Metrohm 797 VA Computrace - Manual (Page 46)

2 Installation
797 VA Computrace / Hardware-Manual 8.797.8001EN
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2.6 Auxiliary electrode
2.6.1 Construction
The following electrodes can be used as the auxiliary electrode 43:
• 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 individual
parts are shown in Fig. 14.
2.6.2 Startup procedure
The 6.0343.000 Pt auxiliary electrode supplied as standard can be inserted directly in
the 797 VA Computrace Stand (→
2), whereas the GC auxiliary electrode available as
an option must first be assembled (→ 1):
1 Assembly of the GC auxiliary electrode
• Insert glassy carbon tip 116 through the locking ring 115 into the elec-
trode holder 114 as far as it will go.
Glassy carbon is a brittle, easily breakable material and must there-
fore 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 115.
2 Install auxiliary electrode in 797 VA Computrace Stand and connect
• Insert auxiliary electrode 43 in opening 54 of the measuring head 24 (see
Fig. 6).
• Attach electrode cable 41 (AE) to auxiliary electrode 39:
Push cable plug under the screw and tighten screw firmly.
• Turn auxiliary electrode 39 so that the electrode cable 37 points to the
rear and not to the side (in the latter position it may become kinked and
damaged when cover 2 is closed).