Metrohm 940 Professional IC Vario ONE/ChS/HPG - Manual (Page 75)

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5 Operation and maintenance
940 Professional IC Vario ONE/ChS/HPG (2.940.1240)
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￭ Has the pressure dissipated?
￭ Is the instrument switched off?
1 Release the coupling from the pressure screw and seal it with a stop-
per.
2 Unscrew and remove the pressure screw on the pump head's output
(15-8).
3 Unscrew and remove the four fastening screws (15-3) using the hex
key.
4 Remove the pump head (15-4).
Replacing the piston seal
Carry out the following work on both pistons in turn.
Servicing a piston consists of the following tasks:
1. Replace the piston seal.
2. Optional: Clean or replace the zirconium oxide piston.
3. Reinstall the piston.