RRDE-3A Rotating Ring Disk Electrode Apparatus Ver.2.0  (SOLD OUT)

RRDE-3A Ver. 3.0 available
RRDE-3A Ver. 3.0

Rotating Ring Disk Electrode Rotator (RRDE-3) apparatus


RRDE-3A is a constant rotation system for use in hydrodynamic modulation rotating ring disk electrochemistry. A 7 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 precisely controlled by PWM (Pulse Width Modulation) signal. 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 Instrumetns, Inc., Bioanalytical Systems, Inc. electrochemical analyzers, model2325 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.


Technical Note
Hydrodynamic Voltammetry

Other potentiostats

  • Operating
  • Features
  • Specifications
  • RRDE-3A content
  • Working Electrode
  • Movies


  • 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

Improved point for Ver. 2.0

1. "Model name", "Enclosure version" and "Cumulative total rotation time of the motor" displayed by LCD display
→ Initial display:
When the power is turned on, the model name and enclosure version and the cumulative total rotation time (Total) of the motor are displayed on the LCD display for 3 seconds.

LCD Display - Initial display

2. "Cleaning" and "Replacement" alert displayed by LCD display
→ Shaft assembly cleaning warning:
When the cumulative operating time of the motor exceeds 200 H, a warning message of cleaning the shaft is displayed at the initial display.

LCD Display - Cleaning alert

→Carbon brush replace warning:
When the cumulative operating time of the motor exceeds 1000 H, warning message of brush exchange is displayed at initial display.

LCD Display - Replacement alert

3. Improvement of Bearing Assembly (from S/N: MB2XXX)
The bearing was renewed to a material with high corrosion resistance.
Renewed bearing assembly reduces the damage on the shaft assembly, and now you can use under a wide range of environments, such as fuel cell research.

Bearing comparison.
The above bearing was specially removed, from the (Cat. No. 012625) RRDE-3A Bearing assembly and (Cat. No. 013607) RRDE-3A High corrosion resistant bearing assembly, for the comparison. Please note that it can not be removed in practice.

4. Improvement of Shaft Assembly (from S/N: MC2XXX)
The design and material of the shaft assembly was renewed!
The design of the previous shaft assembly uses a PEEK ring at the end of the screw (fixing ring), which limited the application field for your resistance to some chemical compounds.
Also the o-ring (black) had a short life time, when you use continuously without change, the deformation was clear, see the below comparative picture for the previous (left) and renewed (right) shaft assembly.

Bearing comparison.

The updated (013643) RRDE-3A Shaft assembly Ver.2 (right) has an o-ring in Teflon material and almost the full shaft in stainless steel, including the fixing ring. And, the previous (012624) RRDE-3A Shaft assembly (left) had an o-ring in Viton and the PEEK fixing ring setting in the stainless steel shaft.


Size 190 x (Base: 230, Body: 120) x 400 mm
Weight 6 kg
Rotational range 100 to 8,000 rpm
Rotation stability Error, < 1% at 100 to 1,000 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

Cat# Description
RRDE-3A Rotating Ring Disk Electrode Apparatus Ver.2.0
(013580) Sample vial for alkaline solution (100 mL)
013271 RRDE-3A Teflon cap V.2
012064 Spin coating adaptor
012065 Male connector for gas purge (PP)
013392 TYGON tubing, OD1/4” x ID1/8”
012642 RRDE-3A Sillicon sheet 100x180 mm
012975 O-ring for RRDE-3A Bearing assembly, 3 pcs
Power supply cable
Instruction manual
Optional items
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
012641 O-ring for RRDE-3A Bearing assembly (10 pcs)
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

last modified 2020/05/15
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