Sensit Wearable

Potentiostat for wearable biosensors

  • Accelerate the development of your wearable sensor
  • Works wireless and autonomous, battery powered
  • Measure up to two different analytes using two working electrodes
  • Use with PSTrace software for Windows
  • Smooth start with the development kit
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Description

The Sensit Wearable reduces the time-to-market for new electrochemistry-based wearable sensors. Wearable, flexible electrochemical sensors, for instance integrated on the epidermis, can be used to measure non-invasively metabolites and electrolytes for various biomedical applications.

Possible applications

  • Continuous Glucose Monitoring
  • Sweat analysis for athletes
  • Molecular biomarkers

Techniques and software

The Sensit Wearable supports most common electrochemical techniques, including Cyclic Voltammetry, Square Wave Voltammetry and Impedance Spectroscopy (FRA/EIS). The Sensit Wearable runs autonomously for hours up to weeks, executing a MethodSCRIPT while powered from a battery, and saving data to onboard storage. Control the Sensit Wearable wirelessly or with USB using the Android app PStouch (available on my.palmsens.com), or using our PC software PSTrace

Key electrochemical specifications

The Sensit Wearable is built around the EmStat Pico Core potentiostat chip.

  • Capable of EIS up to 200 kHz
  • Potential range -1.7 to +2 V
  • Current ranges 100 nA – 5 mA (max ±3 mA)

Kit contents

The Sensit Wearable comes with:

  • Sensit Wearable reader
  • Evaluation board with mounting bracket, including
  • Cell cable
  • Crocodile clips
  • Accessories for various wearing options
  • Two example mounting brackets
  • Velcro strap with mounting bracket and universal SPE connector
  • Quick Start document
  • PSTrace software for Windows and PStouch software for Android

Techniques

Voltammetric techniques

Linear Sweep Voltammetry (LSV)
In Linear Sweep Voltammetry a potential scan is performed from the begin potential, to the end potential. The voltage during the scan increases with small potential steps. Continue reading
Cyclic Voltammetry (CV)
Cyclic voltammetry is a known method of demonstrating the presence of a substance in a given liquid by drawing a graph with a characteristic wavy line. Continue reading

Pulsed techniques

Differential Pulse Voltammetry (DPV)
In Differential Pulse Voltammetry a potential scan is made using pulses with a constant amplitude of E pulse superimposed on the dc-potential. Continue reading
Square Wave Voltammetry (SWV)
Square Wave Voltammetry is a special version of Differential Pulse Voltammetry is, where the pulse time is equal to half the interval time. Continue reading
Normal Pulse Voltammetry (NPV)
In Normal Pulse Voltammetry (NPV) a potential scan is made by making constantly larger potential steps of pulse. Continue reading

Amperometric techniques

Chronoamperometry (CA)
The instrument applies a constant dc-potential and the current is measured with constant interval times. Continue reading
Chronocoulometry (CC)
Chronocoulometry is an electrochemical technique during which a potential is set. Continue reading
MultiStep Amperometry (MA)
MultiStep Amperometry (MA) is an electrochemical technique which simply allows the user to specify the number of potential steps they want to apply and how long each step should last. Continue reading
Pulsed Amperometric Detection (PAD)
With Pulsed Amperometric Detection a series of pulses (pulse profile) is periodically repeated. Pulsed Amperometric Detection can be used when higher sensitivity is required. Continue reading

Galvanostatic techniques

Open Circuit Potentiometry (OCP)
Open Circuit Potential (OCP) is the potential where no current is flowing, because the circuit is open. Continue reading

Electrochemical Impedance spectroscopy

Electrochemical Impedance spectroscopy (EIS)
Electrochemical Impedance Spectroscopy (EIS) is an electrochemical technique to measure the impedance of a system in dependence of the AC potentials frequency. Continue reading
Potential scan (IMPE)
Fixed potential
Time scan (IMPT)

Other

Mixed Mode (MM)
Mixed Mode is a flexible technique that allows for switching between potentiostatic, galvanostatic, and open circuit measurements during a single run. Continue reading
Missing a technique? See cross-reference list

