Quadra 4 Operator Manual
Tomtec
203
3.0 To compensate for these properties of liquids,
the aspirate and dispense steps have options to
improve performance
1. Pre-filling the head space with saturated vapors of a volatile solvent. This is achieved by
repeat aspiration and dispensing of the solvent prior to the final aspirate step. This will
prevent the dripping that will occur after aspirating a volatile solvent is aspirated due to partial
pressure exerted by the gas phase of the liquid in the head space.
2. Post-aspiration air gaps can also help minimized dripping of volatile liquids.
3. Aspirate and dispense speed options compensate for the resistance-to-flow that viscous
liquids have. Slow pipetting of a viscous liquid will improve accuracy.
4. Slow tip withdraws can compensate for liquids with high wetting properties (liquids that
tend to stick to the outside of the tip).
5. Tip-touch option can remove drops of liquids with high surface tension that cling to the end
of the tip.
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