Metrohm 844 UV/VIS Compact IC - Manual (Page 96)

Table of contents
Figure 27: Replacement of the piston seal 140
27/
54
Pump head 6.2824.040/6.2824.100
133 Screw (3.709.1100) for piston
cartridge 137.
134 Zirconium piston (6.2824.070) with
piston shaft
135 Spring retainer
136 Spring (6.2824.050) for main piston
or
Spring (6.2824.060) for auxiliary
piston
137 Piston cartridge (4.709.0760)
138 Piston guide sleeve (4.709.4380)
139 Piston guide sleeve (4.709.4370)
140 Piston seal (6.2741.020)
141 Inlet valve 6.2824.020/6.2824.090
142 Outlet valve 6.2824.010/6.2824.080
143 Screw holder for valve
144 Special tool (6.2617.010) to remove
the piston seal 140
145 Special tool (6.2617.010) to install
the piston seal 144
The seal surface in the pump head 27/54 must not be damaged
(avoid contact with tool)!
5 Cleaning/replacement of inlet valve 141 and outlet
valve 142
• Contaminated or blocked valves are cleaned by rinsing with
dist. water, RBS solution or acetone. The rinsing effect can be
reinforced by brief treatment in an ultrasonic bath (max. 20 s;
if longer the sapphire sphere of the valve can be damaged).
• If this does not have the desired effect, the valves can be
disassembled as shown in Figure 28. The valve components
are pushed out with the aid of a syringe needle inserted
A
C
144
145 140
27/54
144
145
140