Picus
®
2 Operating Instructions 35
System Settings
7.5 Adjusting the Device
The piston stroke is designed for normal conditions as standard:
— Aqueous liquids
— Normal pressure
— Device, tip and liquid at room temperature
If the conditions change: the accuracy of the dispensed volume may
change. The adjustment function can ensure that the device remains
accurate. Adjustment of the dispensed volume is required in the following
cases:
— The pipetting liquid’s properties are significantly different from those of
water, e.g. viscous or volatile liquids.
— The temperature of the device, pipetting tip and liquid deviates
significantly.
— The ambient air pressure differs from normal pressure.
The adjustment function enables the device to be set to one or more
adjustment points. The more adjustment points are selected, the greater
the accuracy over the entire volume range of the device. Sartorius
recommends the following settings:
— 1-point adjustment: pipetting a constant volume within a range
— 2-point or 3-point adjustment: pipetting volumes within the entire range
When adjusting the accuracy, the actual volumes obtained should be
measured in pipetting mode. After adjustment has been carried out, it will
be applied to all modes and a symbol for adjustment will be displayed.
Procedure
t If password protection is activated: log in with the admin password.
t Open the main menu.
t Open the “Settings” sub-menu.
t Open the “Adjustment” menu option.
t Select the parameter under which the adjustment settings should be
saved, e.g. Empty Slot 1.
t Activate edit mode.
t Set a name.
t Select the number of adjustment points.
t Confirm the selection.
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