Metrohm 790 Personal IC User Manual
Page 170
5.2 Maintenance and servicing
790 Personal IC
161
6 Mounting the pump head
• Reassemble the components of the pump head 34
34
34
34 as shown
in Fig. 17. Tighten the screw 84
84
84
84 by hand. First screw in piston
cartridge 88
88
88
88 manually until the stop is reached and then use
a wrench to turn it through a further
15°. Firmly tighten the two
valve screw holders 95
95
95
95 with a wrench.
• Reattach pump head 34
34
34
34 to the pump with the help of the 4
fixing screws 33
33
33
33. Firmly tighten them with the 6.2621.030 Al-
len key.
To ensure that the pump head is not positioned wrongly, the holes at
the rear for the clamping bolts have different depths, i.e. 1 clamping
bolt is longer than the rest. The deepest hole must naturally accom-
modate the longest bolt. If this is not the case, the pump will not
function properly.
• Screw connection capillary 35
35
35
35 to pump head 34
34
34
34 (see Fig. 3
and Fig. 4).
• Connect aspirating tubing to aspirating capillary 32
32
32
32 at the
pump head 34
34
34
34.
Inlet valve
Outlet valve
6.2824.090 6.2824.080
94
94
94
94
99
99
99
99
100
100
100
100
101
101
101
101
102
102
102
102
103
103
103
103
104
104
104
104
98
98
98
98
99
99
99
99
100
100
100
100
103
103
103
103
102
102
102
102
101
101
101
101
104
104
104
104
Fig. 19: Components of inlet valve
93 and
outlet valve
94
98
98
98
98 Valve housing
99
99
99
99 Sealing ring (black)
100
100
100
100 Sleeve
101
101
101
101 Sapphire sleeve
The bright side must point towards
the sapphire sphere
102
102
102
102 Sapphire sphere
103
103
103
103 Ceramic holder for sapphire
sphere
The large recess must point in the
direction of the sapphire sphere
104
104
104
104 Seal
The larger opening must point
outwards