Care and maintenance
72
Edition 01/2014
contrAA 600
7.7
Automatic samplers AS-F, AS-FD
Contamination on the tray and the casing can be removed with a dry cloth on a daily basis
as required. In addition according to conditions:
Washing the sample paths
Wash the mixing cup
Replace the canula(s) at the autosampler arm
Replace the aspiration tube and dosing tube
Replace the dosage syringe, as for AS-GF (
→
Section "Replacing the metering sy-
Clean, after a wash or mixing cup has overflowed
7.7.1
Washing the mixing cup of the AS-FD
The mixing cup must be washed before and after the operation to prevent adhesion and
scaling. Before preparing the first standard / first sample the mixing cup is washed automati-
cally. Further washing processes might be useful during continuous operation.
Washing the mixing cup prior to and after the measurement
1.
In ASpect CS open the window
Autosampler
with
.
2.
In the tab
Techn. parameters
enter a volume of 25 mL in the group
Wash mix cup
.
3.
Use the
[Start]
button to start the wash cycle.
4.
The wash cycle can be repeated several times if required.
25 mL of washing liquid is dispensed from the storage bottle into the mixing cup and auto-
matically drained off afterwards.
Washing the system prior to an extended period of decommissioning
If salts were added to the diluent (bidistilled or acidic bidistilled water), the dosing unit and
valve must be washed with methanol or ethanol prior to extended periods of decommission-
ing. Otherwise scaling and blocking may also occur.
1.
Fill the storage bottle for the diluent with methanol or ethanol.
2.
Perform the wash cycle as described in Section "Washing the system prior to and after
the measurement". Repeat the washing process several times.
7.7.2
Replacing the canulas and guide on the autosampler arm
The canulas and guide must be replaced if there is a significant contamination or mechanical
damage (detectable by large standard deviations in the measurements).
1.
Pull off the hoses from the canulas.
2.
Loosen the fixing screw on the autosampler arm.
3.
Pull the canula guide with canulas upwards and out.
4.
Fit the guide with the new canulas into the autosampler arm and fix in place with the
locking screw.
