EmStat3 4WE


With this polypotentiostat one electrochemical cell can be equipped with 1, 2, 3 or 4 working electrodes and all of the WE’s will be measured in parallel. The EmStat3 4WE consists of a standard EmStat3 potentiostat and additionally three bipotentiostat modules, thus all techniques an EmStat3 is capable of are available for the EmStat3 4WE.

Each potentiostat has eight current ranges: 1nA to 10mA with a resolution of 1pA at the lowest current range and the device can automatically select the optimal current range.

A cell can be set up with one reference and one counter electrode or one combined reference and counter electrode.

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

If you want more information about the difference between a multiplexer, a multichannel device and a polypotentiostat, download the PalmSens guide on this subject in the documents section.

Supported Techniques:

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.

Technique as a function of time:

  • Amperometric Detection (AD) (Chronoamperometry)
  • Pulsed Amperometric Detection (PAD)
  • Multiple Pulse Amperometry (MPAD)
  • Open Circuit Potentiometry (OCP)
  • Multistep Amperometry (MA)

The additional WE’s can each individually be used in two different modes:

1. The potential of the additional WE has a constant DC-potential offset with respect to WE1

2. The potential of the additional WE has an independent fixed DC-potential


EmStat3 4WE Main potentiostat Polypotentiostats
DC potential range ±3V ±3V
Compliance voltage ±5V ±5V
DC potential resolution 0.1mV 0.1mV
DC potential accuracy 0.2 0.2
Current ranges (no. of ranges) 1nA to 10mA (8) 1nA to 10mA (8)
Maximum current ±20mA typical & ±15mA minimum ±20mA typical & ±15mA minimum
Current resolution 0.1 of current range, 1pA at lowest current range 0.1 of current range, 1pA at lowest current range
Electrometer amplifier input >100GOhm // 4pF >100GOhm // 4pF
Rise time approx. 100µS approx. 100µS