CO₂ sensor for installation in the ventilation duct.

Defining attributes

  • Maintenance free in normal applications
  • Contributes to lower energy costs when it is applied in a Demand Control Ventilation (DCV) strategy
  • Internal automatic self-diagnostics
  • 2 analogue outputs as standard (V/mA). Relay output as an option
  • Cost-efficient RS485 communication as an option
  • Internal 2-channel logger as an option

aSENSE Duct is a maintenance free, infrared carbon dioxide sensor for installation in the ventilation duct. The unit has an industrial housing (protection class IP65) with a duct probe. The product is designed to control ventilation by transmitting the measured carbon dioxide and temperature value to the system´s Master or DDC. The transmitter is flexible and suits many different ventilation strategies.

According to most building regulations, the fresh airflow should be at least 7 litres/second and person in rooms where people stay more than occasionally. If the room occupants are adults with a light work-load and the outdoor CO₂ concentration is 350 ppm, this airflow answers directly to an indoor CO₂ concentration of 1,040 ppm.

According to the National Boards of Occupational Safety and Health, the CO₂ concentration can be used as an indicator of the Indoor Air Quality (IAQ). A CO₂ concentration below 1,000 ppm should always be the aim.

Article number 045-8-0019
Operating principle Non-dispersive infrared (NDIR)
Measured gas CO₂
Measurement range 0 - 10,000 ppm
Accuracy ±30ppm ±3% of reading
Operating range RH <85 % RH
Operation range °C <50 °C
Warm-up time ≤1 min
Response time <3 min
Power supply 24 V AC
Peak current
Average current TBA
Communication Modbus protocol, UART
Outputs 2x Analogue
Maintenance Maintenance free
Life expectancy >15 years
Dimensions 152 x 85 x 47 mm (L x W x H)
Storage conditions -40-70 °C

Disclaimer : Please refer to product specification for the complete technical details.

Article number Product Description
045-8-0019 aSENSE Duct CO₂ sensor for installation in the ventilation duct.
050-8-0009 eSENSE Duct Display CO₂ sensor for installation in the ventilation duct.