Compared with traditional principle gas sensors, gas sensors based on the infrared absorption principle have advantages such as good stability, strong selectivity, no dependence on oxygen, wide detection range, long lifespan, long maintenance cycles, and strong anti-interference capability. They represent the trend in gas detection development and can quickly replace traditional principle gas sensors. The XSIR-4CO2-FS infrared gas sensor is designed with the latest technology, using a low-power processor and an infrared light source to control overall power consumption, while maintaining a constant operating current for the sensor to ensure that the power circuit is not affected by current surges, making the sensor work more stably. The XSIR-4CO2-FS sensor adopts a newly designed algorithm, including gas concentration algorithm, calibration algorithm, and temperature compensation algorithm. The sensor uses a 32-bit core industrial-grade microprocessor with fast computation speed and a wide operating temperature range. Combined with the latest algorithms, the sensor can ensure high efficiency, high accuracy, stable and reliable data computation, and adapt to different working environments.