Metrohm 730 Sample Changer - Manuel (Page 108)

4.5 Sample Racks
730 Sample Changer, Detailed Description 105
If desired, other user-defined racks can be delivered and defined
in the instrument via PC software. Irregular arrangements of
beaker positions are also possible.
Every single rack can be identified by a unique magnetic code.
Rod magnets which are attached to the bottom of the rack can be
combined to form a 6-place binary code. The sample changer can
then automatically recognize the mounted rack. This is possible
when the rack is positioned with the first rack position under lift 1.
When changing a rack, the sample Changer should first be re-set
to the normal position by pressing the <RESET> key or
<ENDSEQ> and <ENTER>. This way the save recognition of a
rack and therefore the correct beaker positioning is made possi-
ble. An internal position table containing the unambiguous defini-
tion of the turning angles and beaker positions is assigned to each
rack type.
When a sample series is started the changer first runs the rack
automatically into the normal starting position so that it is always
ensured that the beaker positions correspond with the internal po-
sition table of the current rack.
The standard racks provided by Metrohm are already equipped
with a predefined magnetic code for every rack type. If several
racks of the same type are used, the magnet rods can be ar-
ranged differently so that a unique identification of a sample rack
is possible, if this is desired.
Format of a magnetic code (example):
000001 i.e. only one magnet is inserted, bit 0
000101 i.e. two magnets are inserted, bit 0 and 2
63 different combinations are possible. The code 000000 stands
for "no code defined".
In order to assign a certain sample rack for different applications,
certain properties or recognition data can be defined for up to 16
racks. This is useful when a certain beaker size or the size of the
sample series or a certain course of processing is to be predefined
in an application.