MQ-9B Semiconductor Sensor for Carbon Monoxide
Household Toxic Gas Sensor
*It is widely used in domestic CO gas leakage alarm, industrial CO gas alarm and portable CO gas detector.
- *It has good sensitivity to carbon monoxide and methane in wide range, and has advantages such as long lifespan, low cost and simple drive circuit &etc.
Sensitive material of MQ-9B gas sensor is SnO2, which with lower conductivity in clean air. It detects carbon monoxide (1.5V) by method of cycle high and low temperature. At high temperature (5.0V), it can detect CO as well as clean the other gases adsorbed at low temperature. The sensor’s conductivity gets higher along with the CO and CH4 gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit.
|Standard Encapsulation||Plastic cap|
|Target Gas||Carbon Monoxide, Methane|
|Detection range||10～500ppm CO,300～10000ppm CH4|
|Standard Circuit Conditions||Loop Voltage||Vc||≤10V DC|
|Heater Voltage||VH||5.0V±0.1V AC or DC (High temp.) 1.5V±0.1V AC or DC (Low temp.)|
|Heater Time||TL||60S±1S (High temp.)；90S±1S (Low temp.)|
|Sensor character under standard test conditions||Heater Resistance||RH||29Ω±3Ω（room temp.）|
|Sensitivity||S||Rs(in air)/Rs(in 150ppm CO)≥5 Rs(in air)/Rs(in 5000ppm CH4)≥3|
|Output Voltage||Vs||2.5V ～ 4.3V (in 150ppm CO) 2.0V ～ 4.0V (in 5000ppm CH4)|
|Concentration Slope||α||≤0.6(R300ppm/R50ppm CO) ≤0.6(R5000ppm/R1000ppm CH4)|
|Standard test conditions||Tem. Humidity||20℃±2℃；55%±5%RH|
|Standard test circuit||Vc：5.0V±0.1V； VH（High temp.）：5.0V±0.1V； VH（Low temp.）：1.5V±0.1V|
|Preheat time||Over 48 hours|
|O2 content||21%（not less than 18%） O2 concentration effects initial value, sensitivity and repeatability.|
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