ShenzhenYijiajie Electronic Co., Ltd.
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MQ131 Ozone Semiconductor - type Gas Sensor For Domestic Ozone Concentration Alarms
Sensitive Material:
The sensitive material of the MQ131 gas sensor is WO₃, which has lower conductivity in clean air. When ozone gas is present, the sensor's conductivity decreases as the gas concentration increases.
Features
Working Principle:
Users can convert the change of conductivity into an output signal corresponding to the gas concentration through a simple circuit. The sensor is also sensitive to strong oxidizing gases such as Cl₂ and NO₂, and reacts in the opposite direction to organic interference gases compared with ozone.
Application Fields:
It is widely used in domestic ozone concentration alarms, industrial ozone concentration alarms, and portable ozone concentration detectors.
| Parameter | Symbol | Value | Unit | Remarks |
|---|---|---|---|---|
| Loop Voltage | Vc | 5 ± 0.1 | V | AC or DC |
| Heater Voltage | Vh | 5 ± 0.1 | V | AC or DC |
| Load Resistance | RL | Adjustable | - | - |
| Heater Resistance | Rh | 34 ± 3 | Ω | Room temperature |
| Heater Power Consumption | Ph | ≤ 900 | mW | - |
| Detection Range | - | 10 - 1000 | ppb | Ozone |
| Sensitivity | S | Rs (in air)/Rs (in 200 ppb O₃) ≥ 2 | - | - |
| Output Voltage | △Vs | ≥ 1.0 | V | In 200 ppb O₃ |
| Concentration Slope | α | ≤ 0.6 | - | R₅₀₀ ppb/R₁₀₀ ppb O₃ |
| Operating Temperature | Tao | -20 - 50 | ℃ | - |
| Storage Temperature | Tas | -20 - 70 | ℃ | - |
| Relative Humidity | RH | ≤ 95 | % | - |
| Pre - heat Time | - | ≥ 48 | h | - |
| Standard Test Temperature | - | 20 ± 2 | ℃ | - |
| Standard Test Humidity | - | 55 ± 5 | % | - |
| Oxygen Content | - | ≥ 18 | % | 21% is optimal, which will affect the initial value, sensitivity and repeatability of the sensor |
