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2 Channel Potentiostat
“The Most Versatile
Bi-Potentiostat on the Market”
• 2 electronically independent channels or
2 working electrodes with 1 CE and 1 RE
• Each channel can operate independent or
• From 1 nA up to 400 mA (Standard)
• From 100 fA up to 400 mA (Low current option)
• From 1 nA up to 20 A (Booster option)
• Current auto-ranging
• Rotating electrode control
• Simultaneous measurement of potential and current
• 20 Volts Control Voltage Range
(adjustable from –20 V to +20 V)
• 200 µSec software time base
• Ethernet communication
• 2 Auxiliary Inputs per Channel
• 2, 3, 4 and 5 Terminal measurements
• Data channel buffers in the BI-STAT retain data
even if the PC is disconnected
• LabView® Virtual Instruments are available
The BI-STAT is a computer-controlled 2-channel potentiostat/galvanostat. Each channel of the BI-STAT
can be controlled independently or used in conjunction with each other to perform the same or a different
experiment on different electrodes. In addition, the 2 channels can be used with one common reference
and one common counter electrode (BI-STAT mode). It is the only Bi-Potentiostat on the market that can
be used as two separate full-function potentiostats.
Each potentiostat is capable of ±10 V scan ranges, 400 mA current capabilities with 20 V control voltage,
and a time base of 200 µSec.
Each channel of the Bi-Potentiostat can be equipped with a low current option providing sub-pA resolution,
or they can be interfaced to a current booster for high current applications.
The Bi-Potentiostat unit comes complete with 32-bit Windows-based electrochemistry software.
Communication protocol is Ethernet-based.
General Description
The BI-STAT Bi-Potentiostat is a 2 channel version of the versatile Multi-Potentiostat product (VMP2). The BI-STAT can be configured
to operate as two independent potentiostats, or in the "Bi-potentiostat" mode. This allows for the use of one reference and one
counter electrode to work with two working electrodes.
Each channel of the BI-STAT can be equipped with the "p" low current option, providing sub-pA resolution. This option extends the
current ranges down to 1 nA full scale with a resolution better than 0.1 pA.
NOTE: The BI-STAT potentiostat is not designed to perform Electrochemical Impedance Spectroscopy.
Current and Voltage
The BI-STAT has a maximum continuous current specification of 400 mA on each channel. Each
channel can be boosted up to 20 Amps, depending on which power booster is interfaced to it.
The minimum current range is 10 µA, with a resolution of 15 pA. Current auto-ranging is available
in the BI-STAT.
The reference voltage range is ±10 V. The minimum potential step is 300 µV on the 20 V
dynamic range. Using Adaptive Signal Generation, the resolution of the BI-STAT can be as low as
3 µV depending on the voltage scan range desired.
The current range of the BI-STAT can be extended down to the femtoAmp region with the
addition of a low current option to one or both channels. The resolution on this option is 50 fA.
Programmable Compliance Voltage
Programmable compliance voltage is a unique BI-STAT feature. The BI-STAT has a 20 V
compliance specification. Because the BI-STAT is a virtual ground instrument, the compliance
voltage can be adjusted based on where the virtual ground is set. For example, one can program
the virtual ground to +5 V, allowing the BI-STAT channel to operate between –5 to +15 V.
Time Base
The data acquisition rate of the BI-STAT is 200,000 samples per second. Software techniques
utilize this sampling rate to provide a time base for experimentation of 200 µS.
Low Current Option
Auxiliary Input/Output
The BI-STAT has two general-purpose analog inputs with programmable ranges of ±2.5 V, ±5 V and ±10 V. These can be used to
record temperature, pressure, or another variable that can be converted to a voltage. There is also a TTL signal in and TTL signal out
(triggers) to enable experiments to be coordinated precisely with other instrumentation events that could be necessary in your
Computer Interface
Ethernet communication is utilized by the BI-STAT. This allows for fast data transfer and the ability of multiple users to interface to the
unit. Each student or technician could have one channel to do their experiments and control that channel from their own computer.
The ability to monitor the progress of an experiment can be accomplished from your office desk, away from the laboratory. All the
benefits of Ethernet and LAN are available to the BI-STAT. Also, one computer can easily control multiple BI-STAT units.
Downloadable "Firmware"
The firmware for the BI-STAT can be downloaded from the newest version of the software available. In this way, as new techniques
are implemented in the software, the proper firmware modifications can be downloaded to the BI-STAT hardware unit to allow the unit
to execute the necessary commands.
The BI-STAT also includes automatic calibration for the individual channels that can correct for internal offset and gain errors. The
user can run the calibration from the software, when needed, simply by disconnecting the cell cable and selecting calibrate from the
option menu. The calibration information is stored into the channel memory. Adding a low current option to an existing unit requires
this calibration routine to be run.
2 Channel Potentiostat
As of this printing, Princeton Applied Research offers over 34
techniques for the BI-STAT. These techniques include Cyclic
Voltammetry, Differential Pulse and Chronoamperometry for basic
electrochemical research.
