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MQ138 |
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| Part Number | MQ138 |
| Manufacturer | Hanwei |
| Description | MQ138 Semiconductor Sensor for Organic Steam Sensitive material of MQ138 gas sensor is SnO2, which with lower conductivity in clean air. When the target Organic Steam exist, The sensor’s conductivity... |
| Features |
Bakelite)
Detection Gas
Toluene, Acetone, Ethanol, H2
Concentration
5-500ppm
Circuit
Loop Voltage Heater Voltage
Load Resistance
Vc VH
RL
≤24V DC 5.0V±0.2V AC or DC
Adjustable
Heater Resistance
RH
31Ω±3Ω（Room Tem.）
Character
Heater consumption
Sensing Resistance
PH ≤900mW Rs 2KΩ-20KΩ(in 50ppm Toluene )
Sensitivity S Rs(in air)/Rs(50ppm Toluene)≥3
Slope
α ≤0.6≤0.6(R100ppm/R50ppm Toluene)
Tem. Humidity
20℃±2℃；65%±5%RH
Condition Standard test circuit
Vc: 5.0V±0.1V； VH: 5.0V±0.1V
Preheat time
Over 48 hours
Power of Sensitivity body(Ps): Ps=Vc2×Rs/(Rs+RL)2
RL VH
GND
The ab... |
| Document |
 MQ138 Data Sheet
PDF 161.26KB |
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