Sunlight R290

Electronics with no moving parts makes Senseair Sunlight R290 robust and resistant to vibrations. Any application with a tough environment or in environments with explosion risk is benefited by the solid-state design. It is also the first NDIR sensor with LED technology that truly saves power while maintaining a high precision.


Senseair Sunlight Propane 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 (Modbus) and I2 C interface. With the ABCfunction activated, the sensor is maintenance- free.


Senseair Sunlight Propane is a module that is designed for simple integration into products. Senseair Sunlight Propane can be used in a wide range of refrigerant applications based on R290.

  • Complies with
    • IEC 60079-29-1
  • Complies with sensor element part at
    • IEC and UL 60335-2-40
  • Miniature size
  • Fast response time
  • Maintenance-free
  • Long term stability
  • Long lifetime
  • Immunity to poisoning
  • Individually calibrated
  • Very low power consumption
  • Mass production

We at Senseair believe in quality and accuracy. When it comes to gas measurements, you want a sensor that you can always trust - without the need for maintenance. Equipped with a self-correcting algorithm (ABC: Automatic Baseline Correction), you can mount your Sunlight sensor and then leave it alone for 15 years while maintaining a robust system. Our Sunlight sensors are optimized for battery and wireless applications, or in places where you need a reliable and secure sensor with a long life. 

Senseair’s Sunlight R290 can be used in a wide range of refrigerant applications. Using LED as the light source and a photodiode in the sensor section ensures highly safe operation of equipment that uses a mildly flammable refrigerant (R290). 


Measured gas R290, Propane (C3 H8 ) 1
Operating principle Non-dispersive infrared (NDIR)
Operating range* -40–70 °C, 0–95% RH (non-condensing)
Measurement range 0–100% LFL
Resolution 1 ppm

Standard range: ±2.5% LFL 2, 3, 4

Extended range: ±5% LFL 2, 3, 4

Measurement setting Continuous measurement mode, 2 s, 8 samples
Maintenance Periodic Zero calibration or ABC Calibration5
Power supply 3.05-5.5 V DC 6
Dimensions 34 x 21 x 12 mm, max
Life expectancy 15 years in normal commercial environments
Storage temperature -40 – 85°C
Communication interface UART, I2C


Note 1: The sensor can measure molecules containing C-H bonds.

Note 2: Standard range 0 – 25% LFL, Extended range 25 – 50% LFL.

Note 3: -30 – 60 °C, 0 – 95% RH, after 3 ABC periods or 1 zero calibration and default measurements settings.

Note 4: Accuracy is specified over temperature range. Specification is referenced to cer- tified calibration mixtures. Some industrial applications do require maintenance. Contact Senseair for further information.

Note 5: Default mode: ABC ON, ABC period 720 h (30 days).

Note 6: Unprotected against surges and reverse power supply polarity

* Might be changed without notice.


Product number

Senseair Sunlight R290


Senseair Sunlight R32


Senseair Sunlight CO2




Product number

Sunrise & Sunlight Evaluation Kit 00-0-0108

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