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.
For more information go to tab “Cell Connections“
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.
- 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:
||± 3.000 V
||± 4.000 V
||± 5 V
||± 8 V
||1 nA to 10 mA (8 ranges)
||1 nA to 100 mA (9 ranges)
||± 20 mA typical
and ± 15 mA minimum
|± 100 mA typical
The current is measured using a zero resistance ammeter (ZRA).
|Potentiostat (controlled potential mode)
||≤ 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
||approx. 100 us
|Integrated MUX8-R2 Multiplexer
|number of channels
||8 (up to 128 when daisy chained)
||switches 8 x (WE, S, RE and CE)
|on resistance for WE
||1.5 ohm typical
|charge injection on WE
||20 pC typical
||< 20 pA (5 pA typical) at 25 ºC
||± 10 V
||aluminium: 138 mm x 121 mm x 37 mm
|| +/- 500 g
||0 ºC to + 50 ºC
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
Connects to sensor cables 1-4
||Connects to sensor cables 5-8
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.