Metrohm 717 Sample Changer - Manual (Page 10)

2.3 Arranging the Accessories
717 Sample Changer, Installation 8
The pump heads of the diaphragm pump, the fittings and the cou-
pling rings are made of PVDF. PVDF is resistant to many chemi-
cals. Acetone, acetanhydride or dimethylformamide (DMF) should
not
be used. The diaphragm, and the inner parts of the valves
consist of PTFE and are resistant to most chemicals.
If your samples contain solids (e.g. silver chloride) or sticking sub-
stances, you should use the 772 Peristaltic Pump Unit in combina-
tion with the 731 Relay Box instead of the diaphragm pump inte-
grated into the changer.
The PE canisters (6.1621.000) are suitable for aqueous solutions.
2.3.2 Tubing Fixation
In order to fix the tubing in
the guide chain any chain link
may be opened with a screw
driver or another appropriate
tool.
2.3.3 Magnetic Stirrers
Magnetic stirrers 2.741.0010
may be placed in any
position on the stirrer rail
beneath the rack.
Rack
Stirrer rail