Owner manual

3.7 Auxiliary electrode
746 VA Trace Analyzer / 747 VA Stand
3-31
3.7 Auxiliary electrode
3.7.1 Construction
The following electrodes can be used as the auxiliary electrode 6060 (AE):
• 6.0343.000 Pt auxiliary electrode
supplied as standard
• 6.1241.020 Electrode holder and
6.1247.000 Glassy carbon tip
together form the glassy carbon auxiliary electrode
available as an option
The construction of the two auxiliary electrodes and the designations of the individ-
ual parts are shown in Fig. 18.
3.7.2 Startup procedure
The 6.0343.000 Pt auxiliary electrode supplied as standard can be inserted directly
in the 747 VA Stand (→ 2), whereas the GC auxiliary electrode available as an op-
tion must first be assembled (→ 1):
1
Assembly of the GC auxiliary electrode
• Insert glassy carbon tip 138138 through the locking ring 137137 into the elec-
trode holder 136136 as far as it will go.
Glassy carbon is a brittle, easily breakable material and must therefore
be inserted carefully into the electrode holder and handled gently.
If the GC tip breaks, the part remaining in the holder can be removed
by pulling out the locking ring 137137.
2
Install auxiliary electrode in 747 VA Stand and connect
• Insert auxiliary electrode 6060 in opening 7272 of the measuring head 4141
(see Fig. 9).
• Attach electrode cable 5858 (AE) to auxiliary electrode 6060:
Push cable lug under the screw and tighten screw firmly.
• Turn auxiliary electrode 6060 so that the electrode cable 5858 points to the
rear and not to the side (in the latter position it may become kinked and
damaged when cover 2424 is closed).