Abacus
4
Service Manual
16
2.2.1. Sample rotor
The instrument has a sample rotor for safe and precise sample handling. Commonly used
sample tubes are supported by replaceable tube adapters.
The Sample rotor unit uses a stepper motor, connected to the PPB, through the XY opto board.
The rotor has micro switches for positioning.
The unit blocks itself in the home and end position with mechanical parts and has a special cap
that prevents the damage of the electronic and mechanic parts caused by any fluid.
Sample rotor is maintenance-free.
2.2.2. Sampling needle
Sampling needle is assembled in the H&V moving unit and it makes the sample aspirations.
Correct setting of sampling needle is necessary and very important (see Chapter: Adjustments).
2.2.3. Wash head
Wash head is located at the bottom of the H&V moving unit and it is for cleaning the outer
surface of the sampling needle. This washing process is made with diluent reagent and the
pump drains the fluid. The arrows on the picture show the direction of diluent flow during
sampling needle washing. The figure below shows the wash head upside down.
Clean or replace washing head yearly, or after 10 000 measurements.
ches for positioning
sealing ring
clean diluent
pump to waste
Micro switches
Replaceable tube adapter
