Metrohm 792 Basic IC User Manual
Page 158
5.2 Maintenance and servicing
792 Basic IC
149
6 Mounting the pump head
x Reassemble the components of the pump head 34
34
34
34 as shown
in Fig. 16. Tighten the screw 81
81
81
81 by hand. First screw in piston
cartridge 85
85
85
85 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 92
92
92
92 with a wrench.
x 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.
x Screw connection capillary 35
35
35
35 to pump head 34
34
34
34 (see Fig. 3).
x 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
95
95
95
95
96
96
96
96
97
97
97
97
98
98
98
98
99
99
99
99
100
100
100
100
101
101
101
101
95
95
95
95
96
96
96
96
97
97
97
97
100
100
100
100
99
99
99
99
98
98
98
98
101
101
101
101
Fig. 18: Components of inlet valve 90 and
outlet valve 91
95
95
95
95
Valve housing
96
96
96
96
Sealing ring (black)
97
97
97
97 Sleeve
98
98
98
98 Sapphire sleeve
The bright side must point towards
the sapphire sphere
99
99
99
99 Sapphire sphere
100
100
100
100 Ceramic holder for sapphire
sphere
The large recess must point in the
direction of the sapphire sphere
101
101
101
101 Seal
The larger opening must point
outwards