3Pcs MQ-7 Semiconductor For Co Gas Sensor Carbon Monoxide Sensor Ic New

 

Sensitive material of MQ-7 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 when low temperature (heated by 1.5V). The sensor’s conductivity is more higher along with the gas concentration rising. When high temperature (heated by 5.0V), it cleans the other gases adsorbed under low temperature. Please use simple electrocircuit, Convert change of conductivity to correspond output signal of gas concentration. 
 

 

Character: 
 
1. High sensitivity to Natural gas. 
 
2. Long life and low cost. 
 
3. Simple drive circuit. 
 

 

Application: 
 
1. Domestic gas leakage detector. 
 
2. Industrial CO detector. 
 
3. Portable gas detector. 
 

 

Technical Data:

Model No.

MQ-7

Sensor Type

Semiconductor

Standard Encapsulation

Plastic

Detection Gas

Carbon Monoxide

Concentration

10-10000ppm CO

Circuit

Loop Voltage

Vc

≤10V DC

Heater Voltage

VH

5.0V±0.2V ACorDC（High）

1.5V±0.1V ACorDC（Low）

Heater Time

TL

60±1S（High）90±1S（Low）

Load Resistance

RL

Adjustable

Character

Heater Resistance

RH

31Ω±3Ω（Room Tem.）

Heater consumption

PH

≤350

Sensing Resistance

Rs

2KΩ-20KΩ(in 100ppm CO )

Sensitivity

S

Rs(in air)/Rs(100ppm CO)>=5

Slope

α

≤0.6(R300ppm/R100ppm CO)

Condition

Tem. Humidity

20°C±2°C；65%±5%RH

Standard test circuit

Vc:5.0V±0.1V；

VH（High）: 5.0V±0.1V；

VH（Low）: 1.5V±0.1V

Preheat time

Over 48 hours
 
Wed, 22 Oct 2025 21:25:07 GMT 638967939076772160 2FDA780DEAB193F77F85E3A5A12A770B