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Chapter 5 Operation modes & Parameters 55
Internal organization
At the working electrode (WE) in the electrochemical flow cell the electron
transfer takes place due to an oxidation or reduction reaction. The result-
ing electrical current is amplified by the current-potential (I/E) converter
(Fig. 12).
Fig. 12. ROXY Exceed signal processing from EC flow cell to output.
The signal from the I/E converter can be compensated with auto zero or
offset, and is digitized using a 24-bits ADC. In the CPU the signal is pro-
cessed, for example noise filtering, or more complex data processing in
PAD. Finally after the 16-bits DAC the signal is set to a 1 V full scale ana-
log data output (by default Output = ADC). Also the true analog signal from
the I/E converter (before AD conversion) is available
via the ‘Analog data
output’ connector. This output can be selected in the CONFIG menu by
setting the parameter Output = I/E.
Dual flow cell control
The ROXY Exceed electronics are located on 2 different PCB's (printed
circuit boards). The
control board and the sensor board. The control board
is dedicated to communication with PC (LAN) and keyboard & display. It
has a processor with a so called 'event handler' that takes care of all user
commands and hardware interrupts. The sensor board is fully dedicated to
data acquisition and flow cell control. By using this architecture it is possi-
ble to extend the functionality of the potentiostat to more than one flow cell
by simply adding a sensor board. The ROXY Exceed can be equipped with
up to two sensor boards (DCC). Typically, in a dual EC flow cell configura-
tion one can work in a serial or parallel configuration.