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6 Operation and maintenance
930 Compact IC Flex Oven/SeS/PP (2.930.2500)
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61
6.1.4 Shutting down and recommissioning
If the instrument is no longer used for a prolonged period, remove the
guard column and the separation column. Rinse the IC system until it is
salt-free with a mixture of methanol and ultrapure water (1:4). This pre-
vents eluent salts from crystallizing and then causing damage.
Rinsing the IC system to be free of salts
1
In the software, stop the hardware and wait until the pressure in the
high-pressure pump has been released.
2
Remove the guard column and the separation column from the elu-
ent path. Connect the connection capillaries directly with each other
using a coupling (6.2744.040).
3
Rinse the IC system for 15 minutes with methanol/ultrapure water
mixture (1:4).
4
Optional: Only if the IC system is equipped with a suppressor.
In the software, switch the Metrohm Suppressor Module (MSM) 2
times during the rinsing process at 5-minute intervals in each case
(STEP command).
5
Optional: Only if the IC system is equipped with a suppressor and a
peristaltic pump.
Rinse the pump tubings used for the peristaltic pump with water for
15 minutes at level 1. Finish by releasing the contact pressure at the
peristaltic pump. Finish by releasing the contact pressure at the peri-
staltic pump.
Putting the IC system back into operation
1
Check that a coupling (6.2744.040) is installed in place of the guard
column and the separation column.
2
Rinse the IC system with freshly prepared eluent for 15 minutes.
3
Remove the coupling and install the guard column and the separa-
tion column (see Chapter 4.19, page 52 and Chapter 4.20, page 54).
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