Metrohm 791 VA Detector - Manual (Page 17)

2.4 6.5303.030 ELCD cell for IC
791 VA Detector
11
2.4 6.5303.030 ELCD cell for IC
2.4.1 Assembling the ELCD cell
The reference electrode and working electrode must be inserted in the
6.5303.030 ELCD Cell supplied with the 2.791.0020 VA Detector. The
cell is then screwed into the detector block built into the 733 IC Separa-
tion Center. Proceed as follows (see Fig. 5 and Fig. 6):
1 Insert reference electrode
Reference electrode 39 (6.0727.000, details see section 3.2.2)
included in the supply is already filled with c(KCl) = 3 mol/L and
protected with a cap. It is assembled as follows (see Fig. 5):
• Screw off the cap of electrolyte storage vessel 41 of reference
electrode 39. Normally PTFE gasket 31 remains in the cap
and can be left there.
• Insert one of the supplied PTFE gaskets 31 into the corre-
sponding opening of cell body 32 and screw reference elec-
trode 39 into this opening.
2 Insert working electrode
Working electrode 28 is not supplied with the 791 VA Detector
and must be ordered separately. Details about the working
electrodes and information about pretreatment (e.g. polishing)
can be found in section 3.2.1. A working electrode is assembled
as follows (see Fig. 5):
• Insert working electrode 28 in screw nipple 29.
• Push one of the supplied PTFE gaskets 31 sufficiently far
along the working electrode from below.
• Carefully insert working electrode 28 into the corresponding
opening of cell body 32 from above and press it in until it
clearly clicks into position.
• Push screw nipple 29 downwards and screw it in.
3 Connect ELCD cell to the detector block
The ELCD cell is screwed onto the 1.733.0X10 Detector block
mounted inside the 733 Separation Center. Proceed as follows
(see Fig. 5 and Fig. 6):
• Screw cell body 32 onto detector block 42 with the help of
the two red knurled screws 43.
• Push one of the supplied PTFE gaskets 31 over screw nipple
33 and screw this into the corresponding opening of cell
body 32.
• Place a screw nipple 36 and a PTFE gasket 35 on the outlet
end of the outlet capillary 37 permanently connected to de-
tector block 42.
• Insert outlet capillary 37 with screw nipple 36 in place into
screw nipple 33 and press in outlet capillary 37 until it
reaches the stop.