Metrohm 858 Professional Sample Processor - Manual (Page 20)

2.5 The Swing Head ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
12 ￭￭￭￭￭￭￭￭ 858 Professional Sample Processor
Other user-defined racks can be supplied upon request and the required
rack data can be defined in the control software. Any arrangement of rack
positions is possible. The magnet code for user-defined racks is 110000.
Magnet codes
Every single sample rack can be unambiguously identified by means of a
magnet code. Magnetic pins in a holder attached on the underside of the
rack can be combined to make a binary, six-digit code. The Sample Pro-
cessor can thus recognize automatically which rack is in place.
When replacing a rack, this should first be returned to starting position
using the Rack initialization function (see "Manual Operation" in the
control software). This will enable an unambiguous recognition of the rack
and thus the correct positioning of the beaker. A positioning table is
assigned to each rack type in which for each rack position the rotation
angle and the distance to the middle of the rack is defined.
The standard racks supplied by Metrohm are already provided with a pre-
defined magnet code for each type.
Format of the magnet code (example):
000001 only one magnet is inserted, Bit 0
000101 two magnets are inserted, Bit 0 and 2
2.5 The Swing Head
The 786 Swing Head is an auxiliary drive for the Metrohm Sample Pro-
cessor series, e.g. the 858 Professional Sample Processor. It is a high-preci-
sion motor drive that makes it possible to move to any point position on a
sample rack. Even positions outside of the sample rack are reachable
when a suitable robotic arm is used.
Left-swinging or right-swinging models are available as different types of
robotic arms. "Left-swinging" means swinging from the initial position
(pointing towards the middle of the rack) outwards to the left.
The following diagram illustrates the most important configuration data
that needs to be set in the control software to ensure correct usage of a
robotic arm (left-swinging, here).