MQ-7B Semiconductor Sensor for Carbon Monoxide

For residential and industrial CO leakage detection.

Applications :

*CO alarm
*Portable co detector

Product Advantages:
  • *Low cost
  • *10 years lifetime
  • *Fast response time
  • *Simple drive circuit
Product Description:

Sensitive material of MQ-7B gas sensor is SnO2, which with lower conductivity in clean air. It make detection by method of cycle high and low temperature, and detect CO at low temperature (heated by 1.5V).The sensor’s conductivity gets higher along with the CO gas concentration rising. At high temperature (heated by 5.0V),it cleans the other gases adsorbed at low temperature. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit.

Technical Parameters:
Model MQ-7B
Sensor Type Semiconductor
Standard Encapsulation Plastic cap
Target Gas carbon monoxide
Detection range 10~500ppm CO
Standard Circuit Conditions Loop Voltage Vc ≤24V 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 60 S±1S (High temp.)
90 S±1S (Low temp.)
Load Resistance RL Adjustable
Sensor character under standard test conditions Heater Resistance RH 29Ω±3Ω (room temp.)
Heater consumption PH ≤900mW
Sensitivity S Rs(in air)/Rs(in 150ppm CO)≥5
Output Voltage Vs 2.5V~4.3V (in 150ppm CO)
Concentration Slope α ≤0.6(R300ppm/R50ppm CO)
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 Not less than 48 hours
O2 content 21%(not less than 18%)
O2 concentration effects initial value, sensitivity and repeatability.
Preheat time Over 48 hours
Lifespan 10 years
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