Gas Detection

QGS SMD Sensor

QGS SMD Sensor

KEMET’s QGS thin film digital pyroelectric IR sensors for gas detection and concentration measurement combine high sensitivity with fast response times and high dynamic range to ensure rapid and accurate detection of target gases. These high quality sensors, in their small SMD package, integrate a digital, current mode read-out that enables lower IR-emitter duty cycles, thereby saving significantly on system level power consumption, while maintaining high SNR.

Industry standard I²C communication enables plug-and-play connectivity to microcontrollers and allows easy tuning and calibration. Programmable gain and filtering offer maximum flexibility in system design, and various optical filter options are also available. These sensors can be connected together in linear series to allow synchronized sampling across devices. Their long and maintenance-free operational lifetime makes them ideal for highly demanding automotive or medical applications.

 

  Part Number Filter Filter BW Use
USEQGSEAC82180 4.26 μm 180 nm CO2
USEQGSEACH4180 3.30 μm 160 nm CH4
USEQGSEAN8L180 5.30 μm 180 nm NO

 

Below flame sensors from the QFS series can also be used for gas detection or analysis, more details about these products available on the Flame Detection section.

 

  Part Number Filter Filter BW Use
USEQFSEA391180 3.91 μm 90 nm Reference
USEQFSEA22L1801 2.20 μm Long pass Broadband
USEQFSEA50L1801 5.00 μm Long pass Broadband
USEQFSEA4641802 4.64 μm 180 nm CO

1 Used with bespoke, customer or application-specific (narrowband) filters mounted externally.
2 Used as gas or active filter.

Features and Benefits Field of View Applications for Gas Detection
  • High sensitivity with fast response time
  • High dynamic range
  • Small SMD package
  • I2C communication
  • Digital output
  • Programmable gain and filtering
  • Various optical filter options
  • Integrated configurable amplifier, filter, and ADC
  • Low power consumption
Flame Sensor Field of View
  • Gas and gas flues
  • HVAC (refrigerant or CO2-driven ventilation system)
  • Industrial process and safety
  • Medical capnography and anesthesia
  • Handheld breath analysis and breath rate measurement
  • Automotive cabin air quality
  • Exhaust (CO2 content)
  • Home and building technology
  • Environmental monitoring (ambient CO2 level)
  • Pollution air quality in home, office and car (excessive CO2 level)
QGSM SMD Sensor Module

QGSM SMD Sensor Module

The Gas Sensor Modules consist of a breakout board, on which a SMD flame sensor is mounted, ideal for easy evaluation and quick prototype development. A ribbon cable for flexible connection to user’s hardware or backplane and control board is included.

Part Number Including Sensor Filter Filter BW Use
USEQGSM1C82100  USEQGSEAC82180 4.26 μm 180 nm CO2
USEQGSM1CH4100  USEQGSEACH4180 3.30 μm 160 nm CH4
USEQGSM1N8L100  USEQGSEAN8L180 5.30 μm 180 nm NO

Below flame sensor modules from the QFSM series can also be used for gas detection or analysis, more details about these products available on the Flame Detection section.

 

Part Number Including Sensor Filter Filter BW Use
USEQFSM1391100 USEQFSEA391180 3.91 μm 90 nm Reference
USEQFSM122L100 USEQFSEA22L180 1 2.20 μm Long pass Broadband
USEQFSM150L100 USEQFSEA50L180 1 5.00 μm Long Pass Broadband
USEQFSM1464100 USEQFSEA464180 2 4.64 μm 180 nm CO

 

1  Used with bespoke, customer or application-specific (narrowhead) filters mounted externally.
Used as gas or active filter.

Outfitted with all necessary components for the 1.8-3.6 V power supply of the device, all functionality of the sensor is routed out to a 10-pin 1.27mm pitch IDC connector on the back side of the 16 x 13.8 mm PCB. The build height including the socket is 9 mm. They provide up to 1 MHz Fast Mode+ I2C communication to configure the sensor and read data from it.

