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Electrochemical CO Detector Digital Sensor BM22S3221-1

US$ 12.20
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The BM22S3221-1 is an electrochemical CO (Carbon Monoxide) detector sensor, mainly used to detect carbon monoxide. When the carbon monoxide concentration exceeds the default calibration concentration, the voltage output of the alarm pin (pin 5) changes from low level to high level (default). It is easy to make a CO detector by supplying power to this sensor and monitoring the alarm output pin.

Each BM22S3221-1 has been calibrated at the factory to maintain consistent characteristics. The calibrated alarm threshold is 180ppm.

Product information

Dimension: 20 x 24 x 21 mm
Net Weight: 7.8g


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  1. Sensor type: electrochemical type
  2. Operating Voltage: 2.5V to 5.0V
  3. Operating current: < 10μA @ 3.0V
  4. UART interface, 9600 baud rate
  5. CO concentration range: 3ppm to 1000ppm
  6. Alarm threshold (factory calibration): 180ppm, 55ppm exit alarm mode (adjustable)
  7. Sensor service life: 10 years
  8. Default preheat time: 120 seconds (adjustable)
  9. Factory calibration (128ppm), good consistency
  10. Fault detection function
  11. When the CO concentration is detected to exceed the alarm threshold for five seconds, the sensor alarms.
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