Metrohm 940 Professional IC Vario ONE/ChS/LPG - Manual (Page 74)

5.8 Servicing the high-pressure pump
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940 Professional IC Vario ONE/ChS/LPG (2.940.1250)
Cleaning the outlet valve
1 Removing the outlet valve
￭ Unscrew the connection capillary to the auxiliary piston from the
outlet valve holder (16-2) (1).
￭ Start by loosening the outlet valve holder with the adjustable
wrench and then unscrew it by hand (2) and remove it.
￭ Remove the outlet valve from the outlet valve holder (3).
2 Cleaning the outlet valve
￭ Start by rinsing the outlet valve in the direction of eluent flow
using a wash bottle filled with ultrapure water, RBS™ solution or
acetone. (The direction of eluent flow is marked on the valve by
an arrow.)
The rinsing solution must come out at the valve outlet.
If no more solution comes out, then the valve is blocked.
￭ Rinse the outlet valve in the direction opposite the eluent flow
using a wash bottle filled with ultrapure water, RBS™ solution or
acetone.
The rinsing solution should only come out at the valve outlet.
￭ The rinsing effect is further increased through a short treatment in
an ultrasonic bath.