Product Description

With this polypotentiostat one electrochemical cell can be equipped with 1, 2, 3 or 4 working electrodes and all of these will be measured parallel. The EmStat3 4WE consists of a standard EmStat3 potentiostat and additionally three polypotentiostat (bipotentiostat-like) modules.
All techniques supported by EmStat3 are available for the EmStat3 4WE.

Available modes

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, i.e. it is following the potential change of WE1.
  2. The potential of the additional WE has an independent fixed dc-potential.
Each potentiostat has eight current ranges: 1 nA to 10 mA with a resolution of 1 pA at the lowest current range and can automatically select the optimal current range.
4WE_onoverview
A cell can be setup with one reference and one counter electrode or one combined reference and counter electrode.

Techniques

The following techniques are supported by EmStat3 4WE.

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:

  • Chronoamperometry (CA)
  • 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

Specifications

EmStat3 4WE Main potentiostat Polypotentiostat modules
dc-potential range ± 3.000 V ± 3.000 V
compliance voltage ± 5 V ± 5 V
dc-potential resolution 0.1 mV 0.1 mV
max. dc-offset error 2 mV 3 mV
potential accuracy 0.2 % 0.2 %
current ranges 1 nA to 10 mA (8 ranges) 1 nA to 10 mA (8 ranges)
maximum current ± 20 mA typical and ± 15 mA minimum for the sum of WE1, W2, W3 and W4
current resolution 0.1% of current range, 1 pA at lowest current range
electrometer amplifier input  > 100 GOhm // 4 pF > 100 GOhm // 4 pF
rise time    approx. 100 μs approx. 100 μs

 

Housing:
dimensions 12 cm x 8.5 cm x 3,5 cm
weight  250 g
power     5 V external power supply (included)
interfacing    USB
PC recommendations Windows Vista,  7, 8 or 10 (32 and 64 bit) Dual core processor with 2 GB RAM

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

Software

MultiTrace's user interface

MultiTrace is our standard software for multichannel instruments. It is based on PSTrace  and comes standard on a CD as well as download. The channels can be controlled all at once or get individual commands. Also the scripting feature can be used individually or for all channels.

Documentation

– EmStat3 4WE (polypotentiostat) description

– Decision guide: Multiplexer, Polypotentiostat or Multipotentiostat.pdf

EmStat4WE