K33 ELG is suitable for low power applications since the unit can be put into sleep-mode between measurements. The sensor measures and stores records of environmental parameters such as CO2, RH, and temperature.

  • Low-power consumption
  • CO2, RH, and temperature
  • Maintenance-free
  • Long term stability



K33 ELG is a sensor module for measuring CO2 concentration, temperature, and relative humidity.

ELG is designed for low-power application with demand for multiple measurement parameters. The adjustable measurement interval results in average current that can be reduced to less than 52 μA (one measurement every 60 minutes). 

As all other sensors from Senseair, the module 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 UART digital interface



This platform is designed to be a low power OEM module for integration into host apparatus, such as battery operated products and sensors with radio transmitters - any application where it is important to keep power consumption at a minimum without sacrificing the performance.

Art. No


Measured gas

Carbon dioxide (CO2)

Operating principle

Non-dispersive infrared (NDIR)

Measurement range


Measurement range °C


Measurement range RH



± 30ppm ±3% of measured value


57.15 x 50.80 x 11.80 (L x W x H)

Life expectancy

>10 years

Operation temperature range


Operation humidity range

0-95%RH (non-condensing)

Power supply

G+ referred to G0

Vbat+ referred to G0


Max rating: 5.5-12VDC

Max rating: 4.75-12VDC

Average current

<52μA with 60 minutes measurement period

Peak current



I2C, UART (ModBus)

No product variations available. However, you can always contact our sales team to help you find a product or make adaptions that meet your needs.

Product Product number

SADK (Senseair Development Kit)