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lamaPLC project: Sension SCD
The primary difference between these Sensirion sensors is the measurement technology, which directly impacts their size and power consumption. The SCD30 uses traditional NDIR (Non-Dispersive Infrared) technology, while the SCD40/41 series uses a newer, miniaturized Photoacoustic principle.
| Feature | SCD30 | SCD40 | SCD41 |
|---|---|---|---|
| Technology | NDIR (Dual-Channel) | Photoacoustic | Photoacoustic |
| Size | 35 x 23 x 7 mm | 10.1 x 10.1 x 6.5 mm | 10.1 x 10.1 x 6.5 mm |
| CO² Range | 0 – 40,000 ppm | 400 – 2,000 ppm | 400 – 5,000 ppm |
| Accuracy | ±(30 ppm + 3% MV) | ±(50 ppm + 5% MV) | ±(40 ppm + 5% MV) |
| Voltage | 3.3V – 5.5V | 2.4V – 5.5V | 2.4V – 5.5V |
| Power (avg) | ~19 mA | ~15 mA | ~0.5 mA (Low Power Mode) |
| Interface | I²C, UART, PWM | I²C | I²C |
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