FC-22-1 Harmful Gas Detector Sensor Module (10-1000 ppm)
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Prices updated: 12 Oct 2026
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About this product
Harmful gas detector module with a digital TTL switch output (DO) and an analog output (AO) from 0 to 5V that rises with gas concentration. It measures in the 10 to 1000 ppm range, runs from 5V, and has power and TTL output indicators. The compact 32 × 20 × 22 mm board has four screw holes and suits gas monitoring and alarm projects with microcontrollers or relay modules.
Specifications
- Measuring range
- 10 to 1000 ppm
- Working voltage
- 5 V
- Digital output
- DO TTL switch signal (active low)
- Analog output
- 0 to 5 V, rises with concentration
- Dimensions
- 32 x 20 x 22 mm
Frequently asked questions
How should I read the sensor output?
Use the AO pin with an analog input to measure concentration, since higher voltage means higher gas concentration. Use the DO pin for a simple threshold signal that triggers when the level is reached.
Which gases does it detect?
The listing describes it as a harmful gas detector without naming a specific gas. Check the manufacturer datasheet for sensitivity and cross-sensitivity before relying on it for safety-critical use.
