MQ-7 Module Carbon Monoxide CO Gas Sensor

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Description
Main chip: LM393, MQ-7 gas sensor.
Operating voltage: DC 3-5V.
with the signal output indication.
the dual signal output (analog output, and TTL level output).
TTL output valid signal is low level, can connected to microcontroller directly.
0 ~ 5V analog output voltage, the higher concentration the higher voltage.
with high sensitivity and good selectivity for CO.
with a long service life and reliable stability.
rapid response and recovery characteristics.
size: 36mm*24mm*17mm(L * W * H)

Application:
For CO gas detect, CO detection range: 10 ~ 1000ppm.
MQ-7 Sensor Specifications:

Detecting Range: 10 to 1000ppm
Sensitivity: R in air/R in typical gas5
Response Time150s(70% Response)
Recovery Time150s(70% Response)
Heating Resistance313
Heating Vlotage5.0V0.2V/1.5V0.1V
Heating Power about 350mW
Measuring Voltage24V
Operating Condition:
Ambient Temperature-20 55
Humidity: 95%RH
Environment oxygen content: 21%
Storage Condition:
Temperature: -20 to 70
Humidity: 70%RH

Package include:
1 x MQ-7 Sensor Module

datasheet:
https://www.sparkfun.com/datasheets/Sensors/Biometric/MQ-7.pdf