Metrohm 940 Professional IC Vario ONE/SeS/PP/HPG - Manual (Page 97)

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5 Operation and maintenance
940 Professional IC Vario ONE/SeS/PP/HPG (2.940.1540)
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5.10 Servicing the pulsation absorber
CAUTION
The pulsation absorber is maintenance-free and must not be opened.
5.11 Injection valve
Maintenance on the injection valve is best performed by specialist person-
nel from Metrohm during annual service.
5.12 Suppressor
5.12.1 Notes for operating the suppressor
To protect the suppressor against foreign particles or bacterial growth, a
pump tubing connection with 6.2744.180 filter (see "Installing the pump
tubing", page 41) must be mounted between the peristaltic pump (see
Chapter 3.14.2, page 44) and the inlet capillaries of the suppressor.
NOTE
The suppressor units must never be regenerated in the same flow direc-
tion the eluent is pumped. Therefore, always mount the input and out-
put capillaries according to the diagram outlined in Chapter Connecting
the suppressor, page 34.
The suppressor consists of three suppressor units, which are used in rota-
tion for suppression, regenerated with regeneration solution, and rinsed
with ultrapure water. In order to record every new chromatogram under
comparable conditions, you should normally work with a freshly regener-
ated suppressor.
CAUTION
The suppressor must never be switched over if liquid is not flowing
through it, since otherwise it may become jammed. If the suppressor is
in a dry state, it must be rinsed for at least five minutes before it may be
switched over.