Needle washing process
Both 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 Macro syringe pushes the diluent through V8 (Off), V7 (Off), V6 (On). The Pump aspirates
the diluent from the washing head through V5 (On), while the M2 Vertical motor moves the
sampling needle up.
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