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MQ135B Air Pollution Detection Sensor
MQ135B Air Pollution Detection Sensor
Product details
product details
The gas sensing material used in MQ135B air pollution gas sensor is tin dioxide (SnO2) with low conductivity in clean air. When there is pollutant gas in the environment where the gas sensor is located, the conductivity of the sensor increases with the increase of pollutant gas concentration in the air. The change in conductivity can be converted into an output signal corresponding to the gas concentration using a simple circuit.
The MQ135B air pollution gas sensor has high sensitivity to ammonia, sulfides, and benzene based vapors, and is also ideal for monitoring smoke and other harmful gases. This sensor can detect various harmful gases and is a low-cost sensor suitable for multiple applications.
Sensor characteristics
Highly sensitive to atmospheres such as ammonia, sulfides, and benzene, with long lifespan, low cost, and a simple driving circuit
Main applications
Household air pollution alarm, industrial air pollution alarm, portable air pollution detector
TECHNICAL INDEX
| PRODUCT MODEL | MQ135B Air Pollution Sensor | ||
| product type | semiconductor gas sensor | ||
| Standard packaging | Plastic sealing | ||
| Detect gas | Ammonia, sulfides, and benzene based vapors | ||
| Detect concentration | 10-1000ppm (ammonia, toluene, hydrogen, smoke) | ||
| Standard circuit conditions | loop voltage | Vc | ≤24V DC |
| heating voltage | VH | 5.0V±0.1V ACorDC | |
| load resistance | RL | adjustable | |
| Characteristics of gas sensing components under standard testing conditions | heating resistor | RH | 29 Ω± 3 Ω (room temperature) |
| Heating power consumption | PH | ≤900mW | |
| Output voltage | Rs | 2.0V~4.0V(in 400ppm H2) | |
| sensitivity | S | Rs(in air)/Rs(400ppm H2)≥5 | |
| Concentration slope | α | ≤0.6(R400ppm/R100ppmH2) | |
| Standard testing conditions | Temperature and humidity | 20℃±2℃； 55%±5%RH | |
| Standard Test Circuit | Vc:5.0V±0.1V； VH: 5.0V±0.1V |
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| Warm-up time | Not less than 48 hours | ||
| oxygen content | 21% (not less than 18%, oxygen concentration will affect the initial value, sensitivity, and repeatability of the sensor. Please consult for use at low oxygen concentrations) | ||
| lifetime | 5 years | ||
Note: Output voltage (Vs) refers to V in the test atmosphereRL
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