Two types of external pumps are offered with FTA analyzers:
peristaltic pumps provide low cost dispense for contact angle work and have disposable fluid paths, and
syringe pumps provide very high quality dispense and scalability of volume and resolution by selecting the appropriate syringe capacity (diameter).
These pumps are available in single and quad 4-pump configurations. They can be ordered in place of the standard dispenser on new instruments or retrofitted to existing instruments. For a more complete discussion, see the pdf document Comparison of External Pumps.