CO₂ sensors

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Carbon Dioxide (CO2) sensors enable the development of smart devices that enhance comfort, health, and energy efficiency in a variety of HVAC, consumer and medical applications. Sensirion offers a broad portfolio of CO2 sensors based on multiple measurement principles to meet diverse needs. Our NDIR sensors are designed for high-accuracy and long-term monitoring. Our photoacoustic sensors enable ultra-sensitive CO2 detection in compact devices. Our thermal conductivity sensors are built for fast-response and cost-effective applications. By combining these technologies, Sensirion provides versatile and reliable CO₂ sensing solutions suitable for indoor air-quality monitoring, smart home integration, and medical applications as well as wearable devices. Explore our CO₂ sensor portfolio to find the perfect solution for your application.

Filters
  • Series

    • SCD30

      1

    • SCD4x

      5

    • SCD4x Gadget

      1

    • SEK-SCDxx

      2

    • SEK-SensorBridge

      1

    • SEK-STC31

      2

    • SEK-STCC4

      1

    • STC31

      2

    • STCC4

      1

    • ASP1400

      0

    • EK-F5x

      0

    • EK-LD20xx

      0

    • EK-LPG10

      0

    • EK-Px

      0

    • EK-SLF3x

      0

    • EK-SLx

      0

    • ESS

      0

    • LD20

      0

    • LG01

      0

    • LG16

      0

    • LPG10

      0

    • LS32-1500

      0

    • SCC1

      0

    • SCC30-DB

      0

    • SDP1xxx

      0

    • SDP3x

      0

    • SDP5xx

      0

    • SDP6xx

      0

    • SDP8xx

      0

    • SDPxxx cap

      0

    • SEK-SDP

      0

    • SEK-SEN5x

      0

    • SEK-SEN6x

      0

    • SEK-SFAxx

      0

    • SEK-SFMxxxx

      0

    • SEK-SHTxx

      0

    • SEK-SPSxx

      0

    • SEK-STS4x

      0

    • SEK-SVMxx

      0

    • SEN5x

      0

    • SEN6x

      0

    • SENSEVAL-SCB4XV1

      0

    • SENSEVAL-SHT4XV1

      0

    • SFA30

      0

    • SFA40

      0

    • SFC3x00

      0

    • SFC4x00

      0

    • SFC5300

      0

    • SFC5400

      0

    • SFC5500

      0

    • SFC6000

      0

    • SFM3xxx

      0

    • SFM3xxx-AW/D

      0

    • SFM4xxx

      0

    • SFM5xxx

      0

    • SFM6000-OEM

      0

    • SFx filter cap

      0

    • SGD43S-M3-Sx

      0

    • SGM53xx

      0

    • SGM63xx

      0

    • SGM64xx

      0

    • SGP30

      0

    • SGP4x

      0

    • SGPC3

      0

    • SHT1x

      0

    • SHT2x

      0

    • SHT31 Smart Gadget

      0

    • SHT3x

      0

    • SHT43 DemoBoard

      0

    • SHT4x

      0

    • SHT4xA

      0

    • SHT4xI

      0

    • SHT4x Smart Gadget

      0

    • SHT7x

      0

    • SHT85

      0

    • SHTCx

      0

    • SHTWx

      0

    • SLD3P

      0

    • SLF3S

      0

    • SLF3x

      0

    • SLG

      0

    • SLI

      0

    • SLQ-QT105

      0

    • SLQ-QT500

      0

    • SLS-1500

      0

    • SPS30

      0

    • STC42x

      0

    • STS2x

      0

    • STS3x

      0

    • STS4x

      0

    • STS4xA

      0

    • SVM30

      0
  • Class

    • Evaluation kit

      7

    • Reference design

      1

    • Sensor

      8

    • Accessory

      0

    • Development board

      0
  • Product status

    • New

      6

    • Active

      7

    • Not recommended for new designs

      1

    • Obsolete

      2

    • Upcoming

      0

    • Last time buy

      0
  • Interface

    • I²C

      6

    • PWM

      1

    • ModBus

      1

    • Sensibus

      0

    • SDM

      0

    • UART

      0

    • RS232

      0

    • RS485

      0

    • Switch

      0

    • Device net

      0

    • IO link

      0

    • Analog voltage

      0

    • Analog current

      0
SEN69C
Upcoming

SEN69C

Sensing platform for PM, RH/T, VOC, NOx, CO2 and HCHO measurements

Mass concentration precision
±10 %
Mass concentration range
0 - 1000 μg/m³
Particle size range
PM1.0, PM2.5, PM4 and PM10
Lifetime
> 10 years
Supply voltage
3.15 - 3.45 V
Average supply current
80000 uA
Interfaces
I²C
  • Sensor
  • Particulate matter sensors
STCC4
New

