Yageo KEMET USEQGCK5000000 User manual

TO CO2 Gas Sensing Evaluation Kit (Analog) USEQGCK5000000
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 1
TO Pyroelectric Infrared
CO2Gas Sensing Evaluation Kit
USEQGCK5000000
User Guide
Rev. 4.3
MAR 2022

TO CO2 Gas Sensing Evaluation Kit (Analog) USEQGCK5000000
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 2
TABLE OF CONTENTS
1 INTRODUCTION ........................................................................................................... 3
2 GETTING STARTED ..................................................................................................... 3
2.1 Kit Contents............................................................................................................3
2.2 Minimum System Requirements .............................................................................3
3 INSTALLATION ............................................................................................................. 4
3.1 Installing the KEMET Gas Sensing Evaluation Tool Software.................................4
3.2 Connecting the TO Gas Sensing Evaluation Kit......................................................4
4 SOFTWARE USER GUIDE............................................................................................ 5
4.1 Starting the Software ..............................................................................................5
4.2 Connecting Software to the Data Capture Board ....................................................6
4.3 Data Capture Board Control....................................................................................7
4.3.1 Data Capture Settings ................................................................................7
4.3.2 RMS Values................................................................................................8
4.3.3 RMS Width Value .......................................................................................8
4.4 Viewing Live Data –Oscilloscope Window..............................................................9
4.5 Saving Data to CSV (Comma Separated Value) File..................................................11
5 CONCENTRATION VIEW............................................................................................ 12
5.1 Signal Processing.................................................................................................14
6 PC TO PCB COMMUNICATIONS................................................................................ 14
6.1 Commands Description.........................................................................................15
6.2 Sampling and Signal Processing for KEMET TO Sensors.....................................15
7 EMITTER VOLTAGE SETTING................................................................................... 17
7.1 Saturation of Signal...............................................................................................17
7.2 Method..................................................................................................................18

TO CO2 Gas Sensing Evaluation Kit (Analog) USEQGCK5000000
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 3
1 INTRODUCTION
This document describes the KEMET demonstrator kit that enables simple and efficient data
visualisation and capture from KEMET TO-39 packaged sensor components. These high-
performance thin film pyroelectric sensor products are typically used in NDIR gas sensing,
process analytical measurement, IR spectroscopy and medical diagnostic applications.
The purpose of the kit is to enable the users to carry out a simple and effective demonstration
of KEMET two channelCO2 sensor, as well asto provide a flexible platform to start evaluation
and design work with all KEMET TO-39 packaged gas sensors. The software includes facilities
to capture measured data and visualise and record it on a Windows PC. The kit is based on
the Silicon Labs C8051F350 microcontroller with a high precision A-D converter and
programmable gain amplifier. It is capable of sample rates up to 333 Hz when sampling from
a single channel (allows for up to 4 multiplexed signals and ¼ the sample rate).
2 GETTING STARTED
Figure 1 –TO CO2Gas Sensing Evaluation Kit USEQGCK5000000
2.1 Kit Contents
1. KEMET PCB with C8051F350 microcontroller and ADC
2. USEQGCDAC82L00 dual channel CO2 sensor
3. Emitter driver PCB, with KEMET TO-39 IR emitter, reflector and sapphire window
4. Brass gas cell (not gas sealed, please consider safety if used with toxic gases)
5. 9 VDC power supply
6. Micro USB cable
7. KEMET Gas Sensing Evaluation Tool (Analog) software
click here for downloading the software
2.2 Minimum System Requirements
1. Microsoft® Windows PC
2. 2 GB of RAM

