Tuesday, April 29, 2014

MQ-2 Semiconductor Gas Sensor

MQ-2 Semiconductor Gas Sensor
Sensitive material of MQ-2 gas sensor is SnO2, which with lower conductivity in clean air. When the target combustible gas 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.

MQ-2 gas sensor has high sensitity to LPG, Propane and Hydrogen, also could be used to Methane and other combustible steam, it is with low cost and suitable for different application.


Character:
  • Good sensitivity to Combustible gas in wide range
  • High sensitivity to LPG, Propane and Hydrogen
  • Long life and low cost
  • Simple drive circuit

Application:
  • Domestic gas leakage detector
  • Industrial combustible gas detector
  • Portable gas detector


Technical Parameters:
Model No.
MQ-2
Sensor Type
Semiconductor
Standard Encapsulation
Bakelite (Black Bakelite)
Detection Gas
Combustible gas and smoke
Concentration
300-10000ppm
( Combustible gas)
Circuit
Loop Voltage
Vc
≤24V  DC
Heater Voltage
VH
5.0V±0.2V ACorDC
Load Resistance
RL
Adjustable
Character
Heater Resistance
RH
31Ω±3Ω(Room Tem.)
Heater consumption
PH
≤900mW
Sensing Resistance
Rs
2KΩ-20KΩ(in 2000ppm C3H8 )
Sensitivity
S
Rs(in air)/Rs(1000ppm isobutane)≥5
Slope
α
≤0.6(R5000ppm/R3000ppm CH4)
Condition
Tem.  Humidity
20℃±2℃;65%±5%RH
Standard test circuit
Vc:5.0V±0.1V;
          VH: 5.0V±0.1V
Preheat time
Over 48 hours