrapure water for 15 min (1 mL/min)
with the suppressor switched off (mains switch 16 = OFF).
2. Pump 25 mM sulfuric acid at 1 mL/min through the system for
30 min, the suppressor remains switched off (mains switch
16 = OFF).
3. Rinse the system with ultrapure water for 15 min (1 mL/min)
with the suppressor switched off (mains switch 16 = OFF).