 

  Pin Symbol Type
1 Vsupply Power supply
2 Unassigned
3 SCL (I2C) Digital in/out
4 SDA (I2C) Digital in/out
5 CS Digital in
6 INT Digital out
7 SYNC Digital in/out
8 CLK Digital in/out
9 Unassigned
10 GND Ground

There is a chip select/enable pin and an interrupt output available. The CLK/SYNC pins can be used to feed an external clock signal in to the board or, alternatively, distribute the clock signal of one board to several other boards, thereby creating a synchronized “network” of sensors.

Part Number Use Type
USEQCSK0000000 Control board for modules
  • Preassembled backplane PCB
  • USB communications cable
  • Ribbon cable, optional use (up to 4)

USEQCSK0000000 can flexibly host up to four modules. With no hardware design work required, a combination of this backplane board and any of the attached SMD sensors can produce infrared sensor signal measurements out of the box in the early evaluation and design stages. This control board is provided with PC software allowing the user to configure and read out each of the SMD sensors connected. The sensor data is visualised in real time on a scope plot in the user interface. A csv file capture facility records the digital signals from the sensors for further processing by the user.

QGC Analog Sensor

QGC Analog Sensor

KEMET’s QGC pyroelectric gas sensors can be reduced in physical size and still provide high sensitivity with fast frequency operation, enabling this highly stable 1 to 4 element sensor in a TO39 package. The sensor element is built into a low noise circuit that has an internal CMOS operational amplifier with a 10 GΩ feedback resistor outputting a voltage signal centered around half the supply rail.

Single Channel Sensor Part Number Cut On Wavelength CWL / (HPB) Use
USEQGCCAREF100 3.91 μm / (90 nm) Reference
USEQGCCAC82L00 4.26 μm / (180 nm) CO2
USEQGCCAC82S00 4.43 μm / (60 nm) CO2 (Special)
USEQGCCAC82N00 4.30 μm / (110 nm) CO2 (Narrow)
USEQGCCAC8L100 4.64 μm / (180 nm) CO
USEQGCCAC8N100 4.64 μm / (90 nm) CO (Narrow)
USEQGCCACH4100 3.30 μm / (160 nm) CH4
USEQGCCAN8L100 5.30 μm / (180 nm) NO
USEQGCCAHC1100 3.375 μm / (190 nm) H-C
USEQGCCAS82100 7.30 μm / (200 nm) SO2
USEQGCCAR12100 10.35 μm / (190 nm) Refrigerant R12 (Freon)
USEQGCCA50L100 5.00 μm Long Pass Broadband for bespoke filters
Dual Channel Sensor Part Number Channel 1
Cut On Wavelength CWL / (HPB)
Channel 2
Cut On Wavelength CWL / (HPB)
Use
USEQGCDAC82L00 3.91 μm / (90 nm) 4.26 μm / (180 nm) CO2
USEQGCDAC82S00 3.91 μm / (90 nm) 4.43 μm / (60 nm) CO2 (Special)
USEQGCDAC82N00 3.91 μm / (90 nm) 4.30 μm / (110 nm) CO2 (Narrow)
USEQGCDAC82M00 3.70 μm / (110 nm) 4.26 μm / (180 nm) CO2 (Medical)
USEQGCDAC82100 4.90 μm / (130 nm) 4.26 μm / (180 nm) CO2 (Medical)
USEQGCDAC8L100 3.91 μm / (90 nm) 4.64 μm / (180 nm) CO
USEQGCDAC8N100 3.91 μm / (90 nm) 4.64 μm / (90 nm) CO (Narrow)
USEQGCDACH4100 3.91 μm / (90 nm) 3.30 μm / (160 nm) CH4
USEQGCDAN8L100 3.91 μm / (90 nm) 5.30 μm / (180 nm) NO
USEQGCDAHC1100 3.91 μm / (90 nm) 3.33 μm / (160 nm) H-C (1)
USEQGCDAHC2100 3.91 μm / (90 nm) 3.375 μm / (190 nm) H-C (2)
USEQGCDAS82100 3.91 μm / (90 nm) 7.30 μm / (200 nm) SO2
USEQGCDAR12100 8.94 μm / (225 nm) 10.36 μm / (190 nm) Refrigerant R12 (Freon)
USEQGCDA50L100 5.00 μm Long Pass 5.00 μm Long Pass Broadband for bespoke filters
USEQGCDAANA100 8.44 μm / (205 nm) 4.26 μm / (180 nm) Anesthesia
USEQGCDAN82100 3.91 μm / (90 nm) 6.20 μm / (200 nm) NO2
USEQGCDASF6100 3.91 μm / (90 nm) 10.6 μm / (240 nm) SF6, Ethylene
Quad Channel Sensor Part Number Channel 1
Cut On Wavelength CWL / (HPB)
Channel 2
Cut On Wavelength CWL / (HPB)
Channel 3
Cut On Wavelength CWL / (HPB)
Channel 4
Cut On Wavelength CWL / (HPB)
Use
USEQGCQAC82H00 3.38 μm / (190 nm) 3.91 μm / (90 nm) 4.26 μm / (180 nm) 4.64 μm / (180 nm) HC, CO, CO2
USEQGCQAAN1100 3.90 μm / (200 nm) 3.90 μm / (200 nm) 4.26 μm / (180 nm) 8.416 μm / (180 nm) Anesthesia (1)
USEQFCSA435100 8.75 μm / (200 nm) 9.62 μm / (230 nm) 12.25 μm / (210 nm) 8.55 μm / (180 nm) Anesthesia (2)
USEQFCSA448100 4.26 μm / (180 nm) 4.64 μm / (180 nm) 3.30 μm / (160 nm) 3.91 μm / (90 nm) Exhaust, Environmental
Features and Benefits Applications for Gas Detection
  • Fast, stable response over a wide operating frequency range
  • 1, 2, or 4 sensor elements in one package
  • Rapid recovery from thermal and electrical shock, <1 second downtime
  • TO39 package
  • Analog output
  • Integrated operational amplifier
  • Gas and gas flues
  • HVAC (refrigerant or CO2-driven ventilation system)
  • Industrial process and safety
  • Medical capnography and anesthesia
  • Handheld breath analysis and breath rate measurement
  • Breath actuated dispenser
  • Automotive cabin air quality
  • Exhaust (CO2 content)
  • Home and building technology
  • Environmental monitoring (ambient CO2 level)
  • Pollution air quality in home, office, and car (excessive CO2 level)
Product Listing

