EmStatMUX8-R2: USB powered potentiostat with integrated 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.

Product Description

The EmStat can be combined with a multiplexer forming one integrated instrument to perform measurements with multiple electrode systems. With the MUX8-R2 connecting arrays or other setups made of up to eight working electrodes in two or three electrode cell types is possible. If more channels are required, one or more MUX-R2 can be stacked to the EmStatMUX to add up to 128 channels.

The potentiostat is controlled as well as powered by USB and is used with PSTrace. The MUX 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 simultaneous. Via the script window of PSTrace it is also possible to perform a different experiment with each of the channels.

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.

Cell Connections

For more information go to tab “Cell Connections


Software for Windows and Android

Our standard software for all single channel instruments PSTrace  comes standard on a CD and is available to download. For controlling our potentiostats using a phone or tablet download PStouch for Android. It is available for free in the Google Play store.


The following techniques are supported by EmStatMUX.

Voltammetric techniques:

  • Linear Sweep Voltammetry (LSV)
  • Differential Pulse Voltammetry (DPV)
  • Square Wave Voltammetry (SWV)
  • Normal Pulse Voltammetry (NPV)
  • Cyclic Voltammetry (CV)

These methods can all be used in their stripping modes which are applied for (ultra-) trace analysis.

Techniques as a function of time:

  • ChronoAmperometry (CA)
  • Pulsed Amperometric Detection (PAD)
  • Multiple Pulse Amperometry (MPAD)
  • Open Circuit Potentiometry (OCP)
  • Multistep Amperometry (MA)
  • Mixed Mode (partly) (MM)


With EmStat potentiostat version:33+
dc-potential range± 3.000 V± 4.000 V
compliance voltage± 5 V± 8 V
dc-potential resolution0.1 mV0.125 mV
dc-potential accuracy0.2 %0.3 %
current ranges1 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 resolution0.1 % of current range
electrometer amplifier input> 100 GΩ // 4 pF
rise timeapprox. 100 us
Integrated MUX8-R2 Multiplexer
number of channels 8 (up to 128 when daisy chained)
multiplexerswitches 8 x (WE, S, RE and CE)
on resistance for WE1.5 ohm typical
charge injection on WE20 pC typical
leakage current< 20 pA (5 pA typical) at 25 ºC
switching time2 ms
compliance voltage± 10 V
housingaluminium: 138 mm x 121 mm x 37 mm
weight +/- 500 g
temperature range0 ºC to + 50 ºC
power supplyUSB


The EmStatMUX8-R2 has the following connections:



Y-cable connects to both potentiostat sensor connector and (digital) 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


Connects to Input of next multiplexer, for daisy-chaining multiple multiplexers.


For connecting to PC or Android device
Channel 1-4

Connects to sensor cables 1-4

Channel 5-8Connects to sensor cables 5-8


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. 


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