TO CO2 Gas Sensing Evaluation Kit (Analog) USEQGCK5000000
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 4
3. 450 MB of available hard-disk space for installation, additional free space required for
storing CSV files
4. 1,024x768 display (1,280x1,024 recommended)
5. Local administrative rights to install device drivers
6. .NET Framework 4.5
7. 1 free USB port
3 INSTALLATION
3.1 Installing the KEMET Gas Sensing Evaluation Tool Software
From the software package available to download here, select the setup.exe file that has this
icon. This will start the installation process.
Figure 2 –Installer Screen
Follow the on screen instructions and enter the information required.
As part of the installation process a check will take place to see if .NET Framework 4.5 is
present. If not, it can be installed as part of the setup routine or alternatively the setup routine
can be cancelled and the .NET framework 4.5 can be downloaded from Microsoft’s website.
The framework can take a while to install but the software requires it.
3.2 Connecting the TO Gas Sensing Evaluation Kit
1. Connect the power supply provided to the KEMET PCB.
2. Connect the USB cable to the kit and Windows PC.
a. You may see a message suggesting you are required to install a device
driver. Follow the on-screen instructions and download a driver from Windows
Update.
Your kit is now installed and ready to use.

TO CO2 Gas Sensing Evaluation Kit (Analog) USEQGCK5000000
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 5
4 SOFTWARE USER GUIDE
The KEMET Gas Sensing Evaluation Tool Data Capture software runs on Microsoft Windows
PCs and communicates with the Evaluation Kit USEQGCK5000000’s PCB, which enables
easy testing of KEMET TO packaged sensors. The software provides an interface to the
analog circuits and A-D (Analog to Digital) converter, which are provided by the Silicon Labs
C8051F350. Additional signal processing algorithms to filter and analyze sensor output for
NDIR gas sensing are provided.
4.1 Starting the Software
To start the software, select the following from the windows start button in your task bar.
This will open up the KEMET sensor data capture main screen as shown below.
Figure 3 –TO Gas Sensing Evaluation Tool Main Application Window

TO CO2 Gas Sensing Evaluation Kit (Analog) USEQGCK5000000
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 6
4.2 Connecting Software to the Data Capture Board
To connect to the data capture board make sure the board is powered and connected to the
PC through the USB cable.
From the menu bar select the Device option and then COMXX : Gas Sensor v3.1 VB as
shown below.
Figure 4 –Detector Connection
If the device does not show up, then click Rescan Ports.
Select the device. If the device does not show up, then unplug the USB cable and reconnect
then repeat the steps above.
Figure 5 –Main Application Window
If the data capture board is connected to the required com port, the status bar at the bottom
of the main display will show the message “Connected on COMXX” in the bottom right corner
of the window, and the Data Capture Board firmware version will be shown in the bottom left
corner, as shown in Figure .

TO CO2 Gas Sensing Evaluation Kit (Analog) USEQGCK5000000
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 7
4.3 Data Capture Board Control
The current settings used on the data capture board are displayed and the root mean square
(RMS) values update at a rate depending on filter width and emitter frequency.
Figure 6 –Data Capture Board Control Window
If there is any doubt about the settings displayed matching the board, there is a refresh button
which reads back all the settings and updates on the application window. There is also the
option to pause the stream of data. Note that this only stops the PC reading the stream and
does not stop the actual data capture boards data stream.
4.3.1 Data Capture Settings
It is possible to change some of the settings on the data capture board and also the filter
calculations through the interface. The settings from the drop-down lists update the board
immediately once the change takes place and the settings in the boxes update when enter is
pressed or leaving to a different control as long as the value is valid. If the value is invalid or
out of range, an error message is displayed and the text box is cleared.
The settings the user can access are described below:
Number of Channels: The board is capable of sampling inputs from up to 4 different
channels. The drop-down list allows the user to select the number of channels required. The
higher the number of channels selected, the lower the frame rate will be.
Gain: The C8051F350 chip provides a programmable gain amplifier making it possible to
select a gain for each channel independently from 1 to 128 times.

