Metrohm 861 Advanced Compact IC - Manual (Page 79)

4.2 Maintenance and servicing
861 Advanced Compact IC / Instructions for Use 8.861.1033
69
Operation
The suppressor module «MSM II» comprises a total of 3 suppressor
units which are in turn used for suppression, regenerated with sulfuric
acid and rinsed with water. To record every new chromatogram under
comparable conditions, work is normally carried out with freshly regen-
erated suppressor. Switching takes place automatically together with
the valve switching.
Suppressor units must never be regenerated with H
2
SO
4
in the same
flow direction in which the eluent was pumped. This is why you should
always connect the inlet and outlet capillaries according to the ar-
rangement shown in Figure 18 in Section 2.8.4.
Suppressor module «MSM II» must never be switched to the next posi-
tion in a dry condition as this could cause a blockage. Each time be-
fore the suppressor module «MSM II» is switched on one further step
the three suppressor units must be rinsed for at least 30 min with elu-
ent, regenerating and rinsing solutions.
Maintenance
In the event of reduced capacity or high counter-pressure the suppres-
sor module «MSM II» must be regenerated (Section 4.2.7), cleaned
(Section 4.2.8) or exchanged (Section 4.2.9).
4.1.6 Connections
All connections between injection valve, column and detector must be
as short as possible, have a low dead volume and be absolutely tight.
The PEEK capillary after the detector block must be free from constric-
tion (the measuring cell is tested to 5 MPa = 50 bar back pressure).
Use PEEK capillaries with 0.25 mm i.d. for the capillary connection be-
tween injection valve 28 and detector block 45.
4.2 Maintenance and servicing
4.2.1 General information
Care
The 861 Advanced Compact IC requires proper care and attention.
Excessive contamination of the instrument could possibly lead to mal-
functions and a shorter service life of the inherently rugged mechanical
and electronic parts.
For protection against escaping liquids the two drain tubes for the inner
compartment (Section 2.3.3) and for the bottle rack (Section 2.3.4) must
be mounted.
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.