System Overview 31
Dilution tray mixer
The dilution tray (DTT) mixer (DMIX) stirs the contents of DTT cuvettes brought to the
mixer position. Mixing is performed using a reciprocating rod.
1) Dilution Mixer (DMIX)
Figure 1-23. Dilution tray mixer
Dilution tray mixer operation
At the time of system initialization, the mixer moves to the mixer position, then goes to
the down position. If it is already at the mixer position, it is raised, then lowered.
During each 2-second cycle on the DTT:
• The mixer moves up and over to the wash port, where it is washed with deionized
water. During this period, the dilution mixer wash valve (DMEV) is open, and
(briefly) the mixer rod is on.
• The mixer is raised and moved to the mixer position, where it is lowered into the
DTT cuvette. The rod is turned on to mix the sample.
• The mixer is raised from the cuvette and moved back to the wash port. The next
cycle begins.
If an assay is not running, you can operate the unit manually at the Manual Operation
window.
Dilution tray wash mechanisms
The dilution washer (DWUD) washes dilution tray (DTT) cuvettes after sample analysis
is complete, so they can be reused without risk of contaminating the next sample.
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