Metrohm 761 Compact IC - Manual (Page 37)

2.6 High-pressure pump
761 Compact IC
27
2.6.3 Connecting the eluent bottle
The eluent supply line from the storage bottle to the high-pressure
pump is connected as follows (see Fig. 11):
Only degassed (with N
2
, He or vacuum) and microfiltered (0.45 µ m
filter) eluents should be used!
The 6.1608.070 Eluent bottle (2 L) supplied is not suitable for
vacuum degassing. Use a pressure-resistant container for this.
Care must be taken that the eluent used is freely miscible with any
solvent remaining in the pump head (the pump head leaves the
factory filled with either isopropanol or methanol/water). If this is not
the case then the pump must first be rinsed with a solvent which is
miscible with both the previous eluent and the following eluent (e.g.
acetone).
1 Prepare eluent bottle
• Prepare, microfilter (0.45 µ m microfilter) and degas (with N
2
,
He, or vacuum) the suitable eluent for the required application
and separating column.
• Fill eluent into eluent vessel 67 (clear glass, 2 L).
• Place eluent bottle 67 at the front in bottle holder 10 on the
761 Compact IC (see Fig. 1).
2 Install bottle attachment
• Firmly screw threaded stopper 65 (6.1446.040; part of
6.1602.160) into the smaller threaded opening (M6) of bottle
attachment 66 (6.1602.105; part of 6.1602.160).
• Firmly screw aspirating filter 68 onto aspirating tubing 63.
• Pull the other end of aspirating tubing 63 through the larger
threaded opening (M8) of bottle attachment 66 from below.
• Push O-ring (E.301.0021; part of 6.1602.160) over the free
end of aspirating tubing 63 and move it towards bottle at-
tachment 66.
• Push tubing nipple 64 (4.420.4300; part of 6.1602.160) over
the free end of aspirating tubing 63, move it as far as re-
quired towards bottle attachment 66 and screw it loosely in
the larger opening of bottle attachment 66.
• Insert aspirating tubing 63 with screwed-on aspiration filter 68
into eluent bottle 67 and screw bottle attachment 66 onto
eluent bottle 67.
• Pull aspirating tubing 63 so far through the opening of tubing
nipple 64 that aspirating filter 68 is touching the bottom of
eluent bottle 67.
• Fix aspirating tubing 63 in place by screwing shut tubing
nipple 64.