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USB powered potentiostat with integrated multiplexer

  • potentiostat with integrated 8 channel multiplexer
  • potential range: ± 3V or ± 4V
  • compliance voltage: ± 5V or ± 8V
  • current ranges:  1 nA – 100 mA
  • maximum current: ± 100 mA
All specifications
PalmSens usually responds to your quotation request within one business day.


With the EmStat3MUX8-R2 you can connect arrays or other setups made of up to eight working electrodes in two or three electrode cell types. If more channels are required, one or more MUX-R2 can be stacked to the EmStatMUX8-R2 for a total of up to 128 channels.

The potentiostat is controlled as well as powered by USB and is used with PSTrace. The MUX8-R2 can sample different cells at a rate of 25 ms/cell. Usually a method needs to be finished to switch the cell but the fast sampling per cell makes it possible to measure time depending techniques, e.g. chronoamperometry, practically simultaneously. Via the script window of PSTrace it is also possible to perform a different experiment on each of the channels sequentially.

To make it easier for you to decide, if  a multiplexer or a multichannel device is more suitable for your application, we have created a short explanation of multiplexers, multichannels and polypotentiostats.


Voltammetric techniques

  • Linear Sweep Voltammetry (LSV)
  • Cyclic Voltammetry (CV)

Pulsed techniques

  • Differential Pulse Voltammetry (DPV)
  • Square Wave Voltammetry (SWV)
  • Normal Pulse Voltammetry (NPV)

Amperometric techniques

  • Chronoamperometry (CA)
  • Zero Resistance Amperometry (ZRA)
  • Chronocoulometry (CC)
  • MultiStep Amperometry (MA)
  • Pulsed Amperometric Detection (PAD)
  • Multiple-Pulse Amperometric Detection (MPAD)

Galvanostatic techniques

  • Open Circuit Potentiometry (OCP)

Cell connections

The default EmStatMUX8 package includes option A: two double shielded sensor cables 

  • Option A: Double shielded sensor cables with 2 mm banana connectors. The 2 mm banana connectors are compatible with standard croc clips (they will be included in the quotation as optional).
  • Option B: High-density cable that terminates in ferrules
  • Option C: Connection (Screw) Terminal  to assemble your own wires.
  • Option D: Screen Printed Electrode Connector

Each of these connection options can be used to connect 4 channels. When you add the EmStatMUX8 in the quotation basket we will make sure to include two units of the selected connection option so you can connect all 8 channels to the electrochemical cells. 


With EmStat potentiostat version: 3 3+
dc-potential range ± 3.000 V ± 4.000 V
compliance voltage ± 5 V ± 8 V
dc-potential resolution 0.1 mV 0.125 mV
dc-potential accuracy 0.2 % 0.3 %
current ranges 1 nA to 10 mA (8 ranges) 1 nA to 100 mA (9 ranges)
maximum current ± 20 mA typical
and ± 15 mA minimum
± 100 mA typical

The current is measured using a zero resistance ammeter (ZRA).

Potentiostat (controlled potential mode)
current accuracy ≤ 1 %of current range at 1 nA
≤ 0.5 % at 10 nA
≤ 0.2 % at 100 nA to 100 uA
≤ 0.5 % at 1 mA, 10 mA and 100 mA
all with max. 0.2 % offset error
measured current resolution 0.1 % of current range
electrometer amplifier input > 100 GΩ // 4 pF
rise time approx. 100 us
Integrated MUX8-R2 Multiplexer
number of channels  8 (up to 128 when daisy chained)
multiplexer switches 8 x (WE, S, RE and CE)
on resistance for WE 1.5 ohm typical
charge injection on WE 20 pC typical
leakage current < 20 pA (5 pA typical) at 25 ºC
switching time 2 ms
compliance voltage ± 10 V
housing aluminium: 138 mm x 121 mm x 37 mm
weight  +/- 500 g
temperature range 0 ºC to + 50 ºC
power supply USB
communication USB-C

The EmStatMUX8-R2 has the following connections:

Connector Function
Input Y-cable connects to both potentiostat sensor connector and (digital) AUX
AUX Can be used to measure auxiliary input like temperature or pH, and to switch external hardware using two digital control lines that can be set in PSTrace
Link Connects to Input of next multiplexer, for daisy-chaining multiple multiplexers.
USB-C For connecting to PC or Android device
Channel 1-4 Connects to sensor cables 1-4
Channel 5-8 Connects to sensor cables 5-8



PSTrace for Windows

PSTrace for Windows provides support for all techniques and device functionalities. With a smooth simple interface, showing only the applicable controls, PSTrace is suitable for all levels of user experience. Functions include:

  • Equivalent Circuit Fitting
  • Scripting for running an automated sequence of measurements on different channels
  • Open your data in Origin and Excel with one click of a button
  • Save all available curves, measurement data and methods to a single file
  • Direct feedback on method parameters

Download PSTrace on




Name Type Last updated
App Note – Multichannel, polypotentiostat or multiplexer This will help you to choose the ideal PalmSens multi-channel instrument for your application.08-04-20
OCP with MUX8-R2 Describes how to perform an OCP measurement on multiple channels of the MUX8-R208-04-20
EmStatMUX8-R2 Description Description of the EmStatMUX8-R2 instrument08-04-20

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