air. A single tandem pump is usually
smaller and less expensive than two
Speed control? Pump speed may be
lowered or even increased to match system requirements, resulting in a longer
lifetime for the pump and fluidic components, as well as quieter operation.
in the wash cup, and a vacuum is pulled
through the waste needle, aspirating the
liquid waste from the well (Figure 1C).
Positioning the waste aspiration needle
on an angle may allow the exiting liquid
to swirl, resulting in better cleaning. P
and suction duration should be optimized
to assist needle drying after all liquid has
been removed. Alternatively, some systems incorporate a separate pump to blow
air over/through the needle to aid drying.
Why a diaphragm pump?
Diaphragm pumps are the most
popular choice for both wash and waste
removal functions. Reasons include:
• Ability to handle liquid/air mixtures
• Chemical compatibility
• Self-priming ability
• Ease of adjustability to accommodate a
wide and varying range of flow rates