Nordson ValveMate 7197PCP-2K - Page 55

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ValveMate 7197PCP-2K Controller
Appendix B, Example Volume Program (continued)
Install the Mixer and Test the Process
Now that the Correction Factors have been determined, install the static mixer. Nordson EFD recommends filling
the mixer with the pumps inverted (upside down) to fully remove any trapped air in the static mixer. Ensure that the
mixer is filled with the intended ratio. The target volume per dispense in this application based on the weight will be
0.1 mL for part A and 0.03 mL for part B, which also observes the required ratio 10:3.
This application has a minimum process time of:
t (min)
=
= 0.08 min (or 5 s)
Dispense Volume
RPM × rotor / stator size
0.1 mL
120 rev/min × 0.01 mL/rev
=
If a faster process time is needed, you can increase the size of the pump for part A. The next pump size up is
0.05 mL/rev. With this pump size, achieving the same volume will require only 2 revolutions of the rotor / stator.
This would change the pump RPM ratio to 2:3, but the volume ratio will stay the same. With this new ratio, you
can increase the RPM for Part B to a maximum of 150, and you can increase the RPM for Part A to 100. The new
minimum process time will be:
t (min)
=
= 0.02 min (or 1.2 s)
Dispense Volume
RPM × rotor / stator size
0.1 mL
100 rev/min × 0.05 mL/rev
=