RRDE-3A Rotating Ring Disk Electrode

Rotating Ring Disk Electrode Rotator (RRDE-3) apparatus

RRDE-3A is a miniature rotator system for use in constant rotation and hydrodynamic techniques by rotating ring disk electrode in electrochemistry field. A short stainless steel shaft and 12 mm diameter electrode provide a concentric circle electrode system that is capable of high accuracy.

RRDE-3A is electronically controlled by a proportional-integral closed loop circuit driven by a DC servomotor. The compact electrodes are easily and rapidly interchangeable. The unit also provides an adjustable valve system for inert gas purging inside the cell vial.

RRDE-3A can be operated as a stand-alone unit and directly controlled by Model 2325 or other instruments. During or between electrochemical analyses, a built-in gas control allows purging the sample.
Besides, easy to remove and replace the cell vial, easy for rinsing, cleaning, and replacing electrodes.


Technical Note
Hydrodynamic Voltammetry

Other potentiostats

RRDE-3A Ver.2.0



Manual is available for download here.

rrde curve
rrde flow


  • 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


Improvement points of Ver.3.0

RRDE-3A Ver.3.0 is electronically controlled by a proportional-integral closed loop circuit driven by a DC servomotor. The main frame structure has been improved and the weight of the instrument has been reduced from 6.0 Kg to 3.5 Kg.

Design changes

  • The position of the power switch has been changed from the back to the front (next to the LCD display) (easy to operate).
  • The color of the LCD display changed from green to blue.
  • The clear warning button on the back has been removed. It is operated by the built-in software (easy to operate).
  • The built-in power supply is changed to an external power supply (for easier maintenance of the instrument).


New maintenance mode for the software

The new maintenance mode has been added to the software to facilitate the operation of the instrument and to help customers to keep track of the rotational wear and tear of the instrument, and to regularly clean and maintain the mechanical system in order to keep the instrument in optimum working condition.

RRDE-3A Ver.3.0 can perform the following settings in the maintenance mode added by the software:

  • Rotation speed setting unit change
  • Display of total rotation time and time to next warning
  • Clear warning display
  • Remote control input voltage monitoring

Click on the links below for detailed information on the operation of the maintenance mode.


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 12 VDC
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


RRDE-3A Rotating Ring Disk Electrode Apparatus Ver.3.0 contents

RRDE-3A Rotating Ring Disk Electrode Apparatus Ver.3.0 contents.

RRDE-3A Rotating Ring Disk Electrode Apparatus Ver.3.0 contents.
Cat# Description Qty
013725 RRDE-3A Rotating Ring Disk Electrode Apparatus Ver.3.0 1
Contents Qty
1 (013580) Sample vial for alkaline solution (100 mL) 1
2 012064 Spin coating adaptor 1
3 012065 Male connector for gas purge (PP) 1
4 013392 TYGON tubing, OD1/4” x ID1/8” 1
5 013271 RRDE-3A Teflon cap V.2 1
6 012642 RRDE-3A Sillicon sheet 100x180 mm 1
7 012975 O-ring for RRDE-3A Bearing assembly 3
8 - AC adapter 1
9 Power cable 1
  - Quick manual 1


Optional items

The reference electrode and counter electrode are not included in the contents, they are sold separately.
Below a squeezed list of the optional items:

Cat# Description
012167 RE-1B Reference electrode (Ag/AgCl)
012171 RE-7 Non Aqueous reference electrode (Ag/Ag+)
013373 RHEK Reversible hydrogen electrode kit
012961 Platinum counter electrode 23 cm
012962 Gold counter electrode 23 cm
012963 Nickel counter electrode 23 cm
012632 Sample vial (100 mL)
013580 Sample vial for alkaline solution (100 mL) (10 pcs)
013581 Sample vial for alkaline solution (200 mL) (8 pcs)
013582 RRDE-3A Teflon cap (for 200 mL)
013343 O-ring for RRDE-3A Teflon cap V.2
013645 O-ring for RRDE-3A Shaft (white) (3 pcs)
012641 O-ring for RRDE-3A Bearing assembly (10 pcs)
012074 CB-ES Remote cable
009131 Port plug


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.

※ RDE/RRDE/DRE electrodes are designed to be used in RRDE-3A Rotating Ring Disk Electrode Apparatus, we will not guarantee the operation when ALS RDE/RRDE/DRE electrodes are used in combination with RRDE apparatus made by other companies.


Movie contents

  • RRDE-3A easy setup
  • RRDE-3A disassembling/assembling for maintenance
  • RRDE-3A motor rotation issue
  • DRE electrode assembly methods Part1: Front Assembly
  • DRE electrode assembly methods Part2: Rear Assembly











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