Keyestudio MQ-7 Carbon Monoxide CO Gas Sensor Detection Module for Arduino Sensor Starter DIY Electronic Project

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is_customized: Yes
Theory: Gas Sensor
Model Number: MQ-7
Material: Mixture
Type: Gas Sensor
Output: Analog Sensor
Brand Name: keyestudio
Origin: Mainland China
Use: Gas Sensor
Product number: KS0045

The gas sensitive material used in MQ-7 gas sensor is SnO2, which is of lower electrical conductivity in clean air. It detects carbon monoxide with low temperature (heated by 1.5V) through high-low temperature cycles. The electrical conductivity of the sensor increases with the increase of the carbon monoxide concentration in the air. The change of electrical conductivity can be converted to the output signal corresponding to that of the gas concentration by using a simple circuit.

The sensitivity of MQ-7 gas sensor to carbon monoxide is quite high, so it can be used to detect various gas containing carbon monoxide. It is a low-cost sensor suitable for a variety of applications.

Feature

good sensitivity to carbon monoxide.
long service life, low cost
simple drive circuit

Application

household gas leak alarm
Industrial-level carbon monoxide gas alarm
Portable gas detector

Specification

Target gas: carbon monoxide
Detectable concentration: 300-10000ppm CO
Loop voltage Vc ≤10V DC
Heating voltage VH 5.0V±0.2V ACorDC(hight); 1.5V±0.1V ACorDC(low)
Load resistance RL adjustable
Heating resistance RH 31Ω±3Ω(Room temperature)
Heating power PH ≤350mW
Surface resistance of sensitive material Rs 2KΩ-20KΩ(in100ppmCO)
Sensitivity S Rs(in air)/Rs(100ppmCO)≥5
Concentration slope: α ≤0.6(R300ppm/R100ppm CO)
Temperature, humidity: 20±2;65%±5%RH
Standard test circuit: Vc:5.0V±0.1V;VH(high): 5.0V±0.1V;VH(low): 1.5V±0.1V

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