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
  • Operable as RDE and RRDE
  • Remote and manual controlled rotation and gas purge
  • Allows remote control from the PC (rotational speed ON/OFF and gas purge ON/OFF)
  • Rotational speed range 100~8,000 rpm (2000 to 3000 rpm or less is recommended when using DRE)
  • Speed and purge time displayed by LCD display
  • "Model name", "Enclosure version" and "Cumulative total rotation time of the motor" displayed by LCD display
  • "Cleaning" and "Replacement" alert displayed by LCD display
  • Gas line connector is available
  • Purge valve timer control ON/OFF (can be set up to 9999 seconds)
  • Cell lead connects to all potentiostats
  • Open architecture for easy access to cell
  • Shaft is completely insulated for the motor by coupling unit to reduce motor noise
  • In the shaft assembly, the inner and outer tube is completely insulated by Teflon spacer to reduce noise


Size 190 x (Base: 230, Body: 120) x 400 mm
Weight 6 kg
Rotational range 100 to 8,000 rpm
Rotation stability Error, < 1% at100 to 1,000 rpm rpm
         < 0.5% at > 2,000 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 100-240 VAC, 50/60 Hz
Operating temperature 10 to 50 deg C
Relative humidity ≤ 80%
Inlet gas pressure 5 psi (34 KPa) maximum
Remote control One volt corresponds to 1,000 rpm
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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