Smartline Autosampler 3900 Manual / Handbuch V 1508 03/2007

Maintenance 55
Syringe
• Check the needle penetration depth, see below and adjust if
necessary.
• Perform a wash routine to clean the new needle by pressing
Air needle replacement
To replace the air needle proceed as follows (see Fig. 44):
• Remove sample needle as described.
• Remove air needle (10) and install new air needle.
• Reinstall sample needle as described.
Sample needle penetration depth
To keep rest volume small, the sample needle should stop close to the
bottom of the sample vial. If the needle penetration depth needs
adjustment, proceed as follows (see Fig. 45):
• Open keyboard cover.
• Place an uncapped sample vial in position 2 of the tray.
• Lower the sample needle in the vial, therefore:
Program a method with a full loop injection and an analysis time of
at least 10 seconds.
Program a Series with the programmed method and vial 2 as first
and last vial.
Start the Series.
As soon as the sample needle has entered the vial, switch of the
power supply.
• Loosen adjustment screw one turn (counter clockwise).
• Use the needle connection nut (4) as a grip, adjust needle
penetration depth.
Needle should stop not less than 1 mm above the bottom of a
standard vial and not less than 2 mm above the bottom of a conical
vial.
• Fasten adjustment screw (clockwise).
• Re-apply the power, the AS 3900 will initialize and is ready for use.
The AS 3900 is factory equipped with a 250 µl syringe, but can also be
equipped with a 1000 µl syringe.
To install another syringe proceed as follows:
Do not disconnect the power supply of the AS 3900, it is needed to
move the syringe!