Metrohm 788 IC Filtration Sample Processor - Manual (Page 102)

4 Operation
788 IC Filtration Sample Processor
94
When a sample series is started the 788 IC Filtration Sample Processor
first runs the rack automatically into the normal starting position so that
it is always ensured that the vessel positions correspond with the inter-
nal position table of the current rack.
The rack code is used for automatic rack recognition. A code can be
assigned only once. The standard rack supplied by Metrohm already
have a predefined code. The rack code is a 6-place binary pattern with
the digits 0 and 1 and this has to correspond to the order of the rod
magnets. The digit 1 stands for a magnet which is inserted and 0 signi-
fies that no magnet is inserted. 63 different codes are possible (000001
to 111111).
Magnets inserted
In this example
the code is:
000110
Rack bottom view
In order to assign a certain sample rack for different applications, cer-
tain 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 se-
ries or a certain course of processing is to be predefined in an applica-
tion.
4.5.3 Rack data
The following recognition data can be defined for each rack:
Rack number unique identification
Code automatic rack recognition
Type rack type / position table
Work position working height of the needle
Rinse position rinsing height of the needle
Shift position turning height of the needle
Special position additional height of the needle
Special beaker position reserved beaker positions
The Rack number serves to identify a rack. It can be chosen from 1 to
16. In a method a particular rack number can be assigned to the proc-
ess sequences (see section 4.3.2). This ensures that if the wrong sam-
ple rack is used, the automatic rack recognition will realize this and is-
sue a warning to the user.