MQ-7 Carbon Monoxide CO Gas Sensor Detection Module for arduino

Type:Gas Sensor
Output:Analog Sensor
Usage:Gas Sensor
is_customized:Yes
Model Number:MQ-7
Theory:Gas Sensor
Unit Type:piece
Introduction
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 31?±3?(Room temperature)
Heating power PH ?350mW
Surface resistance of sensitive material Rs 2K?-20K?(in100ppmCO)
Sensitivity S Rs(in air)/Rs(100ppmCO)?5
Concentration slope: ? ?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
Sample code:
///Arduino Sample Code
void setup()
{
Serial.begin(9600); //Set serial baud rate to 9600 bps
}
void loop()
{
int val;
val=analogRead(0);//Read Gas value from analog 0
Serial.println(val,DEC);//Print the value to serial port
delay(100);
}