Watson-Marlow PF6 - Manual (Page 10)

INSTRUCTION HANDBOOK
PF6
PF6 IH EN 74-105-022 v1.04.doc Version: 1.04 Page 10 of 30
4.3 Choosing tubes, y-connectors and filling nozzles
The filling is carried out by the PF6 which is controlled via the keypad.
The capacity is based on the volume to be dispensed, however a lot of factors can influence on the
obtainable capacity; e.g. choice of tubes and type of product.
These aspects must be considered before choosing the filling settings.
Tubes must be selected according to the application and volume to be filled. Use the table shown
below for choice of tubes according to minimum volume to be filled.
PF6 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.
In order to obtain stable and good results, the choice of tubing can be made according to the following
guidelines:
Volume
ml
Nozzle
mm i.d.
Tubing
mm i.d.
Y-Connector
i.d.
< 0.50 0.6 0.5 1.2
0.50 – 1.00 1.0 0.8 1.2
1.00 – 1.70 1.0 1.2 1.8
1.70 – 7.00 1.6 1.6 1.8
7.00 – 12.0 3.2 3.2 3.6
12.0 – 22.0 4.5 4.8 4.8
22.0 – 35.0 6.0 6.0 4.8
>35.0 ml 8.0* 8.0 7.5
* use non-return valve
Tubes must be cut in the right length in order to achieve optimal dispensing.
The filling time for a volume of 10.0 ml with a Ø3.2 ID tube is 0.8 seconds with dispenser running in
high speed i.e. 400 in rpm and 100 in acceleration.
The same volume can be obtained with Ø4.8 ID tube in 0.55 seconds for the same parameters.
The contrast here is outweighed by the fact that Ø3.2 ID tube will in this case yields better accuracy
than the option of using Ø4.8 ID. But as it is indicated the capacity will be higher with Ø4.8 tube since
filling time is less.
The above mentioned example should be considered as guidance only, and adjustments should be
done for the individual applications.