Metrohm 797 VA Computrace - Manual (Page 9)

1.1 Instrument description
797 VA Computrace / Hardware-Manual 8.797.8001EN
1
1 Introduction
1.1 Instrument description
797 VA Computrace is a PC controlled system for voltammetry, which consists of the
following parts:
1.797.0010 VA Computrace Stand with accessories
6.2151.020 Connecting Cable
6.6053.030 797 VA Computrace Software (current version)
For a detailed description of the PC software «797 VA Computrace Software» see the
797 Software Manual.
This 797 Hardware Manual describes the installation and maintenance of the 797
VA Computrace Stand and its accessories. The central element of this Stand is the
Multi-Mode Electrode (MME), which combines the dropping mercury electrode
(DME/SMDE) and the stationary hanging mercury drop electrode (HMDE) in a single
construction. The rotating disk electrode (RDE) can also be used in the stand.
The 797 VA Computrace Stand is controlled with the PC-Software «797 VA Compu-
trace Software», parameters necessary for the VA measurement are sent from the PC
to the VA Computrace via USB connection. The data acquisition at the 797 VA Com-
putrace Stand is started and controlled by the PC-Software «797 VA Computrace
Software», which receives and stores the measurement data. At the end of the de-
termination, the recorded data are sent back to the PC where they are evaluated and
saved in a determination file.
Operation of the 797 VA Computrace Stand follows the potentiostatic 3-electrode
principle in which the voltage of the working electrode is controlled by means of a vir-
tually currentless reference electrode to the preset desired value and the current flows
across a separate auxiliary electrode.