System Overview 25
Sample pumps
Figure 1-17. Sample pumps
1 Sampling Pump (SP)
2 Sampling and Reagent Wash
Pump (SRWP)
The sampling pump (SP) aspirates and dispenses samples through the SPP. The solenoid
valves SPEV1 and SPEV2 facilitate sampling.
After the sample is aspirated, the SPP moves to the wash port, where it’s outside is
washed. Solenoid valve (SPEV2) is open during this process, allowing water through the
outside of the SPP.
After the sample is dispensed, the SPP moves back to the wash port, where its inside is
washed. Solenoid valve (SPEV1) opens, allowing the SRWP to send degassed water
through the SPP’s inside.
After the wash, the water drains down the wash port.
Sample dilution
Dilution tray operation
At the time of system initialization, the tray rotates clockwise until DTT cuvette 1 is in the
aspiration position.
During sampling, the DTT rotates clockwise or counterclockwise, depending on which
rotation is smaller. For each sample, it performs these actions in a 3-second cycle:
• Moves cuvette to mixer position (after sample is dispensed into DTT cuvette).
• Moves cuvette to aspiration position (after sample is mixed).
Samples remain in cuvettes until all samples are processed and analysis data is
collected. This allows for reassay.
• Moves cuvette to dispense position (after assay is complete and cuvette is washed).
Exception: If a sample requires special purpose diluent, the DTT cuvette remains at the
dispense position for two dispense cycles (by the DPP).
The cycle repeats until all samples are processed. During each cycle, unused cuvettes are
washed.
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