Metrohm 790 Personal IC User Manual

Page 54

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2.9 Putting into operation

790 Personal IC

45

3 Start system

• Make sure, that the aspirating tubing 6.1834.010 for the high-

pressure pump is immersed in the eluent.

• Select

Startup determination

from the

Control

menu in the sys-

tem window. The high-pressure pump and the peristaltic

pump are started, at the same time, a chromatogram window

is opened where the baseline is recorded continuously. The

suppressor module is automatically switched to the next

position every 20 min and conditioned in this way.

4 Set contact pressure for pump tubings

• Press contact pressure lever 41

41

41

41 on both tubing cartridges 40

40

40

40

upwards until regeneration and rinsing solution just start to be

drawn in.

• Then press contact pressure lever 41

41

41

41 upwards until it clicks

once more to obtain optimal contact pressure.

5 Check for leaks

• Check all capillaries and their connections between the high-

pressure pump and the detector block for escaping liquid. If

eluent escapes anywhere, the appropriate compression fit-

ting must be tightened further or changed.

6 Condition system

• Rinse the system with eluent until the desired stability of the

baseline is reached (normally 30…60 min; if the eluent is

changed, the establishment of the ion exchanger equilibrium

on the separating column can take longer). After this time the

suppressor module is sufficiently conditioned too.

• The instrument is now ready for sample determinations using

the selected system.


Pump tubings are consumable material with a lifetime, which depends

on the contact pressure. This is why the tubing cartridges should be

raised completely by loosening snap-action lever on the right-hand

side if the pump is to remain switched off for a considerable length of

time (the set contact pressure remains unchanged).

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