Specifications

General
Full
dc-potential range
The maximum potential difference, that can be applied between WE and RE.
-1.7 to +2 V
Dynamic
dc-potential range
The maximum potential difference, that can be applied between WE and RE.
 [1]
2.2 V
Compliance voltage -2.0 to +2.3 V [2]
Maximum current ± 3 mA
Max. data acquisition rate (datapoints/s) 1000
Supports FRA/EIS Yes
[1]  The dynamic range is the range that can be covered during a single scan within the full potential range. For example; a linear scan can start at -1.5 V and end at 1.1 V or vice versa, covering 2.6 V dynamic range.
[2] The
compliance voltage
The compliance voltage is the maximum voltage that can be applied between the working and counter electrode. Another name could be the maximum cell potential. Continue reading
is the maximum potential between Working and Counter electrode and depends on the selected mode.
Potentiostat (controlled potential mode)
Channels

1 channel (2x WE, 1x RE, 1x CE)

Applied dc-potential resolution 537 µV
Applied potential accuracy < 0.2%
Current ranges 100 nA to 5 mA (10 or 12 ranges, depending on the mode)
Current resolution 0.006% of selected current range
(5.5 pA on 100 nA range)
Current accuracy

< 0.5 % of current ±0.1% of range

Measured potential resolution (for OCP) 56 uV (for OCP)
FRA / EIS (impedance measurements)
Frequency range 0.016 Hz to 200 kHz
Ac-amplitude range 1 mV to 0.25 V rms, or 0.708 V p-p
Electrometer
Electrometer amplifier input > 1 TΩ // 10 pF
Bandwidth  250 kHz
Other
Power USB-C and Battery 
Communication USB-C and Wireless communication BLE 5.0
Storage 14 MB for storing >450k datapoints
Size 35 x 35 x 12 mm (including the mounting bracket)
Weight 10 g
Battery

Rechargeable 50 mAh / 0.2 Wh.

Battery life 2 hours up to weeks, depending on the MethodSCRIPT. See power consumption below.

Auxiliary port 1 Auxiliary pin, used by default for internal NTC temperature measurement.
Sensor connector Via 6 spring-pin mounting bracket, or connect a regular SPE using the sensor break-out board
Operation temperature range 0 °C to +40  °C
Power consumption
off 0.1 mW 75 days
idle or measuring 92 mW 2 hours
sleep with Bluetooth connected 1 mW 7.5 days
sleep without Bluetooth connected 0.3 mW 25 days
sleep with 10 mW bias potential applied on WE1 4.44 mW 40 hours
EIS Accuracy Contour Plot

Software

PSTrace

PSTrace is designed to be productive immediately after installation, without going through a long learning period.  The software allows for getting the most out of the Sensit Wearable with only a few click. Besides controlling the Sensit Wearable directly via USB or Bluetooth, it allows for generating scripts to run on the Sensit Wearable which include:

  • Repeating measurements at fixed intervals
  • Storing measurement data on the Sensit Wearable internal storage
  • Going into low-power hibernation mode
  • Waking up after time period or tapping on the Sensit Wearable

After measurement data has been collected with the Sensit Wearable running autonomously, just connect the Sensit Wearable to your PC or laptop and load it into PSTrace for further analysis.

More information about PSTrace
PSTrace Method Editor

PStouch

PStouch is an app for Android devices compatible with all PalmSens, EmStat and Sensit potentiostats. The app connects to your potentiostat via USB (depending on the Android device) or via Bluetooth.

PStouch features include:

  • Setting up and running measurements
  • All files compatible with PSTrace
  • Analysing and manipulating peaks
  • Sharing data directly via e-mail, Dropbox, or any other file sharing service

 

Get it on MyPalmSens
More information about PStouch

MethodSCRIPT™ Communications Protocol

The Sensit Wearable works with MethodSCRIPT™, giving you full control over your potentiostat. The simple script language is parsed on-board, which means no DLLs or other type of code libraries are required. MethodSCRIPT™ allows for running all supported electrochemical techniques, making it easy to combine different measurements and other tasks. 

