Description
Specifications
| Accuracy | ‘0% to 0.2% volume +/-0.02% |
| Resolution | ‘0.001% volume in air |
| Measurement Range | 0% to 5% CO2 volume in air |
| Temperature Range | 14˚F to 155˚F (-10˚C to 50˚C) |
| Humidity Range | 0-95% RH |
| Supply Voltage | 4.5-5.5 VDC |
| Supply Current | <50mA |
| Communication Interfaces | UART & I2C |
| Dimensions | 33.5 x 22 x 13.1mm |
| Weight | 7g |
| Life Expectancy | >10 years |
Operating Principle
Dual Source Non-Dispersive Infrared (NDIR) Sensors
NDIR sensors leverage Lambert-Beer’s law that states certain gasses exhibit absorption characteristics at a specific infrared wavelength.
Dual IR Source NDIR sensors use an two infrared light sources and a single IR detectors that is “tuned” to the specific wavelength for the target gas. The IR light source #1 is passed through an optical bench that “folds” the light within the optical bench to create a long optical path length – providing high accuracy and resolution when measuring the target gas. The IR light source #2 has a very short optical path length and can be used as a reference to overall light intensity of both light sources.
As the target gas concentration increases, the amount of received IR light at the IR detector decreases, this relationship is converted to a PPM measurement within the sensor.
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