eSENSE FAI (Fresh Air Indicator) is an infrared and maintenance-free CO₂ alarm for installation in areas where the carbon dioxide levels need to be monitored, such as classrooms and offices. According to various studies, adequate ventilation increases productivity and ability to learn. The product measures the CO₂ concentration in ambient air and alarms with sound and light when the levels exceed defined levels. Fits US standard J-boxes (visible red mute button on the front).

Defining attributes

  • Audible alarm
  • Mute button
  • One analogue output
  • Internal automatic self-diagnostics
  • Maintenance free in normal applications

eSENSE FAI is a cost-optimised sensor solution for climate monitoring in classrooms and offices, for example. According to many studies, adequate ventilation increases the productivity and ability to learn. It can also reduce the risk of temporary illness and downtime. By measuring CO2, you get a good indicator of when “fresh” outside air must be supplied for acceptable indoor air quality. The ventilation will then be based on actual demand. It helps you decrease the energy consumption and still have a healthy indoor climate. A CO2 concentration below 1,000 ppm should always be the target.

Article number 050-8-0057
Operating principle Non-dispersive infrared (NDIR)
Measured gas CO₂
Measurement range 0 - 3,000 ppm
Accuracy ±30 ppm ±3 % of reading
Operating range RH <95 % RH
Operation range °C <50 °C
Warm-up time ≤1 min
Response time T1/e < 10 sec. @ 30 cc/min. flow rate, < 3 min. diffusion time
Peak current
Average current <1 W
Outputs 0 to 10 V DC (CO2)
Maintenance Maintenance free
Life expectancy > 15 years
Dimensions 130 x 85 x 30 mm (L x W x H)
Storage conditions -40-70 °C (display model (Disp): -20-50 °C)
Power supply 24 V AC/DC ±20%, 50 Hz (half-wave rectifier input)

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

Article number Product Description
050-8-0061 eSENSE FAI CO₂ alarm, fits US standard J-boxes.
050-8-0057 eSENSE II FAI CO₂ alarm, fits US standard J-boxes.