MethodSCRIPT can be generated, edited, and executed in PSTrace.

MethodSCRIPT features includes:

  • (Nested) loops and conditional logic support
  • User code during a measurement iteration
  • Exact timing control
  • Entering or waking from hibernation mode
  • Logging results to internal storage or external SD card
  • Simple math operations on variables (add, sub, mul, div)
  • Data smoothing and peak detection
  • and many more…
Learn about MethodSCRIPT

Software Development Kits

PalmSens provides several Software Development Kits (SDKs) to help developers create custom software to control their potentiostat. Each SDK comes with documentation and examples that shows how to use the libraries.

SDKs are available for:

  • .NET (WinForms, WPF and Xamarin for Android)
  • Python
  • LabVIEW
  • Matlab
More information about SDKs for .NET

Patches

Who can develop a wearable patch?

PalmSens has partnered with two companies that help with custom patch development:

   Innovosens AB | LinkedIn

There is demonstration patch from each of these companies to measure the impedance of sweat on your skin. Depending on the availability, the Development Kit will include one of these demonstration patches. Many other applications for a custom patch are possible.

Compatibility

Is the Sensit Series immediately suitable for my application?

My sensor fits the connector.
The required electrochemical technique for my application is supported.
The analyte conductivity does not require a compliance voltage of 2/2.3 V.

Downloads

Documentation (7)

Name Last updated
Screentec Wearable Patch Screentec can make bespoke wearable solutions. Read more about this and the example patch in this brochure. 28-03-25
Sensit Wearable Communication Protocol v1.5 Initial communication with the Sensit Wearable is always done using this online communication. 26-03-25
MethodSCRIPT v1.7 The MethodSCRIPT scripting language is designed to improve the flexibility of the PalmSens potentiostat and galvanostat devices for OEM users. It allows users to start measurements with arguments that are similar to the arguments in PSTrace. PalmSens provides libraries and examples for handling low level communication and generating scripts for MethodSCRIPT devices such as the EmStat Pico and EmStat4. 26-03-25
Sensit Wearable Brochure Brochure of the Sensit Wearable with supported techniques, specifications and more details. 20-02-25
MethodSCRIPT v1.6 The MethodSCRIPT scripting language is designed to improve the flexibility of the PalmSens potentiostat and galvanostat devices for users. It allows users to start measurements with arguments that are similar to the arguments in PSTrace. 28-08-24
Sensit Wearable Communication Protocol 1.4 Initial communication with the Sensit Wearable is always done using this online communication. 28-08-24
Sensit Wearable Manual Manual on how to use the Sensit Wearable and the Sensit Wearable Development Kit. 08-07-24

Software (4)

Name Last updated
Sensit Wearable Firmware v1.5 Firmware for the Sensit Wearable. 26-03-25
PStouch for Sensit Wearable PStouch is a free app for Android devices that can be used with PalmSens, Sensit and EmStat potentiostats. PStouch works with your potentiostat via USB or via Bluetooth. 11-09-24
PSTrace PC software for all single channel instruments PSTrace software is shipped as standard with all single channel and multiplexed instruments. The software provides support for all techniques and device functionalities. 08-07-24
MethodSCRIPT code examples MethodSCRIPT code examples include:
- MethodSCRIPTExample_C
- MethodSCRIPTExample_C_Linux
- MethodSCRIPTExample_C#
- MethodSCRIPTExample_Arduino
- MethodSCRIPTExample_Python
- MethodSCRIPTExample_iOS
- MethodSCRIPTExample_Android
Every code example comes with a "Getting Started" document.
07-07-24

Other (3)

Name Last updated
Sensit Wearable Adapter – STEP file and PDF PDF and STEP file of the Sensit Wearable Adapter. The PDF will show you the layer stack and traces on the PCB of the adapter. The STEP file is a 3D file. 10-12-24
Mounting Bracket STEP files STEP files of the Sensit Wearable mounting bracket. Can be used for reference or for 3D printing. 27-08-24
Mounting Bracket Technical Drawing Drawing of mounting brackets, to be put on a custom electrochemical biosensor. 03-07-24
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