Care and maintenance
contrAA 600
Edition 01/2014
71
7.6.3
Replacing the metering syringe
The details below apply to the samplers AS-GF (graphite tube) and AS-FD (flame). The
dosing units only differ in the size of the dosing syringe (500 or 5000 µL).
1
T-Valve
2
Dosing syringe, consisting of piston and glass cylinder
3
Attachment screw
4
Drive rod
Fig. 42
Dosing unit at AS-GF and AS-FD
1.
Switch on the contrAA 600 and start the ASpect CS software. In the window
Main
Settings
Select technique:
Graphite furnace
(AS-GF) or
Flame
(AS-FD).
2.
Use
to open the
Autosampler
window. Change to the tab
Function tests
.
3.
In the
Pipetter
area, in the list field
Volume [µL]
, use the arrow keys to set the volume
to be picked up (AS-GF: 500 µL; AS-FD 5000 µL). Increase the speed to 6-7.
4.
Press the button
[Take up]
.
The piston of the dosing syringe moves down.
5.
Unscrew the fixing screw (3 in Fig. 42).
6.
Unscrew and remove the dosing syringe (2 in Fig. 42).
7.
Screw the new dosing syringe to the valve.
8.
Carefully pull the piston down until the eyelet at the piston end is aligned with the hole in
the drive rod.
9.
Screw the piston with the attachment screw finger-tight to the drive rod.
Caution
: Excessive force can lead to material damage! Do not tighten the screw too
much.
10. In the window
Autosampler
click on the
[Initialize]
button.
The piston of the dosing unit moves back to the original position.
Clean-up after cup overflow
If during the process a wash cup has overflowed, immediately interrupt the process and
clean the device.
1.
Stop the process immediately.
2.
Take up the liquid with cellulose wadding or cloth. Wipe the surface dry.
3.
Ensure that the outlet can be drained, i.e., remove any sharp bends in the draining tube
or make sure that the draining tube does not dip into the liquid in the waste bottle.
