Metrohm 748 DH Sample Changer - Manual (Page 6)

1.2 Overview
748 DH Sample Changer
4
1.2 Sample arm positions
The sample arm is moved in both the XY-direction (rack positions) as
well as in the Z-direction.
1.2.1 Positions in the XY-direction
Left-hand rack Right-hand rack
1 Wash Soak Home
The sample arm is moved so that it only moves above samples which
have already been titrated (i.e. positions which have already been vis-
ited).
1.2.2 Positions in the Z-direction
The positions in the Z-direction are set in the TiNet configuration. They
are given in mm: measurements are made from the tower; the zero
point is 15 mm below the upper edge.
The positions in the Z-direction depend on both the type of rack used
and on the sample head fittings.
Working position
Position during titration/measurement.
The beaker detector should stand on the beaker rim.
Take care that electrodes, stirrer and buret tips are sufficiently im-
mersed.
Rotation position, movement position
Position during the movement of the sample arm in the XY-direction.
Take care that electrodes, stirrer and buret tips are raised higher than
the beaker rims.
Rinsing position
Position during rinsing in the wash beaker.
Take care that electrodes, stirrer and buret tips are well located in the
rinsing spray of the wash beaker.
X-direction
Y-
direc-
tion