Semiconductor Sensor for Organic Steam
Good sensitivity&selectivity to Organic Steam
Stable performance with favorable price
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 is more higher along with the gas concentration rising. Please use simple electrocircuit, Convert change of conductivity to correspond output signal of gas concentration.
MQ138 gas sensor has high sensitity to Toluene, Acetone, Ethanol and Formaldehyde, also to other organic steam. The sensor could be used to detect different organic steam, it is with low cost and suitable for different application.
Character
* Good sensitivity to Organic Steam
* High sensitivity to Toluene, Acetone and Ethanol
* Long life and low cost
* Simple drive circuit
Application
* Domestic Organic steam detector
* Industrial Organic steam detector
* Portable gas detector
Model No. | MQ138 | ||
Sensor Type | Semiconductor | ||
Standard Encapsulation | Bakelite (Black Bakelite) | ||
Detection Gas | Toluene, Acetone, Ethanol, H2 | ||
Concentration | 5-500ppm | ||
Circuit | Loop Voltage | Vc | ≤24V DC |
Heater Voltage | VH | 5.0V±0.2V AC or DC | |
Load Resistance | RL | Adjustable | |
Character | Heater Resistance | RH | 31Ω±3Ω(Room Tem.) |
Heater consumption | PH | ≤900mW | |
Sensing Resistance | Rs | 2KΩ-20KΩ(in 50ppm Toluene ) | |
Sensitivity | S | Rs(in air)/Rs(50ppm Toluene)≥3 | |
Slope | α | ≤0.6≤0.6(R100ppm/R50ppm Toluene) | |
Condition | Tem. Humidity | 20°C±2°C 65%±5%RH | |
Standard test circuit | Vc: 5.0V±0.1V VH: 5.0V±0.1V | ||
Preheat time | Over 48 hours |