Back to main list. What effect does each liquid class parameter have on the dispense performance?
• The pressure affects the dispenser precision (CV%). For a given liquid increasing the pressure will improve the CVs as the drops will form in a more regular manner. Note that beyond a certain point (liquid dependent) the CVs will begin to rise again. • Altering the pressure should not affect the volume of liquid dispensed. • The viscosity constant will affect the accuracy of the system for the liquid in question across the entire range by linearly scaling all volumes. • For example, if for a given liquid with a set viscosity constant of, say 1000, requesting 500 nL gives 550 nL on average then altering the viscosity constant to 909 will scale the dispense characteristic so that requesting 500 will give 500. • The vacuum level, which is applied during aspiration, should be left constant for each liquid. • The offset is a volume which will be added to each volume request and may be used to shift the dispense characteristic up or down across the entire volume range. • The difference in
