SCD40
CO2, humidity and temperature sensor
- Photoacoustic CO2 sensor technology
- Smallest form factor: 10.1 mm x 10.1 mm x 6.5 mm
- Measurement range: 0 ppm – 40,000 ppm
- Accuracy: ±(50 ppm + 5%)
- Fully calibrated and linearized output
- SMD for cost- and space-saving integration
Product Description
The SCD4x is Sensirion’s next generation miniature CO2 sensor. This sensor builds on the photoacoustic NDIR sensing principle and Sensirion’s patented PAsens® and CMOSens® technology to offer high accuracy at an unmatched price and smallest form factor. SMD assembly allows cost- effective and space-effective integration of the sensor combined with maximal freedom of design. On-chip signal compensation is realized with the build-in SHT4x humidity and temperature sensor. CO2 is a key indicator for indoor air quality as high levels compromise humans’ cognitive performance and well-being. The SCD4x enables smart ventilation systems to regulate ventilation in the most energy-efficient and human-friendly way. Moreover, indoor air quality monitors and other connected devices based on the SCD4x can help maintaining low CO2 concentration for a healthy, productive environment
CO2 Sensor Specifications
| Parameter | Conditions | Value |
|---|---|---|
| CO2 measurement range | - | 0 – 40’000 ppm |
| Accuracy | 0 ppm – 5’000 ppm | ± (50 ppm + 5% of reading) |
| Repeatability | 0 ppm – 5’000 ppm | ± 10 ppm |
| Response time | T63% | 60 s |
| Accuracy drift per year | 400 ppm – 5’000 ppm ASC field-calibration algorithm activated or FRC field-calibration function performed. |
Typical: ± (5 ppm + 0.5 % of reading) |
Humidity Sensor Specifications
| Parameter | Conditions | Value |
|---|---|---|
| Humidity measurement range | - | 0 %RH – 95 %RH |
| Accuracy | 25°C, 0 – 95 %RH | ± 5 %RH |
| Repeatability | - | ± 0.3 %RH |
| Response time | T63% | > 90 s |
| Accuracy drift | - | < 0.25 %RH / year |
Temperature Sensor Specifications
| Parameter | Conditions | Value |
|---|---|---|
| Temperature measurement range | - | - 20°C – 60°C |
| Accuracy | 0 – 50°C | ± (0.8°C + 0.023 × |(T [°C] – 25°C)|) |
| Repeatability | - | ± 0.1°C |
| Response time | T63% | > 90 s |
| Accuracy drift | - | < 0.03 °C / year |