STCC4

CO₂ sensor with unmatched form factor for indoor air quality applications

Specified CO₂ Measurement Range
400 - 5000 ppm
Size (LxWxH)
4 x 3 x 1.2 mm
Accuracy
±100.0 ppm ±10.0 %m.v.
Response time(τ63%)
20 s
Supply voltage
2.7 - 5.5 V
Average supply current
950 uA
Operating temperature range [°C]
10 - 40 °C
  • Sensor
  • CO₂ sensors
STC31-C
New

STC31-C

CO₂ accuracy of ±(0.2 - 2.0 vol%) @0-100 vol%

Specified CO₂ Measurement Range
0 - 100 vol %
Size (LxWxH)
3.5 x 3 x 1 mm
Accuracy
±0.2 vol % ±2.0 %m.v.
Response time(τ63%)
0.5 s
Supply voltage
2.7 - 5.5 V
Average supply current
50 uA
Operating temperature range [°C]
-
  • Sensor
  • CO₂ sensors
SCD43
New

SCD43

High CO₂ accuracy with comprehensive building standard compatibility

Specified CO₂ Measurement Range
400 - 5000 ppm
Size (LxWxH)
10.1 x 10.1 x 6.5 mm
Accuracy
±30.0 ppm ±3.0 %m.v.
Response time(τ63%)
60 s
Supply voltage
2.4 - 5.5 V
Average supply current
15 mA
Operating temperature range [°C]
-10 - 60 °C
  • Sensor
  • CO₂ sensors
SEK-STCC4
New

SEK-STCC4

Evaluation kit for CO2 sensor STCC4

The SEK-STCC4, with an integrated STCC4 on a development board, enables fast and flexible testing for various applications.  

  

Includes: 

  • 1x STCC4 development board
  • 1x adapter cable
  • 1x jumper wire set 

 

1x SEK-SensorBridge required  

  • Evaluation kit
  • CO₂ sensors
SEK-STC31-C
New

SEK-STC31-C

CO₂ evaluation kit STC31-C

- Perfectly suited for measuring high CO₂ concentrations
- Reliable sensor output over product lifetime
- Fast, automated and low-cost assembly

Includes:
- 1x STC31-C,1x SHTC3 on FPCB
- 1x RJ45 adapter cable (1 meter length)

1x SEK-SensorBridge required

  • Evaluation kit
  • CO₂ sensors
SEK-SCD43
New

SEK-SCD43

Evaluation kit for SCD43 CO2 sensors

The SEK-SCD43, with a SCD43 integrated on a development board, enables fast testing of the SCD43 for different applications.

 

Includes:

  • 1x SCD43 development board
  • 1x adapter cable
  • 1x jumper wire set

SEK-SensorBridge required

  • Evaluation kit
  • CO₂ sensors
SEN66
New

SEN66

Sensing platform for PM, RH/T, VOC, NOx and CO2 measurements

Mass concentration precision
±10 %
Mass concentration range
0 - 1000 μg/m³
Particle size range
PM1.0, PM2.5, PM4 and PM10
Lifetime
> 10 years
Supply voltage
3.15 - 3.45 V
Average supply current
90000 uA
Interfaces
I²C
  • Sensor
  • Particulate matter sensors
SEN63C
New

SEN63C

Sensing platform for PM, RH/T and CO2 measurements

Mass concentration precision
±10 %
Mass concentration range
0 - 1000 μg/m³
Particle size range
PM1.0, PM2.5, PM4 and PM10
Lifetime
> 10 years
Supply voltage
3.15 - 3.45 V
Average supply current
80000 uA
Interfaces
I²C
  • Sensor
  • Particulate matter sensors
SEK-SEN66
New

SEK-SEN66

Evaluation kit SEN60, SEN65, SEN66

  • All-in-one air quality sensor module
  • RH/T, PM (1, 2.5, 4, 10), VOC and NOx, CO2 outputs
  • On-board algorithms

 

Includes:

  • 1x SEN66
  • 1x adapter cable
  • 1x jumper wire set
  • 1x adapter cabel Qwiic

1x SEK-SensorBridge required

  • Evaluation kit
  • Particulate matter sensors
SEK-SEN63C
New

SEK-SEN63C

Evaluation kit SEN63C

  • All-in-one air quality sensor module
  • RH/T, PM (1, 2.5, 4, 10) and CO2 outputs
  • On-board algorithms

 

Includes:

  • 1x SEN63C
  • 1x adapter cable
  • 1x jumper wire set
  • 1x adapter cabel Qwiic

1x SEK-SensorBridge required

  • Evaluation kit
  • Particulate matter sensors
SCD41

SCD41

Improved CO₂ accuracy with extended measurement range and single-shot mode

Specified CO₂ Measurement Range
400 - 5000 ppm
Size (LxWxH)
10.1 x 10.1 x 6.5 mm
Accuracy
±50.0 ppm ±2.5 %m.v.
Response time(τ63%)
60 s
Supply voltage
2.4 - 5.5 V
Average supply current
15 mA
Operating temperature range [°C]
-10 - 60 °C
  • Sensor
  • CO₂ sensors
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