For corrosion, there are the standard corrosion techniques, plus multielectrode techniques that utilize the "N-stat" feature of the BI-STAT,
where two working electrodes can be used with one reference and
one counter electrode. The BI-STAT is ideal for Hydrogen permeation
In the battery application area, there are dedicated protocols to
perform accepted test procedures on fuel cells and batteries. The
user has the ability to program almost any series of pulses and holds
to an electrode using a unique spreadsheet format for protocol
creation. This feature also benefits the electro-plating applications
area where designer pulse waveforms are being used to deposit
materials on substrate surfaces
Powerful Graphics
The graphics package of the BI-STAT software enables the user to
have excellent flexibility in displaying data. In addition to being able to
see the data in the units common to the technique on the display, the
user can plot many other related values, picking from a list including
charge, time, log I, and many more. Overlays are easily shown and
each overlaid plot may have a different color and point choice.
Overlays are added or removed in any order.
Text Exportation
The data acquired in an electrochemical experiment can be exported to a text file with a click of the mouse. In addition, a utility can be
activated to implement a real time export into Microsoft Excel®, allowing the full features of Excel plotting and data manipulation to be
LabView Capabilities
The BI-STAT can be supplied with LabView drivers for
a number of typical experiments. In addition, there is a
DLL library that can be obtained for use with the BISTAT. This will allow user implementation of software
that will control the BI-STAT and other equipment
needed to perform the necessary experiments.
Data Processing
The Bi-Stat software allows for on-line and off-line data
processing. The processing results will differ
depending on the type of experiment. Processing
allows for:
• Displaying log currents
• Cycle number can be made part of the data record
and can be plotted
• Charge can be calculated
• Integrals can be calculated
• Smoothing
• Splitting of large files
2 Channel Potentiostat
Model 636 Rotating Ring-Disk Electrode
When configured as a ring-disk rotator, the Model 636 can be paired with the Princeton Applied Research BI-STAT 2 channel
Potentiostat/Galvanostat. This combination can provide a powerful tool for investigations into kinetics and dissolution mechanisms.
Electrical connections to the electrode are made using carbon brushes. Consistent, reliable contact is assured by the use of two
brushes for each contact to the ring and disk. Carbon ring/glassy carbon disk is available.
RDE0018 Analytical Cell Kit
A special analytical cell kit is available with the rotating electrodes. This kit is RDE0018. All of the pieces in this kit will work for a
standard application. Please note that the kit contains two cell tops (RDE0010) and (K0066). The cell top RDE0010 has five holes:
four 14/20 standard taper ports to accept reference and counter electrodes, purge tube, etc., and one slightly larger hole to
accommodate the arbor from the rotating electrode. The Polarographic Cell Top (K0066) contains five 14/20 standard taper ports.
Both cell tops in combination with the K0060, K0062, and K0064 cell bottoms form a cell suitable for trace level analyses.
Ordering Information
Booster units are
2 Channel Multi-potentiostat/Galvanostat
Low Current Option Board
available for the BI-STAT. Please contact you local Sales Agent for information.
Specifications per Channel
Cell Control
Potential Measurement
Control Voltage Range: ±10 V adjustable between
–20 to +20 V.
Maximum Applied Current: ±400 mA continuous.
Applied Potential Resolution: 300 µV on 20 V dynamic range,
programmable down to 3 µV on 200 mV dynamic range.
Applied Current Resolution: 0.004% FSR*.
Applied Potential Accuracy (DC): <0.1% FSR.
Applied Current Accuracy (DC): <0.1% FSR.
with the 'p' low current option:
* <1% FSR on the 1 nA range
* <0.5% FSR on the 10 nA range
* <0.1% FSR on all other ranges
Bandwidth Control: 7 stability factors.
Rise Time: <2 µS (no load).
Slew Rate: >3 V/µS (no load).
Ranges: ±2.5 V, ±5 V, ±10 V plus ±10 V adjustable DC shift
Measured Potential Resolution: 0.0015% of the range, down
to 75 µV.
Acquisition Speed: 250,000 samples/second.
Measured Potential Accuracy (DC): <0.1% FSR.
Current Measurement
Ranges: ±10 µA, ±100 µA, ±1 mA, ±10 mA, ±100 mA, ±1 A,
with auto-ranging capability.
Maximum Resolution: 0.004% of the range, down to 760 pA.
Acquisition Speed: 200,000 samples/second.
Measured Current Accuracy (DC): <0.1% FSR.
Impedance: 1012 Ω in parallel with 20 pF — with the 'p' low
current option: 1014 Ω in parallel with 1 pF.
Bias Current: <5 pA. With Low Current Option: 50 ƒA.
Common Mode Rejection: >60 dB.
Additional Inputs / Outputs
2 General Purpose Analog Inputs: 16 bits resolution with
programmable range ±2.5 V, ±5 V, ±10 V.
1 External Input Trigger: TTL level.
1 External Output Trigger: TTL level.
1 External Security Input to Open Circuit: TTL level.
General Specifications
Computer Interface: Ethernet (TCP/IP).
Cell Cable Length: 1.5 m.
Power Requirements: 85–264 V AC, 47–440 Hz.
Specifications subject to change
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