Metrohm 797 VA Computrace - Manual (Page 91)

4.1 Technical data
797 VA Computrace / Hardware-Manual 8.797.8001EN
83
Pulse amplitudes AC1, AC2: 1 mV … 1 V
DP, NP: –1 … 1 V
SQW: 0.15 mV … 1 V
Current measurement
Current ranges 10 nA … 10 mA in 7 ranges
Current resolution 0.2 % of the current range
Minimum current I
min
30 fA
Maximum current I
max
80 mA
Integration times 0.1 … 20 ms
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, HMDE and SMDE)
Glass capillary Standard capillary for polarography and stripping
voltammetry in alkaline solutions:
6.1226.030 (set of 10)
internal diameter = 0.05 mm
Silanized capillary for stripping voltammetry in acidic
solutions:
6.1226.050 (set of 10)
internal diameter = 0.05 mm
Mercury reservoir 6 mL ≅ 81.2 g; sufficient for ca. 200'000 Hg drops
Mercury quality ultra pure mercury, min. 99.999%
Auxiliary power inert gas (generally nitrogen N
2
”5.0”, min 99.999%); p
= 1 ± 0.2 bar
Rotating disk electrode RDE (working electrode WE)
Construction 6.1204.210 Drive shaft + screw-on
6.1204.XXX Electrode tips
Electrode tips 6.1204.110 glassy carbon (GC)
6.1204.120 platinum (Pt) unpolished
6.1204.130 silver (Ag)
6.1204.140 gold (Au) for Hg determination
6.1204.150 gold (Au) for As determination
6.1204.160 platinum (Pt) polished, for CVS
6.1204.170 platinum (Pt) polished, for CVS
6.1204.180 Ultra trace graphite (UT)
6.1204.190 Pt electrode tip (1 mm) for CVS, shaft
made of glass
Disk diameter 2.0 ± 0.1 mm
(6.1204.150 / 6.1204.170 disk diameter 3 ± 0.1 mm)
(6.1204.190 disk diameter 1 ± 0.02 mm)
Radial eccentricity ≤ 0.2 mm