The ELT Sensor S-300(LG) manual provides specifications, wiring, and calibration instructions for the NDIR CO₂ sensor module.
The S-300(LG) is a compact NDIR CO₂ sensor module with built‑in temperature compensation and long‑term stability, suitable for indoor air‑quality monitoring in homes, hospitals, warehouses, and agricultural greenhouses. It offers multiple output options such as UART, I²C, analog voltage, PWM and alarm signals.
The manual details the operating environment, electrical specifications, pin assignments, automatic (ACDL) and manual (MCDL) calibration procedures, as well as command formats for digital communication. It also includes optional accessories and version history. This manual is written in Chinese.
| Dimensions | 33 x 33 x 13.1 mm |
|---|---|
| Working temperature range | -20 °C to 50 °C (optional -10 °C to 60 °C) |
| Working humidity range | 0 % to 95 % RH (non‑condensing) |
| Detection range | 0 – 2,000 ppm (optional up to 10,000 ppm) |
| Accuracy | ±(30 ppm + 3 % of reading) |
| Response time | < 60 s |
| Pre‑heat time | < 6 s for operation, < 5 min for full accuracy |
| Input voltage | 5 V ± 5 % |
| Current consumption | Average 45 mA, peak < 380 mA |
| Output connector | 2 mm 4‑pin or 2.54 mm 13‑pin |
The sensor can measure CO₂ from 0 to 2,000 ppm, with optional ranges up to 3,000, 5,000, or 10,000 ppm.
The module offers UART, I²C, analog voltage, PWM, and an open‑collector alarm output.