Positive
Pressure Systems
•
Based upon differential pressure
between sample and sheath fluid.
•
Require balanced positive pressure
via either air or nitrogen
•
Flow rate varies between 6-10 ms-1
Positive
Displacement Syringe Systems
•
1-2 ms-1 flow rate
•
Fixed volume (50 l
or 100 l)
•
Absolute number calculations possible
•
Usually fully enclosed flow cells