Product Listing

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QGS/QGC Evaluation Kit

QGS/QGC Evaluation Kit

To allow for further in-depth testing of these gas sensing and detection solutions, KEMET is proposing 2 evaluation kits, a digital one and an analog one. 

The purpose of the digital SMD CO2 Gas Sensing Evaluation Kit is to enable engineers and technicians to carry out a simple and effective evaluation of the QGS SMD sensors, and to capture measured data to a PC through the KEMET Gas Sensing Evaluation Tool software.



Part Number Use Includes
USEQGSK3000000 SMD CO2 Gas Sensing Evaluation Kit
  • PCB with STM32F303K8T6 microcontoroller
  • USEQFSEA391180, 1 px 3.91 µm / 90 nm
  • USEQGSEAC82180, 1 px 4.26 µm / 180 nm
  • Emitter drive PCB, with TO39 IR emitter
  • 3D printed gas cell
  • Breathing tubes
  • 9 VDC power supply
  • USB communications cable
 

The analog TO CO2 Gas Sensing Evaluation kit is to enable the users to carry out a simple and effective demonstration of the QGC two channel CO2 sensor, as well as to provide a flexible platform to start evaluation and design work with all others QGC TO-39 packaged gas sensors.

  Part Number Use Includes
USEQGCK5000000 Analog TO CO2 Gas Sensing Evaluation Kit
  • PCB with C8051F350 microcontroller and ADC
  • USEQGCDAC82L00, dual channel CO2 sensor
  • Emitter drive PCB, with TO39 IR emitter, reflector and sapphire window
  • Brass gas cell 1
  • 9 VDC power supply
  • USB communications cable

1 Not gas sealed, please consider safety if used with toxic gases.