Sensor type | Gazu |
Interfaces | UART |
BM22S3021-1 – Digital Methane (CH₄) Gas Detector Sensor
The BM22S3021-1 is a semiconductor-type digital sensor designed for the detection of methane gas (CH₄). When the gas concentration exceeds the preset alarm threshold, the output on the alarm pin (pin 5) switches from low to high, making it easy to build a gas detection system by simply powering the sensor and monitoring the alarm pin.
Each unit is factory-calibrated to ensure consistent performance, with a default alarm threshold set at 9% LEL (Lower Explosion Limit), equivalent to approximately 4500 ppm of methane.
The sensor automatically transmits its internal status via the UART interface approximately once every second, allowing a host controller to monitor real-time data without issuing commands. It also supports up to 26 control commands, enabling alarm threshold adjustment, various test operations, and restoration of factory settings.
Key Features:
Sensor type: semiconductor
Operating voltage: 5 V
Operating current: < 250 mA
UART interface, 9600 baud
Detection range: 300 ppm – 10,000 ppm (CH₄)
Alarm threshold (default): 9% LEL (~4500 ppm), user-configurable
Automatic status transmission every 1 second
Default preheat time: 180 seconds
Sensor lifespan: 5 years
Factory calibration for consistent and reliable performance
The BM22S3021-1 is a compact and efficient solution for methane detection, ideal for both residential and industrial applications requiring stable and configurable gas sensing.