Metrohm 791 VA Detector - Manual (Page 32)

3 Operation
791 VA Detector
26
3.4 Startup
3.4.1 Preparing the ELCD cell
The ELCD cell must be correctly connected to the HPLC or IC system
before it is filled (see section 2.3 and section 2.4). Then proceed as fol-
lows:
1 Fill reference electrode (only if necessary)
Reference electrode 39 (6.0727.000) is supplied in a filled
condition. However, the KCl electrolyte solution must be re-
placed every 1 to 2 months. Proceed as follows:
• Screw Ag/AgCl reference system 40 out of electrolyte vessel
41 (see Fig. 5).
• Fill electrolyte vessel 41 to the brim with c(KCl) = 3 mol/L.
• Screw Ag/AgCl reference system 40 back onto electrolyte
vessel 41. Take care that no air bubbles are found in the elec-
trolyte vessel (to check: hold reference electrode against the
light).
2 Connect reference electrode
• Insert reference electrode 39 into cell body 32 (see Fig. 5).
• Connect reference electrode 39 to connection 17 of the 791
VA Detector with 6.2120.020 Cable (see Fig. 7).
3 Connect auxiliary electrode
• Connect the auxiliary electrode in cell body 32 to connection
15 of the 791 VA Detector 791 with 6.2120.020 Cable (see
Fig. 7).
4 Prepare working electrode
• Prepare and polish working electrode 28 according to section
3.2.1.
• Insert working electrode 28 into cell body 32 (see Fig. 5).
• Do not connect working electrode 28 to the 791 VA Detector
at this point.
5 Start pump
• Switch on delivery drive of HPLC or IC pump.