INSTRUCTION HANDBOOK
PD22I / PD22P
PD22IP IH EN 74-125-102 v1.04
Page 11 of 20
6.2
Tube size
Tubes must be selected according to the application and volume to be filled.
PD22 can operate with different tube dimensions chosen according to the volume to be
dispensed.
The tubes are designated by their internal diameters (i.d.) in millimetres. This value is always
used as designation for the individual tube, and this is also the value to be entered in function
2 at the MC12 master controller.
PD22 can operate with the filling nozzles, tubing and Y-connectors listed in the table below.
In order to obtain stable and good filling accuracy, the choice of tubing may be made
according to the following guidelines:
Min. Volume
recommended
Tubing
Inside diameter
Y-connector
Outside diameter
10 ml
3.0 mm i.d.
4 mm o.d.
20 ml
5.0 mm i.d.
6 mm o.d.
50 ml
6.5 mm i.d.
8 mm o.d.
85 ml
8.0 mm i.d.
10 mm o.d.
150 ml
10.0 mm i.d.
12 mm o.d.
250 ml
12.5 mm i.d.
14 mm o.d.
Fig. 6.2
Above mentioned tubes are silicone tubes and supplied by Watson-Marlow Flexicon A/S.
These can be sterilised by autoclaving, gamma radiation or ethylene oxide.
It is recommendable that the tubes are of such length that can allow placing the vessel close
to the pump head.
The tube ends must always be kept below the liquid level of the suction vessel in order to
keep the tubes from sucking air.
Avoid having tubes close to the bottom of product vessel.
