Metrohm 2.850.2230, Руководство пользователя, Страница: 92 / 150

5.5 High pressure pump
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850 Professional IC–Anion – MSM-HC – MCS – LP Gradient
Cleaning/replacing the zirconium oxide piston
Clean one piston after the other as follows:
1 Removing the piston cartridge from the pump head
Loosen the piston cartridge with a wrench and unscrew from the
pump head by hand.
2
1
Figure 40 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.
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Loosen the screw of the piston cartridge with a wrench and
unscrew carefully by hand and by holding pressure towards the
taut spring.
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Remove the zirconium oxide piston and lay on a tissue.
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Remove the spring retainer, spring and the inner plastic sleeve
from the piston cartridge and lay by.