Overview
Sensitive material of MQ131 gas sensor is a semiconductor metal oxide with high conductivity in clean air. When the ozone gas exists, the sensor’s conductivity gets lower along with the gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit.
MQ131 ozone gas sensor has high sensitivity to ozone, and also has sensitivity to strong oxide gases, such as Cl2, NO2 etc. It responses oppositely to organic interference gases, compared with O3.
Key Features
It has good sensitivity to ozone in wide range, and has advantages such as long lifespan, low cost and simple drive circuit &etc.
Applications
It is widely used in domestic ozone concentration alarm, industrial ozone concentration alarm and portable ozone concentration detector.
Technical Specifications
| Model | MQ131 | ||
| Sensor Type | Semiconductor | ||
| Standard Encapsulation | Plastic cap | ||
| Target Gas | Ozone | ||
| Detection range | 10~1000ppb Ozone | ||
| Standard Circuit Conditions | Loop Voltage | Vc | 5.0V±0.1V DC |
| Heater Voltage | VH | 5.0V±0.1V AC or DC | |
| Load resistance | RL | Adjustable | |
| Sensor character under standard test conditions | Heater Resistance | RH | 35Ω±3Ω (room temp.) |
| Heater consumption | PH | ≤800mW | |
| Sensitivity | S | Rs(in 200ppb O3)/Rs(in air)≥2 | |
| Output Voltage | △Vs | ≥1.0V(in 200ppb O3) | |
| Concentration Slope | α | ≤0.6(R100ppb/R500ppbO3) | |
| Standard test conditions | Temp. Humidity | 20°C±2°C;55%±5%RH | |
| Standard test circuit | Vc:5.0V±0.1V; VH: 5.0V±0.1V | ||
| Preheat time | Over 48 hours | ||
| Oxygen content | 21% (not less than 18%, (oxygen concentration will affect the initial value, sensitivity and repeatability of the sensor, please consult when using it under low oxygen concentration) | ||
| Life span | 5 years |
