Metrohm 788 IC Filtration Sample Processor - Manual (Page 103)

4.5 Sample racks
788 IC Filtration Sample Processor
95
The Code is used for automatic rack recognition. Make sure that this 6-
place binary code in the rack configuration agrees with the actual in-
serted magnet code on the rack. Rack codes can be changed at any
time. They must however, only be assigned to one rack. The assign-
ment of standard predefined codes of standard racks provided by
Metrohm should be avoided. There is one code which can be used for
this purpose. It is normally used for special racks: 110000.
The rack Type serves for the assignment to a position table internal to
the instrument, in which the positions of the sample tubes in the rack
are defined in tenths of a degree (0-3599) of the full turning angle. The
rack type is coded as Mxxx-y , whereby M stands for Metrohm-defined
types. The placeholder xxx stands for the number of sample tubes in a
rack. The numerical code y is a special code for the number of rows on
a rack (0 = single-row, 1 = double-row, 2 = triple-row). Position tables
for user-defined rack types can be created with a suitable PC software
and introduced into the instrument via the serial interface. The name of
the rack type may be chosen at will this way.
The Work position determines the height of the needle in which the
sample solution is aspirated. In this way the ideal position for every
sample rack can be chosen dependent on the height of the sample
tubes. This work position can be accessed directly in manual operation
with the <END> key. In a process sequence this can be programmed
with 'LIFT :1 : work mm' .
The Rinse position determines the correct position of the needle in
which, for example, a rinsing solution should be aspirated. In this way
the ideal position for every sample rack can be chosen dependent on
the height of the sample tubes. This rinse position can be accessed
with 'LIFT :1: rinse mm' .
The Shift position determines the correct position of the needle, in
which the rack can be turned. This height must be 0 mm for the 788 IC
Filtration Sample Processor. If the lift is not at or above the shift posi-
tion, the sample rack can not be turned in manual operation. This is a
safety feature to prevent damage to the needle due to turning maneu-
vers of the rack. However, a prerequisite is that this shift position is cor-
rectly set. In a process sequence the positioning of the lift to the shift
position can be programmed with 'LIFT :1 : shift mm' .
The Special position determines an additional user defined height of
the needle. This special position can be accessed with 'LIFT :1 :
special mm' .