STC31
CO2 Sensor Based on Thermal Conductivity
- Calibrated gas concentration and temperature output
- Next level repeatability and long term stability
- Compensates for Relative Humidity with additional SHTxx sensor
Product Description
The STC31 is a chip-sized gas concentration sensor for high range, accurate CO2 measurements designed for high-volume production. The sensor is based on a revolutionized thermal conductivity measurement principle, which results in superior repeatability and long-term stability. This makes the STC31 the perfect choice for applications where reliability is key. Thermal conductivity technology has an ultra-low power consumption, even compared to low-power optical sensor. This makes it the ideal choice for battery operated applications, delivering top-performance at an absolute minimal power budget.
The STC31 features a digital I2C interface, which makes it easy to connect directly to a microprocessor. The outstanding performance of these sensors is based on Sensirion’s patented CMOSens® Technology, which combines the sensor element, signal processing and digital calibration on a small CMOS chip. The well-proven CMOS technology is perfectly suited for high-quality mass production and is the ideal choice for demanding and cost-sensitive OEM applications.
Concentration
| Parameter | Value |
|---|---|
| Calibrated for | CO2 in N2 and CO2 in air |
| Measurement range | 0 to 25 vol% or 0 to 100 vol% |
| Accuracy | 0.5 vol% + 3% measured value or 1 vol% + 3% measured value |
| Repeatability | 0.2 vol% |
| Temperature stability | 0.025 vol% / °C |
| Resolution | 16 bit |
Temperature
| Parameter | Value |
|---|---|
| Measurement range | -20 °C to 85 ° |
| Resolution | 16 bit |
| Accuracy | 0.5 °C (10 °C to 50 °C) 1.5 °C (-20 °C to 85 °C) |
| Repeatability | 0.1°C |
