Metrohm 746 VA Trace Analyzer - Manual (Page 56)

3.6 Reference electrode
746 VA Trace Analyzer / 747 VA Stand
3-29
3.6 Reference electrode
3.6.1 Construction
The complete reference electrode (RE) 43 43 comprises two parts:
• 6.0728.0X0 Ag/AgCl reference system (122 122)
with ceramic diaphragm type D, diameter = 1 mm
6.0728.020 Reference system: Ag/AgCl/c(KCl) = 3 mol/L;
supplied in a holder filled with c(KCl) = 3 mol/L
as standard
6.0728.010 Reference system: Ag/AgCl
supplied dry (option)
• 6.1245.010 Electrolyte vessel (123 123)
with ceramic diaphragm type D, diameter=3 mm;
holds a second electrolyte solution (bridge
electrolyte) and thus forms with the 6.0728.020
Reference system a complete reference electrode
in the so-called double junction construction.
The construction of the reference electrode and the designations of the individual
parts are shown in Fig. 17.
43
123
130
131
132
122
124
125
126
127
128
129
Fig. 17: Construction of the reference electrode
43 43 Reference electrode
122 122 Reference system (6.0728.0X0)
123 123 Electrolyte vessel (6.1245.010)
124 124 Electrical connection for cable
"AE"
125 125 Vent opening
126 126 Ag/AgCl reference system
127 127 Electrolyte compartment with
internal electrolyte
128 128 Diaphragm support made of
PCTFE
129 129 Diaphragm
130 130 Vent opening
131 131 Electrolyte compartment with
bridge electrolyte
132 132 Diaphragm