User guide

2.3 Attaching the accessories

754 Dialysis Unit

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):

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 1010 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 3131 (6.1826.030) for feeding the

acceptor solution into the first tubing cartridge as shown in

Fig. 6. The orange-yellow stopper 3232 must click into the cor-

responding holder on the left-hand side of the tubing car-

tridge.

• Insert a length of pump tubing 3030 (6.1826.040) for feeding the

sample into the second tubing cartridge. The black-black

stopper 3232 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 1010 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.

Tubing connections for acceptor solution

• Mount a PEEK compression fitting 2828 (6.2744.010) on the

end of the PEEK capillary 23 23 projecting from feedthrough 2828

(see Fig. 5) and screw it on to coupling 2929 (6.2744.030) (see

Fig. 6).

• Push coupling 2929 on to the outlet end of the pump tubing 3131

(see Fig. 6 and Fig. 8).

• Cut a piece of PTFE tubing (6.1803.030) to the desired length

for the suction tubing 2626.

• Mount a PEEK compression fitting 2828 (6.2744.010) on one

end of suction tubing 2626 and screw this on to coupling 2929

(see Fig. 6).

• Push coupling 2929 on to the inlet end of the pump tubing 3131

(see Fig. 6 and Fig. 8).

• Immerse the other end of the suction tubing 2626 in a vessel

containing acceptor solution and fix in place. The acceptor

solution is usually ultrapure water that has previously been

degassed (with N

, He or a vacuum).