Metrohm 838 Advanced Sample Processor Installation Instructions - Manual (Page 41)

3.3 Fitting the accessories
Metrohm 838 Advanced Sample Processor, Installation 35
3.3.15 Connecting pumps
Two external pumps can be connected and controlled on the 838 Ad-
vanced Sample Processor.
Ext.
Pump 2
The pump connections (for 3-pin M8 connectors) on the rear side of
the tower of the Advanced Sample Processor supply a voltage of 16 V
and may be loaded with max. 600 mA.
The appropriate pump models are:
• Metrohm 823 Membrane Pump Unit (membrane pump, suitable for
aqueous media without precipitation)
• Metrohm 772 Pump Unit (peristaltic pump, suitable for organic sol-
vents and aqueous solutions containing precipitation)
3.3.16 Connector dosing drives and stirrers
Metrohm Sample Processors feature various connections to which stir-
rers or dosing drives can be connected.
Stirrers
The 722/802 Rod stirrer and the 741 Magnetic stirrers feature a
DIN connector and are connected on the rear panel of the tower.
As is the case on other Metrohm instruments, the three MSB sockets
(MSB = Metrohm Serial Bus) can be used in diverse ways. Connect the
801 Stirrer at this point.
Dosing drives
Up to three dosing drives of Type 700/800 Dosino or 685/805 Dosi-
mat can be connected directly to the MSB sockets of a Sample Proc-
essor and operated. A 800 Dosino or 805 Dosimat can also be
connected via the MSB output socket of another instrument con-
nected to the MSB, such as the 801 Stirrer in a so-called 'daisy chain'. It
must be noted that only one single instrument of a specific type may
occur in such a chain, e.g. one 801 Stirrer and one 800 Dosino.
The 700 Dosino and the 685 Dosimat must be connected directly to
an MSB socket of the Sample Processor.
R S 2 3 2
M S B 1
M S B 3 M S B 2
R e m o te
Figure 27 MSB connections
A connected dosing drive is detected automatically by the instrument
only when switching on.
Dosing drive and
stirrer connections
MSB1…3