MQ-7 MQ7 CO Carbon Monoxide Gas Sensor Carbon Monoxide Detection Sensor Gas Sensor -51529

• Product model: MQ-7

• Product type : Semiconductor gas sensor

• Detection gas: carbon monoxide

• Detection concentration: 10-1000ppmCO

• Loop voltage: le10V DC

• Heating voltage (VH): 5.0V plusmn 0.2V ACorDC (high)

• 1.5V plusmn 0.1VACorDC (low)

• Heating time (TL): 60plusmn1S (high) 90plusmn1S (low)

• Load resistance (RL): adjustable

• Heating resistance (RH): 31Omega plusmn 3Omega (room temperature)

• Heating power consumption (PH): le350mW

• Sensitive surface resistance (Rs): 2KOmega-20KOmega (in100ppmCO)

• Sensitivity (S); Rs (in air) / Rs (100ppmCO) ge 5

• Concentration slope (alpha): le 0.6 (R300ppm/R100ppmCO)

• Temperature, humidity: 20 deg C plusmn 2 deg C; 65% plusmn 5% RH

• Standard test circuit: Vc: 5.0V plusmn 0.1V; VH (high): 5.0V plusmn 0.1V; VH (low): 1.5V plusmn 0.1V

• Warm-up time: no less than 48 hours

MQ-7B Sensor

Product Details:
The gas-sensitive material used in the MQ-7B carbon monoxide gas sensor is tin dioxide (SnO2) with low conductivity in clean air. The high and low temperature cycle detection method is used to detect carbon monoxide at low temperature (1.5V heating), the conductivity of the sensor increases with the increase of the carbon monoxide gas concentration in the air, and the high temperature (5.0V heating) cleans the stray gas adsorbed at low temperature. Use a simple circuit to convert the change in conductivity into an output signal corresponding to the gas concentration.
The MQ-7B carbon monoxide gas sensor has high sensitivity to carbon monoxide. This sensor can detect a variety of carbon monoxide-containing gases and is a low-cost sensor suitable for various applications.

Features:
Good sensitivity to carbon monoxide gas
Long life, low cost
Simple drive circuit

Application:
Household gas leak alarm
Industrial carbon monoxide gas alarm
Portable gas detector

Product parameters:
Product model: MQ-7B carbon monoxide sensor
Product Type: Semiconductor gas sensor
Detection gas: carbon monoxide
Detection concentration: 10-500ppm CO
Circuit voltage Vc: ≤24V DC
Heating voltage VH: 5.0V±0.1V ACorDC (high temperature) 1.5V±0.1V ACorDC (low temperature)
Heating time TL: 60±1S (high temperature) 90±1S (low temperature)
Load resistance RL: adjustable
Heating resistance RH: 29Ω±3Ω (room temperature)
Heating power consumption PH: ≤900mW
Output voltage Rs: 2.5V~4.3V (in150ppmCO)
Sensitivity S: Rs(in air)/Rs(150ppmCO)≥5
Concentration slope α: ≤0.6(R300ppm/R50ppm CO)
Temperature and humidity: 20℃±2℃; 65%±5%RH
Standard test circuit: Vc: 5.0V±0.1V; VH (high temperature): 5.0V±0.1V; VH (low temperature): 1.5V±0.1V
Warm-up time: no less than 48 hours
Oxygen content: 21% (not less than 18%, oxygen concentration will affect the initial value, sensitivity and repeatability of the sensor, please consult when using it under low oxygen concentration).