Metrohm 796 Titroprocessor - Manual (Page 45)

3. Configuration
796 Titroprocessor, Instructions for use 39 39
3.2.1 Sample racks
A sample rack is a turntable which accepts sample beakers and which is
placed on the sample changer. As different sizes of sample beaker may be
required for different applications it is possible to use various types of
sample rack which can be easily exchanged for one another. Depending on
the diameter of the sample vessel, different racks provide space for different
numbers of samples. Multi-row sample racks can accept a larger number of
samples if a 759 Swing head is used. Metrohm supplies the following
predefined standard types of sample rack, among others:
Type No. of
samples Type of sample vessel Magnet code
predefined Order number
M12-0 12 *) 250 ml Metrohm sample beaker 000001 6.2041.310
M12-0 12 *) 150 ml beaker or
200 ml disposable beaker (Euro) 100000 6.2041.360
M14-0 14 200 ml disposable beaker (Euro) 000011 6.2041.370
M14-0 14 8 oz disposable beaker (US) 000101 6.2041.380
M16-0 16 150 ml beaker 000010 6.2041.320
M24-0 24 *) 75 ml Metrohm sample beaker 001000 6.2041.340
M48-1 48 **) 75 ml Metrohm sample beaker 010000 6.2041.350
*) simultaneous sample processing at two sample changer towers possible.
**) two-row rack for use with a 759 swing head .
On request further racks defined by the operator can be supplied and their
rack tables loaded into the Titroprocessor. Irregular arrangements of the
beaker positions are also possible.
Each individual sample rack can be unambiguously identified by means of
the magnet code. Magnetic rods, located on the base of the rack, can be
combined to form a binary 6-place code. This means that the sample
changer can identify the rack automatically. This is possible when the
sample rack is positioned with the first beaker position under Lift 1. When a
rack is changed the
<MAN CONTROL> key should first be activated and
then the sample changer brought to the initial position with the softkeys
[Sample changer][Reset]
. In this way the definite recognition of the
rack and thus the correct positioning of the beakers is possible.
When a series of samples is started the sample changer automatically
brings the rack to the initial position first so that a clear recognition of the
particular rack is always guaranteed.
The standard racks supplied by Metrohm are already provided with a
predefined magnet code for each type of rack. If several racks of the same
type are to be used then the magnetic rods can be arranged differently to
enable the unambiguous identification of a particular sample rack, should
this be required.
The format of the magnet code (example):
000001 i.e. only one magnet is inserted in the outer right-hand position
or bit 0
000101 i.e. two magnets are inserted, bits 0 and 2
63 different combinations are possible. Code 000000 stands for 'no code
defined'.