Metrohm 940 Professional IC Vario ONE/ChS/LPG User Manual
Page 78
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5.8 Servicing the high-pressure pump
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70
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940 Professional IC Vario ONE/ChS/LPG (2.940.1250)
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Has the pressure dissipated?
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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
3 Unscrew and remove the four fastening screws (16-3) using the hex
key.
4 Remove the pump head (16-4).
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.
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