MQ-7 Gas Sensor

MQ-7 Gas Sensor

It is a carbon monoxide gas measurement sensor module. It is designed in a structure that can give analog and digital output.

    MQ-7 gas sensor is sensitive material used in clean air, low conductivity tin dioxide (SnO2). Detection method using low temperature cycling (1.5V heating) detect carbon monoxide, airborne sensor conductivity increases with the increase of the concentration of carbon monoxide gas, high temperature (5.0V heating) cleaning stray gas adsorption at low temperature. Using a simple circuit can be changes in the conductivity, concentration of the gas is converted to the corresponding output signal.

    MQ-7 gas sensor with high sensitivity for carbon monoxide, this sensor can detect a variety of gases containing carbon monoxide, is a low-cost sensors for a variety of applications,
 
 
Applications:
For home, carbon monoxide detection device environment. Suitable for carbon monoxide and gas detection.

Module Features:

•     Detection of concentration: 10-1000ppmCO
•     Input Voltage: DC5V
•     Power Dissipation: 150mA
•     Heater voltage: 5V±0.2V ACorDC(high), 1.5V±0.1V ACorDC(low)
•     Load resistance: adjustable
•     Heating resistor: 31±3(indoor temperature)
•     Heating dissipation: 350mW
•     Sensitive part surface resistance: 2K-20K
•     Sensitivity: Rs ( in air ) / Rs ( 100ppm CO )5
•     Concentration gradient: 0.6
•     Dual signal output (analog output, and TTL level output)  
•     Power and TTL signal output led indication
•     DO switch signal (TTL) output   0.1 - 5V
•     TTL output valid signal is low. (When the output low signal light can be directly connected microcontroller or relay module)
•     AO analog signal output 0.1 - 0.3V
•     The analog output voltage, the higher the concentration the higher the voltage.
•     The carbon monoxide detection with better sensitivity.
•     There are four screw holes for easy positioning;
•     With a long service life and reliable stability
•     High sensitivity and good selectivity for CO
•     Rapid response and recovery characteristics
•     Dimensions: 30×19×15mm

Electrical Properties:

• Input voltage: DC5V power (current): 150mA
• Digital Output: TTL digital 0 and 1 (0.1 and 5V)
• Analog Output :0.1-0 .3 V (relatively clean), the highest concentration of voltage around 4V
• Special note: The sensor is powered, needs to warm up around 20S, measured data becomes stable, the sensor fever is a normal phenomenon, because the internal heating wire, if hot is not normal.

Package Contents:

• 1 pcs  MQ-7 sensor module