Product description
MQ-135 semiconductor sensor for ammonia. Also sensitive to sulfur-containing gases, benzene vapors, and smoke. The sensitive material in the MQ-135 gas sensor is SnO₂, which has low conductivity in clean air. When the target gas is present, the sensor’s conductivity increases in proportion to the gas concentration. A simple electronic circuit can be used to convert this change in conductivity into a corresponding output signal that represents the gas concentration.
The sensor can be mounted on a suitable breakout board 41004066.
Specifications:
- High sensitivity to ammonia (NH₃) and nitrogen oxides (NOₓ)
- Also sensitive to sulfides, benzene, and other aromatic hydrocarbons
- Supply voltage: 5 V
- Detection range: 10–1000 ppm
- Power consumption: 950 mW (the sensor becomes warm during operation)
- Both digital and analog output
- Dimensions: Ø19.5 × 24 mm (with pins)
Applications:
Monitoring of smoke, vapors, and chemical gases in industrial environments and workshops. Safety-related applications for early warning of elevated levels of harmful gases, without requirements for gas selectivity. Environmental monitoring in laboratories, test environments, and research projects. Education, prototyping, and development projects in sensor technology, IoT, and environmental measurement.
Pinout:
- AO: Analog output
- DO: Digital output
- GND: Ground
- VCC: 5 V supply voltage
