Knauer Azura V6840, Руководство пользователя

Страница: 34 / 41

P 2.1L user manual V6840, version
3. 5
Maintenance and Care 35
Next steps Mounting a pump head.
Attaching Capillaries to the Pump Head
Pay attention to the torques in the chapter Installation (see page 35).
Prerequisite The pump head has been removed.
Tool Open-end wrench, sizes 10, 17
Device defect
Damage to the pump head caused by overtightened capillary fittings. Note
the torque of the fittings.

Use 5 Nm torque for stainless-steel fittings.

Use 1 Nm torque for PEEK fittings.
Note: PEEK fittings can withstand pressures up to 400 bar for 1/16" and
200 bar for 1/8".
Check Valves
Dirty check valves do not open and close properly. They cause pressure fluc-
tuations and irregular flow. If it is impossible to clean the check valves,
replace the whole unit.
Removing the Check Valves
Prerequisite

The pump head has been purged.

The capillaries have been removed.

The pump head has been dismounted.
Procedure Process Figure
1. Slide the fitting
1
onto the cap-
illary 2 .
2. Slide the clamping ring 3 onto
the capillary, so the capillary
comes out.
Fig. 31 Screw fitting
3. Using an open-end wrench,
hold the inlet fitting
5
in place.
4. Tighten the fitting
4
at the
pump head.
5. If the capillary cannot be
screwed tight, then use a new
clamping ring!
Fig. 32 Pump head
1 2 3
4
5
Torque Pump head stainless steel Torque for inlet and outlet fitting
100 ml 15 Nm
250 ml 15 Nm
500 ml 12 Nm
1000 ml 12 Nm