3. Connection of RRDE-3A and Potentiostat
Here we are connecting model 2325 potentiostat.
For detailed connection with another potentiostat, there is a quickly introduction in the section related to the connection to different brand of the potentiostat.
RRDE-3A remote connection
Electrode speed rotation and purge can be remotely controlled from the potentiostat. Four wires are required to use potentiostat as remote controller. The remote control cable is an optional cable, connected to the remote terminal on the back of the RRDE-3A (Figure 3-1).
In case of coupling RRDE-3A with Model 2325 Bi-Potentiostat:
|Model 2325 optional cable (012558)||RRDE-3A input|
|A GND (green)||GND (next to IN)|
|D GND (black)||GND|
One volt corresponds to 1,000 rpm. It is possible to set from 90 to 8,000 rpm from 0 to 8 DC Volt.
The purge and pinch valve in the RRDE-3A is controlled by TTL level active low.
In case of coupling RRDE-3A with Non-ALS Instruments, the RRDE-3A should work, at least in manual mode, with virtually any instrument. Electrode cables should be attached to the appropriate connector according to the specifications of the device.
The reference and counter electrodes lead wires extend from the potentiostats. The connectors are the press-on type. Simply push the connector over the corresponding pin in the electrode to make the connection (Fig. 3-2). Aligator clips are color coded to the electrode which it attaches.
The ring electrode and the disk electrode connector are located under the motor shaft assembly.
Gas inlet connection:
The RRDE-3A includes 0.25" O.D. tygon tube and a gas line fitting. One end of the fitting connects to the ‘GAS INLET’ port on the rear panel of the RRDE-3A. To attach the line, simply push the connector (See Fig. 3-3).
The open end of the tygon tube is connected to a regulated gas supply. The inlet gas pressure must not exceed 5 psi.
To remove the tube from RRDE-3A, squeeze the retaining ring tab against the connector and then pull the tube and connector away from the RRDE-3A.
Cell and electrodes setting:
RRDE-3A is designed for easy cell replacement and to accommodate regular cells. Follow these instructions for initial cell placement:
|1) A glass cell vial is placed on the silicon plate.|
|2) A Teflon cap is put on the glass cell.|
|3) Reference electrode, counter electrode and purge tubings are fized at the cell holder.|
|4) Six holes are situated in the Teflon cap. These holes are for the reference electrode, counter electrode, working electrode, and purge tubings. Place the electrodes in the most convenient position.|
|5) Reference and counter electrodes are put into Teflon cap to adjust the desired position by O-Ring.
- Counter electrode - Red aligator clip
- Reference electrode - White aligator clip
Purge line connection:
The RRDE-3A has the ability to purge the sample solution with an inert gas. The purge removes oxygen by bubbling with an inert gas, typically Nitrogen or Helium through the solution.
The purge consists of two Teflon tubes going into the cell through the Teflon cap.
The tube with the black cover should be above the sample surface and the other one should be immersed into the sample solution.
You can adjust the tube length by moving the black part of the tube if needed.