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รายละเอียดสินค้า:
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| อุณหภูมิการจัดเก็บ: | - 20 ℃ - 70 ℃ | อุณหภูมิการทำงาน: | - 10 ℃ - 50 ℃ |
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| ลูปแรงดันไฟฟ้า: | ≤ 24V DC | แรงดันไฟฟ้าฮีตเตอร์ (VH): | 5.0V ± 0.2V, AC หรือ DC |
| เน้น: | MQ138 semiconductor gas sensor,VOC gas alarm sensor,domestic gas sensor with warranty |
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MQ-138 MQ138 Semiconductor Gas Sensor For Domestic VOC Gas Alarms
Working Principle:
The SnO₂ sensitive material of the MQ138 gas sensor has low conductivity in clean air. When volatile organic compounds (VOCs) or other target gases are present, the sensor's conductivity increases with the rise of the gas concentration. Users can convert the change of conductivity into a corresponding output signal of gas concentration through a simple circuit.
Applications:
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Parameter |
Symbol |
Value |
Unit |
Remarks |
|---|---|---|---|---|
| Model | - | MQ138 | - | - |
| Sensor Type | - | Semiconductor | - | - |
| Standard Encapsulation | - | Bakelite, Metal cap | - | - |
| Target Gas | - | Toluene, alcohol, hydrogen | - | - |
| Detection Range | - | 5 - 500 | ppm | - |
| 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 | - | - |
| Heater Resistance | Rh | 30Ω±3Ω | - | At room temperature |
| Heater Consumption | Ph | ≤950 | mW | - |
| Sensitivity | S | Rs (in air)/Rs (50 ppm toluene)≥2 | - | - |
| Output Voltage | △Vs | ≥0.5 | V | In 50 ppm toluene |
| Concentration Slope | α | ≤0.6 | - | R₂₀₀ ppm/R₅₀ ppm toluene |
| Standard Test Temperature | - | 20℃±2℃ | - | - |
| Standard Test Humidity | - | 55%±5% | RH | - |
| Pre - heat Time | - | Over 48 | hours | - |
| Operating Temperature | - | - 20 - 50 | ℃ |
Refer to the sixth reference, which may be different from other data. For reference only |
| Storage Temperature | - | - 20 - 70 | ℃ | - |
ผู้ติดต่อ: Miss. Xu
โทร: 86+13352990255
