Metrohm 850 Professional IC Cation - LP-Gradient - Manual (Page 73)

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5 Operation and maintenance
850 Professional IC Cation – LP Gradient
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2
1
Figure 29 Removing piston
1 Pump head 2 Piston
2 Dismantling the piston
Caution
On the inside of the piston cartridge there is a taut spring than can
jump out of the piston cartridge if suddenly loosing tension.
When opening the piston cartridge, hold pressure towards the
spring and unscrew carefully.
￭ Loosen the screw of the piston cartridge with a wrench and
unscrew carefully by hand and by holding pressure towards the
taut spring.
￭ Remove the zirconium oxide piston and lay on a tissue.
￭ Remove the spring retainer, spring and the inner plastic sleeve
from the piston cartridge and lay by.
￭ Remove the backup ring from the pump head and lay to the other
parts.