Metrohm 930 Compact IC Flex Oven/SeS/Deg User Manual download pdf (Page 80)

5.8 Servicing the high-pressure pump

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930 Compact IC Flex Oven/SeS/Deg (2.930.2460)

Figure 21 Components of the piston cartridge

Piston cartridge screw

Retaining washer

Zirconium oxide piston (6.2824.070)

Spring retainer

Spring (6.2824.060)

Inner plastic sleeve

Protects from metallic abrasion.

Piston cartridge

Backup ring

Cleaning the parts of the piston cartridge

￭ If the zirconium oxide piston has become contaminated due to

abrasion or deposits, then clean it using a fine abrasive cleaning

powder, rinse it using ultrapure water until it is free of particles

and dry it.

The zirconium oxide piston has to be replaced if it is heavily conta-

minated or scratched.

￭ Rinse the other parts of the piston and dry with a lint-free cloth.

Putting the piston cartridge together

￭ Insert the inner plastic sleeve, the spring and the spring retainer

into the piston cartridge.

￭ Slide the zirconium oxide piston carefully into the piston cartridge

until its tip emerges from the small opening of the piston car-

tridge.

￭ Attach the screw and tighten it by hand.

Reinserting the piston cartridge

Screw the assembled piston cartridge back into the pump head and

tighten, first by hand, then also using an adjustable wrench by

approx. 15°.

Clean the second piston cartridge in the same way.

Mounting the pump head

Accessories

For this step you need the following accessories:

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Metrohm 930 Compact IC Flex Oven/SeS/Deg User Manual Page 80