Metrohm 746 VA Trace Analyzer - Manual (Page 568)

8.2 747 VA Stand
746 VA Trace Analyzer / 747 VA Stand
8-7
Measuring amplifier
Max. phase error 1° at 250 Hz
Resolution ≈ 24 pA
Multi-mode electrode MME (working electrode WE)
Designation 6.1246.020
Electrode types DME (dropping mercury electrode)
HMDE (hanging mercury drop electrode)
SMDE (static mercury drop electrode)
Drop surface 0.15 ... 0.60 mm
2
(DME and SMDE)
Glass capillary 6.1226.030 (set of 10)
internal diameter = 0.05 mm
Mercury reservoir 6 mL ≅ 81.2 g
sufficient for ca. 200'000 Hg drops
Auxiliary power inert gas (generally nitrogen N
2
)
p = 1 ± 0.2 bar
Rotating disk electrode RDE (working electrode WE, option)
Construction 6.1246.000 Drive shaft + screw-on
6.1204.XXX Electrode tip
Electrode tips 6.1204.100 Ultra trace graphite
6.1204.110 glassy carbon (GC)
6.1204.120 platinum (Pt)
6.1204.130 silver (Ag)
6.1204.140 gold (Au)
Disk diameter 2.0 +0 / –0.05 mm
Radial eccentricity ≤ 0.2 mm
Regeneration with 6.2802.000 Polishing kit
Rotational speed 200, 400, 600, ... , 3000 min –1
Speed constancy ± 2 %
Reference electrode (RE)
Construction double-junction;
6.0728.0X0 Ag/AgCl Reference system +
6.1245.010 Electrolyte vessel to be filled by user
Reference system Ag/AgCl/c(KCl) = 3 mol/L
Diaphragm ceramic diaphragm
diameter = 3 mm
Auxiliary electrode (AE)
Pt auxiliary electrode 6.0343.000 Platinum electrode
GC auxiliary electrode
(option)
6.1241.020 Electrode holder + 6.1247.000 Glassy
carbon tip