Senseair S8 Alarm 5%

Small components and advanced design for control- and alarm applications. The sensor can be integrated into a wide range of different alarm applications where you want to detect CO, such as leakage detection.

  • Miniature size
  • Easy integration
  • Individually calibrated
  • Maintenance-free
  • Long term stability


More than 25 years of experience of research and development within the field of infrared gas sensing has now brought us the smallest CO2 sensor with NDIR-technique in the world: the S8 5%. The new sensor has excellent performance, such as high accuracy and low power consumption. S8 5% is designed for high volume production with full traceability by sensor serial number on all manufacturing processes and key components. Every sensor is individually calibrated and is provided with a UART digital interface. The sensor is maintenance-free and has an estimated life time of more than 15 years.

S8 5% is a module that is designed for simple integration into products. S8 5% can be used in a wide range of applications such as in ventilation control to improve energy savings and to assure a good indoor climate. Other fields of use are personal safety and measurements to increase process yield and to increase economic value in bio-related processes.

Product Number: 


Measurement range:

0.04 to 5% volume CO2 (Note 1)

Power supply:

4.5 to 5.25V unprotected against surges and reverse connection

Alarm output (open collector):

Open > 8,500 ppm, Closed < 6,500 ppm

PWM output:

0 to 100 % duty cycle for 0 to 50,000 ppm

Operation temperature:

0 to 50°C

Dimensions (H x W x D):

8.5 x 33.5 x 20 mm


± 200 ppm ± 10% of reading


S8 Commercial

For connection by pin headers
(for ventilation control and CO2 monitoring


S8 Residential

For connection without pin headers (for ventilation control and CO2 monitoring)


S8 Residential

For connection by pin headers (for ventilation control and CO2 monitoring)


S8 2%

For connection by pin headers (for control and alarm applications)


 S8 LP

For applications where both energy consumption and accuracy are critical factors

Product Product number

SADK (Senseair Development Kit) for S8


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