1. Introduction

RRDE-3A is a constant rotation system for use in hydrodynamic modulation rotating ring disk electrochemistry. A 12 mm diameter electrode with short stainless steel shaft provides for a miniature and concentric circle electrode system that is capable for highly accurate rotation and modulation even at radial modulation rates or wave forms.

RRDE-3A is electronically controlled by a proportional-integral closing loop circuit driving as an DC servo-motor. Electrodes are small and rapidly interchangeable. The unit also provides an adjustable valve system for inert gas purging inside the cell vial.

RRDE-3A is able to be operated as a stand-alone unit and directly controlled by CH Instruments Inc., Bioanalytical Systems Inc. Electrochemical Analyzers or other instruments. When the analysis starts, a built-in gas control allows purging the sample. Besides, the access to glass cell is easy for rinsing, cleaning, and replacing the electrodes. It is easy to remove and replace the cell vial.


  • Compact design & easy operation
  • Remote and manual controlled rotation
  • Quasi-oxygen free sample vial design (up to 200 mL)
  • Gas line connector is available
  • Remote and manual controlled purge lines
  • Teflon cap is adapted for ALS reference and counter electrodes
  • Operable as RDE and RRDE
  • Allows remote control from the PC (rotational speed ON/OFF and gas purge ON/OFF)
  • Cell lead connects directly to Model 2325 or other potentiostats
  • Open architecture for easy access to cell


Size 190 (w) x (Base: 230, Body: 120)(d) x 400 (h)mm
Weight 3.5 kg
Rotational range 100 to 8,000 rpm
Rotation stability Error, < 1% at 100 to 1,000 rpm
         < 0.5% at > 1,001 rpm
Ring/Disk insulation resistance > 10 M ohm
Electrode to lead pin contact resistance 5 ohm
Rotator shaft Stainless steel
Motor 12 V, ironless core, low inertial DC servo
Power < 100 VA 100-240 VAC, 50/60 Hz
Operating temperature 10 to 50 deg C
Relative humidity ≦ 80%
Inlet gas pressure 5 psi (34 KPa) maximum
Remote control Motor ON/OFF TTL or relay input to back panel connection
Purge TTL or relay input to back panel connection


Various kinds of RRDE electrode & RDE electrode

For RRDE electrode
RRDE electrode
Click here for detail
Platinum ring disk working electrode
Platinum ring-glassy carbon disk working electrode
For RDE electrode
RDE electrode
Click here for detail
Glassy carbon disk electrode
Platinum working disk electrode
Gold working disk electrode
For DRE electrode
DRE electrode
Click here for detail
DRE-PGK Pt ring/GC disk replaceable electrode
DRE-GCK disk replaceable electrode
Electrodes of other materials and diameters will be fabricated on a custom basis.

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last modified 2014/10/21