Metrohm 838 Advanced Sample Processor Installation Instructions User Manual
Page 70
4.2 Care and maintenance
64
Metrohm 838 Advanced Sample Processor, Service, maintenance, faults
Please use only the specified
6.2744.000 PVDF pressure screws
for connection to the ultrafiltration cell. If you use the 6.2744.010
PEEK pressure screws, this may result in stress cracking on the ultrafil-
tration cell!
4 Closing the ultrafiltration cell
• Fit the lower section 45 onto the upper section 43 so that the
two parts fit perfectly.
• Using the 6.2621.070 Allen key, fully screw in and firmly
tighten the 5 screws 46.
5 Fitting the ultrafiltration cell
• After screwing the ultrafiltration cell together, insert it into the
holder 26 as shown in Figure 17 so that the heads of the
screws 46 are located in the holes provided in the holder.
• Fit the three capillary connections which were detached pre-
viously back on the inlet and outlet openings provided on the
ultrafiltration cell using the PVDF pressure screws 22.
6 Rinsing the ultrafiltration cell
• Each time the ultrafiltration membrane is replaced, any air still
in the filtration cell and in the lines must be removed. In order
to do this, rinse all lines with ultra-pure water from one of the
special beakers for instance:
• Place a 300 ml PE bottle with ultra-pure water as the rinsing
solution onto a special beaker position on the sample rack.
• Use the IC Net software to control the 838 Advanced Sample
Processor directly. Choose the corresponding system and
open the Manual control dialog box. You can run the indi-
vidual functions of the Sample Processor under Autosam-
pler. Please refer to the IC NET software Online Help
documentation for details of operation.
• Move the beaker with the rinsing solution above the lift with
MOVE.
• You can use the LIFT function to lower the needle into rinsing
position.
• Switch on the peristaltic pump with PUMP, and all connected
lines are then rinsed and any air they contain is removed.
• After an adequate time (e.g. 5 min), switch the pump back off
again with PUMP and move the needle back to home posi-
tion.