TO CO2 Gas Sensing Evaluation Kit (Analog) USEQGCK5000000
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 8
Emitter Frequency (Hz): The frequency with which the board pulses the IR emitter can be
set between 2 Hz and 30 Hz.
Emitter Duty Cycle: This can be set with two options, either 25% or 50% duty cycle.
RMS Width: The filter width of the RMS can be increased by a number of periods from 1 up
to 1,000. Anything outof this range will be flagged as out of range. The higher values will result
in slower response time.
4.3.2 RMS Values
This section displays the RMS (root mean square) output of each sensor channel calculated
to the specified filter widths.
Figure 7 –RMS Result Section
The values are updated when the calculations are complete for each set of data, with a rate
that should match the displayed response rate. The response rate is determined by the filter
width over the emitter frequency and is displayed in seconds. Inactive channels simply show
a value of 0.
4.3.3 RMS Width Value
In order to choose the best RMS width, the following parameters need to be known about the
set-up that you are using.
1. Sample frequency
2. Emitter frequency
3. Number of emitter periods to be used for RMS window
In order to ensure stability of the RMS values, the RMS window should be an integer multiple
of the number of samples taken during one emitter period.
First take the sample frequency and emitter frequency and determine the periods of each.
𝑆𝑎𝑚𝑝𝑙𝑒 𝑝𝑒𝑟𝑖𝑜𝑑 = 1
𝑆𝑎𝑚𝑝𝑙𝑒 𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦
𝐸𝑚𝑖𝑡𝑡𝑒𝑟 𝑝𝑒𝑟𝑖𝑜𝑑 = 1
𝐸𝑚𝑖𝑡𝑡𝑒𝑟 𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦
From this the number of samples that should be used for the RMS window is
𝑅𝑀𝑆 𝑤𝑖𝑑𝑡ℎ = 𝐸𝑚𝑖𝑡𝑡𝑒𝑟 𝑝𝑒𝑟𝑖𝑜𝑑
𝑆𝑎𝑚𝑝𝑙𝑒 𝑝𝑒𝑟𝑖𝑜𝑑 ∗ 𝑛

TO CO2 Gas Sensing Evaluation Kit (Analog) USEQGCK5000000
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 9
for some integer ‘n’. This ensures that the RMS is taking one period or a multiple of periods
effectively. Taking values of ‘n’that are not integers will produce a varying output in terms of
RMS due to sampling more or less than one complete waveform, as shown below.
Figure 8 –Standard Deviation of Raw Signal –10 Hz Emitter Pulsing and 80 Hz Sample Frequency
The above plots show an example of the KEMET Gas Sensing Evaluation Kit when running
at a sample frequency of approximately 80 Hz. The right hand side shows the effect of taking
the window width to be 8 samples –10 Hz emitter frequency gives 8 samples per emitter
period. If we change this to 7 instead then we are looking at a different part of the waveform
each time and it introduces the noise seen on the left plot which is simply an artefact of the
data processing.
4.4 Viewing Live Data –Oscilloscope Window
While the software isconnected to a data capture board, it is possible to view the data sampled
in real time. Virtual oscilloscopes are provided for each channel and can be shown or hidden
by selecting Oscilloscope Full View or Oscilloscopes Normal View respectively from
Options on the menu bar.
Figure 9 –View Options
The oscilloscope window has several features which emulate a basic oscilloscope for viewing
live sampled data. It can be adjusted to display the desired range on both the y-axis
(Amplitude) and the x-axis (Time Domain).
The number of oscilloscope windows displayed is equivalent to the number of channels
selected and will change every time the number of active channels changes.

TO CO2 Gas Sensing Evaluation Kit (Analog) USEQGCK5000000
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com 10
Figure 10 –Oscilloscope Window - Normal View
The oscilloscope value display range can be adjusted by two different methods:
1. By entering the maximum and minimum values in the text box at the end of each axis.
When entering the values, the color of the box will change to signify that the value in
the box is not currently being used for the display. After setting the text value to the
desired number, press Enter and the display will update (the text box changes back to
white to signify that the value in the box is being used). Ifthe new value is not accepted
(for example, if the minimum value is greater than the maximum value, or text has
been entered instead of a number), then the previous value will automatically re-load.
2. By using the mouse.
•The scroll bars along both axes canbe used to move thedisplay position and tozoom
in or out.
-Moving the position is achieved by moving the scrollbar position.
-Scaling is changed by entering a new set of values for the upper and lower limits
of the graphing area. Click on the axis value and type the new value, pressing
enter causes the change to take effect.
•The viewing offset can also be adjusted in both x and y directions by holding down
the right mouse button when over the viewing area and dragging the mouse (up,
down, left or right).
The Properties Option, which is accessed by right clicking on the scopes graphing area,
allows the user to enable or disable the horizontal grid lines and also set the spacing in A-D
counts.