5 sample racks – Metrohm 766 IC Sample Processor User Manual

Page 80

4.5 Sample racks

766 IC Sample Processor

4.5

Sample racks

4.5.1

Standard rack (6.2041.430)

Metrohm delivers the following standard sample rack for the 766 IC

Sample Processor:

Type

Number of

vessels

Type of vessel

Predef.

code

Predef.

rack no.

M129-2

127

PP Sample tube (6.2743.050; 11 mL)

PE Bottle (6.1608.080; 300 mL)

010001

If desired, other user-defined racks can be delivered and defined in the

instrument via PC software. Irregular arrangements of vessel positions

are also possible.

4.5.2

Magnetic code

Every single rack can be identified by a unique magnetic code. Rod

magnets which are attached to the bottom of the rack can be com-

bined to form a 6-place binary code. The 766 IC Sample Processor can

then automatically recognize the mounted rack. This is possible when

the rack is positioned in the normal position. When changing a rack, the

766 IC Sample Processor should first be re-set to the normal position

by pressing the key or and . This

way the save recognition of a rack and therefore the correct vessel po-

sitioning is made possible. An internal position table containing the un-

ambiguous definition of the turning angles and vessel positions is as-

signed to each rack type.
When a sample series is started the IC 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 internal 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).