Metrohm 833 IC Liquid Handling Unit - Manual (Page 49)

6.1 Connection to modular IC system for neutralization
833 IC Liquid Handling Unit / Instructions for Use 8.833.1003
41
8 Start-up 833 IC Liquid Handling Sample Preparation
Unit
• Switch on 833 LH Pump Unit with mains switch 8.
• Set the contact pressure for both cassettes: press contact
lever 5 until the solutions are just aspirated. Then press the
contact lever up by 1 further click to achieve the optimum
contact pressure.
• Check all the tubing from the storage containers to the 833 IC
Liquid Handling Unit and the sample preparation module
through to the waste bottles for leaks. If any liquid should be
leaking then the corresponding connection must be tightened
up or replaced.
• Before the sample preparation module is used for the first
time the cation exchanger material must be conditioned. This
is done by injecting e.g. 30% NaOH 15 times (5 injections per
unit). You can use the program described in the following
section for the system “Neutralisation.smt” with a running
time of 20 min; the column does not need to be mounted.
6.1.2.2 Settings in IC Net
When setting up the 833 IC Liquid Handling Sample Preparation Unit
and the 833 IC Liquid Handling Unit the “New system wizard” of the IC
Net program demands the assignment of an “Event line” for the sample
preparation module and the suppressor module. Although this does not
exist you should still select any unused Event line so that the “New
system wizard” can continue. In fact the sample preparation module is
controlled from the 766 IC Sample Processor and the suppressor
module from the Event Line of the 820 valve B (see Fig. 12).
Apart from the main program “Neutralisation.smt” two further programs
should be created for the 766 IC Sample Processor in separate system
files. The 766 program in the system file “Start-Neutralisation.smt” only
starts the peristaltic pump (833 Pump) and rinses the sample
preparation module in all three positions. “End-Neutralisation.smt”
switches the pump off (833 Pump).
The peristaltic pumps of the 833 IC Liquid Handling Sample Preparation
Unit (833 Sample Prep) and the 833 IC Liquid Handling Suppressor
Unit (833 Suppressor, see Fig. 12) start immediately when the system
is activated (recording the baseline). This is done by activating the
option ’Start pump with startup hardware’ in IC Net for each
instrument.