The EmStat can be combined a multiplexer to form 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, just connect another MUX-R2 to the EmStatMUX and you have 16 channels. This can be repeated until the maximum of 128 channels is reached.
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.
The default EmStatMUX8 package includes two double shielded sensor cables (Option A, see picture below) ending in 2 mm banana connectors. The 2 mm banana connectors are compatible with standard croc clips (they will be included in the quotation as optional). Alternative connection options are the High-density cable that terminates in ferrules (Option B) or a Connection (Screw) Terminal (Option C) to assemble your own wires. 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.
Our standard software for all single channel instruments PSTrace comes standard on a CD and available to download. For controlling PalmSens3 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)
The EmStatMUX8, a combined EmStat3 potentiostat with an 8 channel multiplexer, can be connected to 8 electrochemical cells or sensors. This multiplexer can be used with different electrode or sensor configurations:
- Eight separate cell or sensors each with a working, reference and counter electrode,
- Eight separate cell or sensors each with a working and combined reference and counter electrode,
- Cell or sensor array with eight working electrodes sharing a reference and a counter electrode,
- Cell or sensor array with eight working electrodes sharing a combined reference/counter electrode.
In all configurations the sensors can be multiplexed, leaving the not-selected electrodes or sensors at open circuit. Configurations 3 and 4 also have the possibility to apply the specified potential to all electrodes or sensors continuously. The multiplexers is supported by the PSTrace software and provide the possibility to select a channel and to start a measurement using the selected channel or measuring all channels consecutively. In amperometric mode all 8 channels can be measured simultaneously, yielding up to 8 curves in a single measurement.
The EmStatMUX16, a combined EmStat3 potentiostat with a 16 channel multiplexer, can be connected to 16 electrochemical cells or sensors. This multiplexer can be used with different electrode or sensor configurations:
- Sixteen separate cells or sensors each with a working and combined reference and counter electrode,
- Cell or sensor array with sixteen working electrodes sharing one reference and one counter electrode,
- Cell or sensor array with sixteen working electrodes all sharing one combined reference/counter electrode.
In configurations the working electrodes can be multiplexed, leaving the not-selected electrodes at open circuit, or in configuration 2 and 3 having the potential applied to all working electrodes continuously. The multiplexer is supported by the PSTrace software and provide the possibility to select a channel and to start a measurement using the selected channel or measuring all channels consecutively. In amperometric mode all 16 channels can be measured simultaneously, yielding up to 16 curves in a single measurement.