Metrohm MVA-21 - Manual (Page 7)

Application Bulletin 403/1 e
Installation instruction for MVA-21
Swing head
Swing position 0 mm
Rinse position 0 mm
External position Not used
3.5.2. Rack
Rack name 6.2141.450
Shift rate 20 °/s
3.5.3. Rack data
Rack parameters
Beaker radius samples off mm
Beaker sensor off
Rack offset 0 °
Lift positions – Tower 1
Work position User
defined
mm
Rinse position 0 mm
Shift position 0 mm
Special position 0 mm
Lift positions – Tower 2
Work position Not available
Rinse position Not available
Shift position Not available
Special position Not available
Special beakers
Not used
3.5.4. Needle adjustment
The work position of the pipetting needle 6.1835.050 has to
be adjusted in a way that the lower end of the needle is
positioned max. 1 mm above the bottom of the sample vial.
This is essential to guarantee a complete transfer of the
sample from the sample vial on the rack of the 858
Professional Sample Processor into the measuring vessel of
the 894 Professional CVS.
Fig 9: Needle adjustment
Procedure to adjust the needle position in viva
1. Insert an empty sample vial to the desired sample
position on the rack (position 57 to 126).
2. Click on the Manual symbol.
3. Select Tower 1 (Sample changers – 858 Professional
Sample Processor).
4. Open tab «Move».
5. Enter the position of the empty sample vial in the field
«Target position».
6. Click Start to move the needle to the chosen rack
position.
7. Enter 125 mm in the field «Target position» in the
section «Lift position».
8. Click Start to lower the needle to the chosen target
position. To adjust the needle like shown above, use
the arrow up and down buttons to lower the
needle stepwise.
0.5 … 1 mm
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