4.1.2. Needle washing process
The instruments clean the sampling needle with diluent in the washing head after sampling.
It is important to clean the outer surface of the sampling needle to avoid inaccurate
sampling.
The Macro syringe doses and the pump drains the diluent from the washing head, while the
sampling needle moves upwards so that the total length of it is washed and cleaned. This
process is called total sampling needle washing, and it is mainly used after taking primary
sample from sample tube.
Another process, which is washing only a smaller part of the sampling needle, is the same
but the needle does not move in the total length. Some procedures perform this kind of
sampling needle washing.
The M3 Macro syringe pushes the diluent through V11 (Off), V12 (On). The Pump aspirates
the diluent from the washing head through V4 (On), while the M2 Vertical motor moves the
sampling needle up.
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