Siemens ADVIA 1800, Operator'S Manual, Page: 32 / 222

32 ADVIA 1800 Operator’s Guide
Reaction tray wash mechanisms
The reaction washer (WUD) washes reaction tray (RRV) cuvettes after sample analysis is
complete. This allows the reuse of cuvettes without the risk of contaminating the next
sample.
The WUD has seven nozzles. Each nozzle performs a stage of the wash. Each nozzle
works on a different cuvette, so the WUD washes seven cuvettes simultaneously (the
cuvettes are washed in different stages at the same time).
After a cuvette is washed by one nozzle, it moves to the next until washing is complete.
While the RRV rotates, the WUD is in the up position.
The wash liquids pass through a preheater before they reach the WUD.
Figure 1-23. Reaction tray wash mechanisms
Reaction washer operation
At initialization, the WUD moves to the up position. If it is already up, it is lowered, then
raised.
To advance the cuvettes to the next wash nozzle, the RRV rotates a half-turn.
Exception
: After washing by nozzle 4, the tray makes 10 half-turns to move the cuvette
with cell conditioner to nozzle 5 position. This is because 12 cuvette positions separate
nozzles 4 and 5. During these additional half-turns, two cell blank measurements are
performed.