Metrohm 757 VA Computrace - Manual (Page 40)

3 Installation
757 VA Computrace – Hardware
36
3.5 Reference electrode
3.5.1 Construction
The complete reference electrode (RE) 22 comprises two parts:
• 6.0728.0X0 Ag/AgCl reference system (101)
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 (102)
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. 13.
22
102
109
110
111
101
103
104
105
106
107
108
Fig. 13: Construction of the reference electrode
22 Reference electrode
101 Reference system (6.0728.0X0)
102 Electrolyte vessel (6.1245.010)
103 Electrical connection for cable
"AE"
104 Vent opening
105 Ag/AgCl filling
106 Electrolyte compartment with
internal electrolyte
107 Diaphragm support made of
PCTFE
108 Diaphragm
109 Vent opening
110 Electrolyte compartment with
bridge electrolyte
111 Diaphragm