Sample Aspiration And Dilution Mechanisms; Dilution Pumps (Dip And Dop) - Siemens ADVIA 1800 Operator's Manual

Sample aspiration and dilution mechanisms

The sample-dilution probe (DPP) aspirates sample from the sample tray (STT), from a
laboratory automation system (LAS), or from the universal rack handler, and dispenses it
into cuvettes in the dilution tray (DTT), according to the specified assay conditions. The
dilution pumps handle the aspiration and dispensing functions.
Using these mechanisms, you dispense the following items into the DTT cuvettes:
•
sample diluted with standard diluent
•
sample diluted with special purpose diluent
•
undiluted sample

Dilution pumps (DIP and DOP)

1 Dilution Probe Aspiration Pump (DIP)
2 Dilution Probe Discharge Pump (DOP)
3 Dilution Probe Wash Pump (DCP)
Figure 1-16. Dilution pumps
The aspiration pump (DIP) withdraws sample from the sample tray or from an
automatic laboratory system (such as a rack handler or lab cell); the discharge
(DOP) pump dispenses sample into the DTT cuvettes. The DPP executes both
actions. During both actions, the dilution pump valves (DPEV1 and DPEV2) are
closed.
After the sample is aspirated, the DPP moves to the wash port, where the outside
is washed. Dilution wash-cup valve 2 (DPEV2) is open during this process. This
allows water to flow over the outside of the DPP.
After the sample is dispensed, the DPP moves back to the wash port, where the
inside is washed. Dilution probe valve 1 (DPEV1) opens, allowing the DCP to
send standard diluent (saline 0.9%) through the inside of the DPP.
After the wash, the saline solution drains down the wash port.
24 ADVIA 1800 Operator's Guide