Metrohm 754 Dialysis Unit - Manual (Page 16)

2.3 Attaching the accessories
754 Dialysis Unit
13
2.3.3 Attaching the accessories to the 754 Dialysis Unit
Attach the tubing cartridges with the pump tubings to the 754 Dialysis
Unit. Proceed as follows (see Fig. 5 and Fig. 8):
9 Attach pump tubings
• Loosen both tubing cartridges 44 from the holding clamp 77 by
pressing down snap-action lever 88 and remove from mount-
ing pin 10 10 on 754 Dialysis Unit (see Fig. 1).
• Press contact pressure lever 55 on both tubing cartridges
down as far as it will go.
• Insert a length of pump tubing 31 31 (6.1826.030) for feeding the
acceptor solution into the first tubing cartridge as shown in
Fig. 6. The orange-yellow stopper 32 32 must click into the cor-
responding holder on the left-hand side of the tubing car-
tridge.
• Insert a length of pump tubing 30 30 (6.1826.040) for feeding the
sample into the second tubing cartridge. The black-black
stopper 32 32 must click into the corresponding holder on the
left-hand side of the tubing cartridge.
• Place the tubing cartridge for the acceptor solution and then
the tubing cartridge for the sample on mounting pin 10 10 and
press down on the right-hand side until snap-action lever 88
clicks into position on holding clamp 77. Take care that no
kinks are formed in the pump tubing.
2 Tubing connections for acceptor solution
• Mount a PEEK compression fitting 28 28 (6.2744.010) on the
end of the PEEK capillary 23 23 projecting from feedthrough 28 28
(see Fig. 5) and screw it on to coupling 29 29 (6.2744.030) (see
Fig. 6).
• Push coupling 29 29 on to the outlet end of the pump tubing 31 31
(see Fig. 6 and Fig. 8).
• Cut a piece of PTFE tubing (6.1803.030) to the desired length
for the suction tubing 26 26.
• Mount a PEEK compression fitting 28 28 (6.2744.010) on one
end of suction tubing 26 26 and screw this on to coupling 29 29
(see Fig. 6).
• Push coupling 29 29 on to the inlet end of the pump tubing 31 31
(see Fig. 6 and Fig. 8).
• Immerse the other end of the suction tubing 26 26 in a vessel
containing acceptor solution and fix in place. The acceptor
solution is usually ultrapure water that has previously been
degassed (with N
2
, He or a vacuum).